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java文本比较源代码 java源代码的文本文件的扩展名
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求用java比较四个数大小源代码 (初学者 希望朋友给的代码是基础的那种)
package mypackage.OrderInt4;
/*求用java比较四个数大小源代码 (初学者 希望朋友给的代码是基础的那种) 老师说只要两个类 其中一个类从另一个类里调用*/
public class TestOrder {
public static void main(String[] args) {
int[] array = { 11, 77, 22, 44 };
// 也可以从控制台输出
int[] newArray = Order.orderBy(array);
for (int i = 0; i newArray.length; i++) {
System.out.println(newArray[i] + " ");
}
}
}
class Order {
public static int[] orderBy(int[] intArray) {
int tempArray[] = intArray;
int length = tempArray.length;
int tempValue = 0;
for (int i = 0; i length; i++) {
for (int j = i + 1; j length; j++) {
if (tempArray[i] tempArray[j]) {
tempValue = tempArray[i];
tempArray[i] = tempArray[j];
tempArray[j] = tempValue;
}
}
}
return tempArray;
}
}
相关问答
Q1: Java里的字节码和源代码分别啥意思,和起到什么左右
/*java是一门高级编程语言java文本比较源代码,是用来写程序代码的。
用java写的文本(字符串序列)就是源代码。
计算机不能直接执行源代码java文本比较源代码,必须用一个叫编译器的程序(javac.exe)将源代码
翻译成字节码java文本比较源代码,然后让一个叫解释器的程序(java.exe)去执行字节码,即运行程序。
下面的就是一个小程序的源代码,功能是输出九九乘法表。
下图中的Test.class就是这个源代码文件翻译后的由字节码组成的文件。
而最下面的那个黑框就是程序执行后的结果。
java Test就是在执行Test.class字节码文件,即运行这个程序。
*/
//这下面的就是源代码
public class Test {
public static void main(String[] args) {
int i,j;
for(i=1;i=9;i++) {
for(j=1;j=i;j++)
System.out.printf("%dx%d=%-4d",j,i,j*i);
System.out.println();
}
}
}
Q2: 求JAVA源代码
我用了半个小时 帮java文本比较源代码你写了一个简单的验证用户名和密码登陆问题 别辜负我的好意 下面是代码!(建好包和类 代码粘过去就能用)
实体类 包entity
-------------------------------------------------------------
package entity;
/**
* 用户实体类
* @author new
*
*/
public class Users {
private String name;//用户名
private String pass;//用户密码
/**
* 空的构造函数 用户实力化 此类对象
*/
public Users(){
}
/**
* 构造函数 接收用户名和密码
* @param name
* @param pass
*/
public Users(String name, String pass) {
this.name = name;
this.pass = pass;
}
/**
* 下面set和get方法就不用解释了吧
* @return
*/
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPass() {
return pass;
}
public void setPass(String pass) {
this.pass = pass;
}
}
数据库类 包dao(我是模拟一下数据库 没有用到数据库)
--------------------------------------------------------------
package dao;
import java.util.*;
import entity.Users;//导入实体类
/**
* 模拟数据库 用户DAO
* @author new
*
*/
public class UsersDAO {
private static Users users=new Users();
static
{
users.setName("tom");
users.setPass("jerry");
}
/**
* 根据姓名查找这个用户 (模拟一下数据库)
* @param name
* @return
*/
public Users findUserByName(String name)
{
if(name.equals(this.users.getName()))
{
return this.users;
}
return null;
}
}
业务类 包service (验证用户名和密码)
------------------------------------------------------------
package service;
import dao.UsersDAO;
import entity.Users;
/**
* 验证密码 业务类
* @author new
*
*/
public class validatePass {
//实力化DAO对象
private UsersDAO us=new UsersDAO();
/**
* 验证输入的密码是否正确
* @param name
* @param pass
* @return
*/
public Users validate(String name,String pass)
{
Users user=null;
user=us.findUserByName(name);
//如果不为空 说明查到了
if(user!=null)
{
//用查询出来对象的密码和传过来的密码比较
if(user.getPass().equals(pass))
{
return user;
}
}
return null;
}
}
最后是测试test类 包test
----------------------------------------------------------
package test;
import entity.Users;
import service.validatePass;
/**
* 测试类
* @author new
*
*/
public class test {
/**
* main方法 用于测试
* @param args
*/
public static void main(String[] args)
{
//实例化业务类对象
validatePass v=new validatePass();
//用户名和密码
String name="tom";
String pass="jerry";
//开始验证
Users user=v.validate(name, pass);
if(user==null)
{
System.out.println("你输入的用户名或密码错误!");
}else
{
System.out.println("你已经通过验证java文本比较源代码,成功登陆!");
}
}
}
Q3: 求java编写的简单协同文本编辑器源码~~~急!
