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java简单小代码 java简单代码复制
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java简单代码
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
String str = "";
System.out.println("请输入指令:");
while(true){
str = sc.next();
if(str.equals("add")){
System.out.println("执行两数相加");
} else if(str.equals("sub")){
System.out.println("执行两数相减");
} else if(str.equals("help")){
System.out.println("add:两数相加 sub:两数相减");
} else {
System.out.println("请输入正确指令:");
}
}
}
你看看这段行不行
相关问答
Q1: 求编写一个超级简单的Java的程序源代码
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class ConstructFrame extends JFrame
{
private static final long serialVersionUID = 1L;
String value1="",result,value2="";
int flag=0,fix=0,sum=1;
Boolean happy;
JTextField text=new JTextField(30);
int flagsum=0;
Container c=getContentPane();
JButton buttonx;
ConstructFrame()
{ super("计算器");
c.setLayout(null);
c.setBackground(Color.blue);
this.setSize(400, 400);
c.add(text);
text.setHorizontalAlignment(JTextField.RIGHT);
final JButton buttonx=new JButton("BackSpace");
c.add(buttonx);
buttonx.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
int count=0;
String temp;
if(flag==0)
{
count=value1.length();
if(count!=1)
temp=value1.substring(0, count-1);
else
temp="0";
value1=temp;
}
else
{
count=value2.length();
if(count!=1)
temp=value2.substring(0, count-1);
else
temp="0";
value2=temp;
}
text.setText(temp);
}
});
final JButton buttony=new JButton("CE");
c.add(buttony);
buttony.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
value1="";
value2="";
flag=0;
text.setText("0");
}
});
final JButton button1=new JButton("1");
c.add(button