package jettang;
import java.lang.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.sql.*;
//////////////////////////////////////////////
//主类
public class STU {
public STU() {
try {
jbInit();
} catch (Exception ex) {
ex.printStackTrace();
}
}
public static void main(String args[]) {
new Frm_Main();
}
private void jbInit() throws Exception {
}
}
//主框架java文本比较源代码,数据库
class Frm_Main implements ActionListener { //throws IOException
public static final int EXIT_ON_CLOSE = 0;
public JFrame frame;
public Container c;
public JMenuBar menuBar;
public JMenu mainMenu1;
public JMenu mainMenu2;
public JMenu mainMenu3;
public JMenuItem subMenu1[] = new JMenuItem[5];
public JMenuItem subMenu2[] = new JMenuItem[7];
public JMenuItem subMenu3[] = new JMenuItem[2];
JButton toolBarButton[] = new JButton[8];
public JToolBar toolBar;
//////////////////////////////////////////////
String strTip[] = {"姓名查询...", "添加信息...",
"删除...", "修改...", "修改确认...",
"添加确认...", "删除确认...", "关于产品信息:)"};
//////////////////////////////////////////////
// String id = new String();
String name = new String();
String sex = new String();
String age = new String();
String classid = new String();
String department = new String();
String call = new String();
//////////////////////////////////////////////
Connection con;
ResultSet rs;
Statement st;
// ResultSetMetaData rsmd;
// Vector columnHeads=new Vector();
// Vector rows = new Vector();
// Vector currentRow=new Vector();
///////////////////////////////////////////////
public JLabel classidL = new JLabel("班级");
public JLabel nameL = new JLabel("姓名");
public JLabel sexL = new JLabel("性别");
public JLabel ageL = new JLabel("年龄");
public JLabel departmentL = new JLabel("单位");
public JLabel callL = new JLabel("电话");
public JLabel tittleLabel = new JLabel();
//////////////////////////////////////////////
public JTextField classidT = new JTextField();
public JTextField nameT = new JTextField();
public JTextField sexT = new JTextField();
public JTextField ageT = new JTextField();
public JTextField departmentT = new JTextField();
public JTextField callT = new JTextField();
public JTextArea textT = new JTextArea();
//////////////////////////////////////////////
//////////////////////////////////////////////
public Frm_Main() {
/////////////////////////////////////////////////
frame = new JFrame("学籍管理系统V1.0");
c = frame.getContentPane();
c.setLayout(null);
menuBar = new JMenuBar();
toolBar = new JToolBar();
toolBar.setFloatable(false);
frame.setJMenuBar(menuBar);
frame.setResizable(false);
////////////////////////////////////////////////
mainMenu1 = new JMenu("管理");
String str1[] = {"添加", "删除", "查询", " ", "关闭"};
for (int i = 0; i 5; i++) {
if (i == 3) {
mainMenu1.addSeparator();
} else {
subMenu1[i] = new JMenuItem(str1[i]);
subMenu1[i].addActionListener(this);
mainMenu1.add(subMenu1[i]);
}
}
menuBar.add(mainMenu1);
/////////////////////////////////////////////////
mainMenu2 = new JMenu("*作");
String str2[] = {"查询", "添加", "删除", "修改",
"提交修改", "提交添加", "提交删除"};
for (int i = 0; i 7; i++) {
subMenu2[i] = new JMenuItem(str2[i]);
subMenu2[i].addActionListener(this);
mainMenu2.add(subMenu2[i]);
}
menuBar.add(mainMenu2);
/////////////////////////////////////////////////
mainMenu3 = new JMenu("集体查询");
String str3[] = {"按班级...", "按单位..."};
for (int i = 0; i 2; i++) {
subMenu3[i] = new JMenuItem(str3[i]);
subMenu3[i].addActionListener(this);
mainMenu3.add(subMenu3[i]);
}
menuBar.add(mainMenu3);
////////////////////////////////////////////////
String strToolBar[] = {"查询", "添加", "删除", "修改", "提交修改",
"提交添加", "提交删除", "关于"};
for (int i = 0; i 8; i++) {
toolBarButton[i] = new JButton(strToolBar[i]);
toolBarButton[i].setToolTipText(strTip[i]);
toolBarButton[i].addActionListener(this);
toolBar.add(toolBarButton[i]);
}
toolBar.setLocation(0, 0);
toolBar.setSize(400, 30);
c.add(toolBar);
////////////////////////////////////////////////
classidL.setLocation(35, 40);
classidL.setSize(40, 20);
//classidL.setFont(new Font("",Font.BOLD,12));
c.add(classidL);
classidT.setLocation(90, 40);
classidT.setSize(200, 20);
//classidT.setEnabled(false);
c.add(classidT);
nameL.setLocation(35, 70);
nameL.setSize(40, 20);
c.add(nameL);
nameT.setLocation(90, 70);
nameT.setSize(200, 20);
c.add(nameT);
sexL.setLocation(35, 100);
sexL.setSize(40, 20);
c.add(sexL);
sexT.setLocation(90, 100);
sexT.setSize(200, 20);
c.add(sexT);
ageL.setLocation(35, 130);
ageL.setSize(40, 20);
c.add(ageL);
ageT.setLocation(90, 130);
ageT.setSize(200, 20);
c.add(ageT);
departmentL.setLocation(35, 160);
departmentL.setSize(40, 20);
c.add(departmentL);
departmentT.setLocation(90, 160);
departmentT.setSize(200, 20);
c.add(departmentT);
callL.setLocation(35, 190);
callL.setSize(40, 20);
c.add(callL);
callT.setLocation(90, 190);
callT.setSize(200, 20);
c.add(callT);
/////////////////////////////////////////////////
tittleLabel.setText("----------集体查询结果--------");
tittleLabel.setSize(300, 20);
tittleLabel.setLocation(10, 210);
c.add(tittleLabel);
////////////////////////////////////////////
textT.setSize(400, 300);
textT.setLocation(10, 240);
c.add(textT, 14);
///////////////////////////////////////////////
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(500, 650);
frame.setLocation(200, 200);
frame.setVisible(true);
conDB();
}
//以上是框架设计
//JDBC
public void conDB() {
try {
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
} catch (ClassNotFoundException e) {
JOptionPane.showMessageDialog(null, "数据库错误");
}
try {
con = DriverManager.getConnection("jdbc:odbc:jettang", "sa", "");
st = con.createStatement();
} catch (SQLException e) {
JOptionPane.showMessageDialog(null, "数据库连接失败");
}
}
//关闭连接
public void closeDB() {
try {
st.close();
con.close();
} catch (SQLException e) {
JOptionPane.showMessageDialog(null, "数据库关闭失败");
}
}
//事件响应
public void actionPerformed(ActionEvent e) {
//////////////////////////////////////////////
if (e.getSource() == toolBarButton[7]) {
JOptionPane.showMessageDialog(null, "当前版本1.0java文本比较源代码,*作帮助请看使用说明书");
}
/////////////////////////////////////////////查询(按姓名)
if (e.getSource() == subMenu2[0] || e.getSource() == toolBarButton[0] ||
e.getSource() == subMenu1[2]) {
String idid = JOptionPane.showInputDialog("请输入学生姓名");
if (idid.trim() != "") {
String strSQL = "select * from stuinfo where name = + idid +
";
try {
rs = st.executeQuery(strSQL);
int count = 0;
while (rs.next()) {
classid = rs.getString("classid");
name = rs.getString("name");
department = rs.getString("department");
sex = rs.getString("sex");
age = rs.getString("age");
call = rs.getString("call");
++count;
}
if (count == 0) {
JOptionPane.showMessageDialog(null, "无此信息");
} else {
classidT.setText(classid);
nameT.setText(name);
sexT.setText(sex);
ageT.setText(age);
callT.setText(call);
departmentT.setText(department);
}
} catch (Exception ex) {
JOptionPane.showMessageDialog(null, "查询失败");
}
}
}
/////////////////////////////////////////////关闭
if (e.getSource() == subMenu1[4]) {
frame.dispose();
closeDB();
}
/////////////////////////////////////////////添加
if (e.getSource() == subMenu1[0] || e.getSource() == subMenu2[1] ||
e.getSource() == toolBarButton[1]) {
JOptionPane.showMessageDialog(null, "请输入你添加的信息再点击提交添加键");
classidT.setEnabled(true);
classidT.setText("");
nameT.setText("");
sexT.setText("");
ageT.setText("");
callT.setText("");
departmentT.setText("");
}
/////////////////////////////////////////////提交添加
if (e.getSource() == toolBarButton[5] || e.getSource() == subMenu2[5]) {
if ((classidT.getText().trim()).equals("") ||
(nameT.getText().trim()).equals("") ||
(sexT.getText().trim()).equals("") ||
(ageT.getText().trim()).equals("") ||
(callT.getText().trim()).equals("") ||
(departmentT.getText().trim()).equals("")) {
JOptionPane.showMessageDialog(null, "请先点击添加键");
} else {
classid = classidT.getText();
name = nameT.getText();
sex = sexT.getText();
age = ageT.getText();
call = callT.getText();
department = departmentT.getText();
String strSQL =
"insert into stuinfo(classid,name,sex,age,call,department) values( +
classid + , +
name + , + sex + , + age + , + call + , +
department + )";
try {
st.executeUpdate(strSQL);
} catch (Exception exx) {
JOptionPane.showMessageDialog(null, "添加失败");
return;
}
JOptionPane.showMessageDialog(null, "添加成功");
classidT.setText("");
nameT.setText("");
sexT.setText("");
ageT.setText("");
callT.setText("");
departmentT.setText("");
}
}
////////////////////////////////////////////提交修改
if (e.getSource() == subMenu2[4] || e.getSource() == toolBarButton[4]) {
if ((classidT.getText().trim()).equals("") ||
(nameT.getText().trim()).equals("") ||
(sexT.getText().trim()).equals("")
|| (ageT.getText().trim()).equals("") ||
(callT.getText().trim()).equals("") ||
(departmentT.getText().trim()).equals("")) {
JOptionPane.showMessageDialog(null, "请先点击修改键");
return;
} else {
classid = classidT.getText();
name = nameT.getText();
sex = sexT.getText();
age = ageT.getText();
call = callT.getText();
department = departmentT.getText();
String strSQL = "update stuinfo set classid= + classid +
,sex= + sex + ,age= + age + ,call= +
call + ,department= + department + " +
"where name= + name + ";
try {
st.executeUpdate(strSQL);
} catch (Exception exx) {
JOptionPane.showMessageDialog(null, "修改失败");
return;
}
JOptionPane.showMessageDialog(null, "修改成功");
classidT.setText("");
nameT.setText("");
sexT.setText("");
ageT.setText("");
callT.setText("");
departmentT.setText("");
}
}
///////////////////////////////////////////////修改
if (e.getSource() == subMenu2[3] || e.getSource() == toolBarButton[3]) {
String idid = JOptionPane.showInputDialog("请输入你要修改的学生姓名后点击提交修改键确认");
if (idid.trim() != "") {
String strSQL = "select * from stuinfo where name = + idid +
";
try {
rs = st.executeQuery(strSQL);
int count = 0;
while (rs.next()) {
classid = rs.getString("classid");
name = rs.getString("name");
department = rs.getString("department");
sex = rs.getString("sex");
age = rs.getString("age");
call = rs.getString("call");
++count;
}
if (count == 0) {
JOptionPane.showMessageDialog(null, "无此信息");
} else {
classidT.setText(classid);
nameT.setText(name);
sexT.setText(sex);
ageT.setText(age);
callT.setText(call);
departmentT.setText(department);
classidT.setEnabled(false);
}
} catch (Exception ex) {
JOptionPane.showMessageDialog(null, "修改失败");
}
}
}
/////////////////////////////////////////////////删除
if (e.getSource() == subMenu2[2] || e.getSource() == toolBarButton[2] ||
e.getSource() == subMenu1[1]) {
String idDel = JOptionPane.showInputDialog("请输入要删除的学生姓名后点击提交删除键确认");
if (idDel.trim() != "") {
String strSQL = "select * from stuinfo where name = + idDel +
";
try {
rs = st.executeQuery(strSQL);
int count = 0;
while (rs.next()) {
classid = rs.getString("classid");
name = rs.getString("name");
department = rs.getString("department");
sex = rs.getString("sex");
age = rs.getString("age");
call = rs.getString("call");
++count;
}
if (count == 0) {
JOptionPane.showMessageDialog(null, "无此信息");
} else {
classidT.setText(classid);
nameT.setText(name);
sexT.setText(sex);
ageT.setText(age);
callT.setText(call);
departmentT.setText(department);
classidT.setEnabled(false);
}
} catch (Exception ex) {
JOptionPane.showMessageDialog(null, "删除失败");
}
}
}
//////////////////////////////////////////////////提交删除
if (e.getSource() == toolBarButton[6] ||
e.getSource() == subMenu2[6]) {
if ((classidT.getText().trim()).equals("") ||
(nameT.getText().trim()).equals("") ||
(sexT.getText().trim()).equals("") ||
(ageT.getText().trim()).equals("") ||
(callT.getText().trim()).equals("") ||
(departmentT.getText().trim()).equals("")) {
JOptionPane.showMessageDialog(null, "请先点击删除键");
return;
} else {
name = nameT.getText();
String strSQL = "delete from stuinfo where name= + name +
";
try {
st.executeUpdate(strSQL);
} catch (Exception exx) {
JOptionPane.showMessageDialog(null, "删除失败");
return;
}
JOptionPane.showMessageDialog(null, "删除成功");
classidT.setText("");
nameT.setText("");
sexT.setText("");
ageT.setText("");
callT.setText("");
departmentT.setText("");
}
}
//////////////////////////////////////////////集体查询(按班级)
if (e.getSource() == subMenu3[0]) {
classidT.setText("");
nameT.setText("");
sexT.setText("");
ageT.setText("");
callT.setText("");
departmentT.setText("");
if ((classidT.getText().trim()).equals("")) {
String idclass = JOptionPane.showInputDialog("请输入班级");
String strSQL = "select * from stuinfo where classid= +
idclass +
";
try {
rs = st.executeQuery(strSQL);
displayres(rs);
} catch (Exception ex) {
JOptionPane.showMessageDialog(null, "查询失败");
}
} else {
String idclass = classidT.getText();
String strSQL = "select * from stuinfo where classid= +
idclass +
";
try {
rs = st.executeQuery(strSQL);
displayres(rs);
} catch (Exception ex) {
JOptionPane.showMessageDialog(null, "查询失败");
}
}
}
////////////////////////////按单位
if (e.getSource() == subMenu3[1]) {
classidT.setText("");
nameT.setText("");
sexT.setText("");
ageT.setText("");
callT.setText("");
departmentT.setText("");
if ((departmentT.getText().trim()).equals("")) {
String idclass = JOptionPane.showInputDialog("请输入单位");
String strSQL = "select * from stuinfo where department= +
idclass +
";
try {
rs = st.executeQuery(strSQL);
displayres(rs);
} catch (Exception ex) {
JOptionPane.showMessageDialog(null, "查询失败");
}
} else {
String idclass = departmentT.getText();
String strSQL = "select * from stuinfo where department= +
idclass +
";
try {
rs = st.executeQuery(strSQL);
displayres(rs);
} catch (Exception ex) {
JOptionPane.showMessageDialog(null, "查询失败");
}
}
}
}
public void displayres(ResultSet rs1) throws SQLException {
//定位到达第一条记录
boolean moreRecords = rs1.next();
//如果没有记录,则提示一条消息
if (!moreRecords) {
JOptionPane.showMessageDialog(null, "无此记录");
return;
}
try {
//获取数据
getNextRow(rs1);
//刷新Table
c.validate();
}
catch (SQLException sqlex) {
sqlex.printStackTrace();
}
}
public void getNextRow(ResultSet rs2) throws
SQLException {
int count = 1;
while (rs2.next()) {
name = " 姓名java文本比较源代码:" + rs2.getString(1);
age = " 年龄:" + rs2.getString(2) + " 单位:";
department = rs2.getString(3) + "
";
textT.append(count + "." + name + age + department);
count++;
}
}
}
Q4: Eclipse中如何看Java代码中系统自带的类的源代码?例如String ,Scanner等等
首先,需要下载JDK源代码(Oracle官网找或者搜一下,到处都有),一般会打成zip包做下载,下载后并不需要进行解压;
然后,可使用以下几种方式将class文件与源文件进行关联:
(1) 如果java文本比较源代码你没有进行关联过,可以在Editor中写下如下java文本比较源代码的语句:
String str = null;
然后按住Ctrl键, 用鼠标左键点击"String",
就会弹出 Class File Editor java文本比较源代码的界面让java文本比较源代码你关联源文件,
点击界面上的"Attach Source..."按钮,
在弹出的"Source Attachment Configuration"界面中,
点击"External File", 选择java文本比较源代码你下载的源文件zip包,一路OK即可;
(2) 在项目中找到 JRE System Library,定位到如下:
JRE System Library - rt.jar - java-lang-String.class
双击String.class,即弹出关联源文件的界面;
(3) 在项目中找到 JRE System Library, 定位到 rt.jar,
鼠标右键点击,在弹出的界面中选择"Properties...",
在弹出的界面中,左边默认会选中"Java Source Attachment",
在右边进行源文件的关联;
(4) Window-Preferences-Java-Installed JREs
在右边的"Installed JREs:"窗口中选中所使用的JRE,
点击其右边的"Edit",在弹出的"Edit JRE"窗口中,
有一个"JRE system libraries:"列表,
在其中找到 "...jdk1.6.0_13\jre\lib\rt.jar" 并选中,
点击右边的"Source Attachment...",
在弹出的"Source Attachment Configuration"界面中,
点击文本框右边的"External File",
选择你下载的源文件zip包,一路OK即可;
Q5: java简单记事本源代码 带解释
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
class test implements ActionListener
{
JFrame frame;
JButton b1,b2,b3,b4,b5,b6,b7,b8,b9,b10,b11,b12,b13,b14,b15,b16,b17,b18,b19,b20,b21,b22,b23,b24,b25,b26,b27,b28,b29,b30,b31;
JTextArea ta;
JPanel p1,p2,p3,p4;
JMenuBar mb;
JMenu m1,m2,m3;
JMenuItem mt1,mt2,mt3,mt4,mt5,mt6,mt7;
JRadioButton rb1,rb2;
ButtonGroup bg;
Double d1=0.0,d2=0.0,d3=0.0,d4=1.0,d5=1.0;
String s1="",s2="",s3="",s4="";
int a=0;
char c1;
int i=0;
public static void main(String[] args)
{
test that=new test();
that.go();
}
public void go()
{
frame=new JFrame("计算器");
Container cp= frame.getContentPane();
cp.setLayout(new FlowLayout());
b1=new JButton("7");b2=new JButton("8");b3=new JButton("9");b4=new JButton("/");b5=new JButton("1/x");b6=new JButton("sin");b7=new JButton("log");
b8=new JButton("4");b9=new JButton("5");b10=new JButton("6");b11=new JButton("*");b12=new JButton("x^y");b13=new JButton("cos");b14=new JButton("ln");
b15=new JButton("1");b16=new JButton("2");b17=new JButton("3");b18=new JButton("-");b19=new JButton(new ImageIcon("lanying.gif"));b20=new JButton("tan");b21=new JButton("x^3");
b22=new JButton("0");b23=new JButton("+/-");b24=new JButton(".");b25=new JButton("+");b26=new JButton("√x");b27=new JButton("cot");b28=new JButton("x^2");
b29=new JButton("Backspace");b30=new JButton("C");b31=new JButton("=");
mb=new JMenuBar();
m1=new JMenu("文件(F)");m2=new JMenu("编辑(E)");m3=new JMenu("帮助(H)");
mt1=new JMenuItem("清零");mt2=new JMenuItem("退出");mt3=new JMenuItem("复制");mt4=new JMenuItem("粘贴");mt5=new JMenuItem("版本");mt6=new JMenuItem("标准型");mt7=new JMenuItem("科学型");
ta=new JTextArea(1,30);
p1=new JPanel();p2=new JPanel();p3=new JPanel();p4=new JPanel();
rb1=new JRadioButton("科学型");rb2=new JRadioButton("标准型");
bg=new ButtonGroup();
b1.setForeground(Color.blue);b1.setBackground(Color.white);b2.setForeground(Color.blue);b2.setBackground(Color.white);
b3.setForeground(Color.blue);b3.setBackground(Color.white);b8.setForeground(Color.blue);b8.setBackground(Color.white);
b9.setForeground(Color.blue);b9.setBackground(Color.white);b10.setForeground(Color.blue);b10.setBackground(Color.white);
b15.setForeground(Color.blue);b15.setBackground(Color.white);b16.setForeground(Color.blue);b16.setBackground(Color.white);
b17.setForeground(Color.blue);b17.setBackground(Color.white);b22.setForeground(Color.blue);b22.setBackground(Color.white);
b23.setForeground(Color.blue);b23.setBackground(Color.white);b24.setForeground(Color.blue);b24.setBackground(Color.white);
b4.setForeground(Color.red);b4.setBackground(Color.white);b11.setForeground(Color.red);b11.setBackground(Color.white);
b18.setForeground(Color.red);b18.setBackground(Color.white);b25.setForeground(Color.red);b25.setBackground(Color.white);
b5.setForeground(Color.blue);b5.setBackground(Color.white);b6.setForeground(Color.blue);b6.setBackground(Color.white);
b7.setForeground(Color.blue);b7.setBackground(Color.white);b12.setForeground(Color.blue);b12.setBackground(Color.white);
b13.setForeground(Color.blue);b13.setBackground(Color.white);b14.setForeground(Color.blue);b14.setBackground(Color.white);
b19.setForeground(Color.blue);b19.setBackground(Color.white);b20.setForeground(Color.blue);b20.setBackground(Color.white);
b21.setForeground(Color.blue);b21.setBackground(Color.white);b26.setForeground(Color.blue);b26.setBackground(Color.white);
b27.setForeground(Color.blue);b27.setBackground(Color.white);b28.setForeground(Color.blue);b28.setBackground(Color.white);
b29.setForeground(Color.red);b29.setBackground(Color.white);b30.setForeground(Color.red);b30.setBackground(Color.white);
b31.setForeground(Color.red);b31.setBackground(Color.white);
bg.add(rb1);bg.add(rb2);
p1.setBackground(Color.yellow);
cp.setBackground(Color.CYAN);
m1.setMnemonic(KeyEvent.VK_F);m2.setMnemonic(KeyEvent.VK_E);m3.setMnemonic(KeyEvent.VK_H);
m1.add(mt6);m1.add(mt7);m1.addSeparator();m1.add(mt1);m1.addSeparator();m1.add(mt2);m2.add(mt3);m2.addSeparator();m2.add(mt4);m3.add(mt5);
mb.add(m1);mb.add(m2);mb.add(m3);
frame.setJMenuBar(mb);
p2.setLayout(new GridLayout(4,7));
p3.setLayout(new GridLayout(1,3));
ta.setEditable(false);
p1.add(ta);
p2.add(b1);p2.add(b2);p2.add(b3);p2.add(b4);p2.add(b5);p2.add(b6);p2.add(b7);
p2.add(b8);p2.add(b9);p2.add(b10);p2.add(b11);p2.add(b12);p2.add(b13);p2.add(b14);
p2.add(b15);p2.add(b16);p2.add(b17);p2.add(b18);p2.add(b19);p2.add(b20);p2.add(b21);
p2.add(b22);p2.add(b23);p2.add(b24);p2.add(b25);p2.add(b26);p2.add(b27);p2.add(b28);
p3.add(b29);p3.add(b30);p3.add(b31);
Border etched=BorderFactory.createEtchedBorder();
Border border=BorderFactory.createTitledBorder(etched,"计算类型");
p4.add(rb1);p4.add(rb2);
p4.setBorder(border);
b2.setActionCommand("8");
b2.addActionListener(this);
cp.add(p1);cp.add(p4);cp.add(p2);cp.add(p3);
frame.setSize(400,330);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
b1.setActionCommand("7");
b1.addActionListener(this);
b2.setActionCommand("8");
b2.addActionListener(this);
b3.setActionCommand("9");
b3.addActionListener(this);
b4.setActionCommand("/");
b4.addActionListener(this);
b5.setActionCommand("1/x");
b5.addActionListener(this);
b6.setActionCommand("sin");
b6.addActionListener(this);
b7.setActionCommand("log");
b7.addActionListener(this);
b8.setActionCommand("4");
b8.addActionListener(this);
b9.setActionCommand("5");
b9.addActionListener(this);
b10.setActionCommand("6");
b10.addActionListener(this);
b11.setActionCommand("*");
b11.addActionListener(this);
b12.setActionCommand("x^y");
b12.addActionListener(this);
b13.setActionCommand("cos");
b13.addActionListener(this);
b14.setActionCommand("ln");
b14.addActionListener(this);
b15.setActionCommand("1");
b15.addActionListener(this);
b16.setActionCommand("2");
b16.addActionListener(this);
b17.setActionCommand("3");
b17.addActionListener(this);
b18.setActionCommand("-");
b18.addActionListener(this);
b19.setActionCommand("x!");
b19.addActionListener(this);
b20.setActionCommand("tan");
b20.addActionListener(this);
b21.setActionCommand("x^3");
b21.addActionListener(this);
b22.setActionCommand("0");
b22.addActionListener(this);
b23.setActionCommand("+/-");
b23.addActionListener(this);
b24.setActionCommand(".");
b24.addActionListener(this);
b25.setActionCommand("+");
b25.addActionListener(this);
b26.setActionCommand("√x");
b26.addActionListener(this);
b27.setActionCommand("cot");
b27.addActionListener(this);
b28.setActionCommand("x^2");
b28.addActionListener(this);
b29.setActionCommand("Backspace");
b29.addActionListener(this);
b30.setActionCommand("C");
b30.addActionListener(this);
b31.setActionCommand("=");
b31.addActionListener(this);
rb1.setActionCommand("kxx");
rb1.addActionListener(this);
rb2.setActionCommand("bzx");
rb2.addActionListener(this);
}
public void actionPerformed(ActionEvent e) //throws Exception
{
if (e.getActionCommand()=="bzx")
{
b5.setEnabled(false);b6.setEnabled(false);b7.setEnabled(false);
b12.setEnabled(false);b13.setEnabled(false);b14.setEnabled(false);
b19.setEnabled(false);b20.setEnabled(false);b21.setEnabled(false);
b26.setEnabled(false);b27.setEnabled(false);b28.setEnabled(false);
}
if (e.getActionCommand()=="kxx")
{
b5.setEnabled(true);b6.setEnabled(true);b7.setEnabled(true);
b12.setEnabled(true);b13.setEnabled(true);b14.setEnabled(true);
b19.setEnabled(true);b20.setEnabled(true);b21.setEnabled(true);
b26.setEnabled(true);b27.setEnabled(true);b28.setEnabled(true);
}
if (e.getActionCommand()=="1")
{
ta.append("1");
}
if (e.getActionCommand()=="2")
{
ta.append("2");
}
if (e.getActionCommand()=="3")
{
ta.append("3");
}
if (e.getActionCommand()=="4")
{
ta.append("4");
}
if (e.getActionCommand()=="5")
{
ta.append("5");
}
if (e.getActionCommand()=="6")
{
ta.append("6");
}
if (e.getActionCommand()=="7")
{
ta.append("7");
}
if (e.getActionCommand()=="8")
{
ta.append("8");
}
if (e.getActionCommand()=="9")
{
ta.append("9");
}
if (e.getActionCommand()=="0")
{
ta.append("0");
}
if (e.getActionCommand()=="+")
{
s1=ta.getText();
d1 = Double.parseDouble(s1);
ta.setText("");
i=1;
}
if (e.getActionCommand()=="-")
{
s1=ta.getText();
d1 = Double.parseDouble(s1);
ta.setText("");
i=2;
}
if (e.getActionCommand()=="*")
{
s1=ta.getText();
d1 = Double.parseDouble(s1);
ta.setText("");
i=3;
}
if (e.getActionCommand()=="/")
{
s1=ta.getText();
d1 = Double.parseDouble(s1);
ta.setText("");
i=4;
}
if (e.getActionCommand()=="=")
{
s2=ta.getText();
d2=Double.parseDouble(s2);
if(i==1)
{
d3=d1+d2;
ta.setText( d3.toString());
}
if(i==2)
{
d3=d1-d2;
ta.setText( d3.toString());
}
if(i==3)
{
d3=d1*d2;
ta.setText( d3.toString());
}
if(i==4)
{
if(d2==0.0)
ta.setText("ERROR");
else
{
d3=d1/d2;
ta.setText( d3.toString());
}
}
if (i==5)
{
s2=ta.getText();
d2 = Double.parseDouble(s2);
for (int l=1;l=d2 ; l++)
{
d5=d5*d1;
}
ta.setText( d5.toString());
}
}
if (e.getActionCommand()=="C")
{
ta.setText("");
d4=1.0;
d5=1.0;
}
/*if (e.getActionCommand()=="Backspace")
{
s3=ta.getText();
a=s3.length();
//ta.cut(ta.select(a-1,a));
s4=ta.getText(1,3);
ta.setText(s4);
}
*/
if (e.getActionCommand()=="1/x")
{
s1=ta.getText();
d1 = Double.parseDouble(s1);
d2=1/d1;
ta.setText( d2.toString());
}
if (e.getActionCommand()==".")
{
ta.append(".");
}
if (e.getActionCommand()=="+/-")
{
s1=ta.getText();
d1 = Double.parseDouble(s1);
d2=0-d1;
ta.setText( d2.toString());
}
if (e.getActionCommand()=="x^2")
{
s1=ta.getText();
d1 = Double.parseDouble(s1);
d2=d1*d1;
ta.setText( d2.toString());
}
if (e.getActionCommand()=="x^3")
{
s1=ta.getText();
d1 = Double.parseDouble(s1);
d2=d1*d1*d1;
ta.setText( d2.toString());
}
if (e.getActionCommand()=="x^y")
{
s1=ta.getText();
d1 = Double.parseDouble(s1);
ta.setText("");
i=5;
// d2=d1*d1*d1;
// ta.setText( d2.toString());
}
if (e.getActionCommand()=="√x")
{
s1=ta.getText();
d1 = Double.parseDouble(s1);
d2=Math.sqrt(d1);
ta.setText( d2.toString());
}
if (e.getActionCommand()=="x!")
{
s1=ta.getText();
d1 = Double.parseDouble(s1);
if (d10)
{
ta.setText( "error");
}
else if (d1==0)
{
ta.setText( "0.0");
}
else {
for (int k=1;k=d1 ;k++ )
d4=d4*k;
ta.setText( d4.toString());
}
}
if (e.getActionCommand()=="sin")
{
s1=ta.getText();
d1 = Double.parseDouble(s1);
d2=Math.sin(3.1415926*d1/180);
ta.setText( d2.toString());
}
}
}
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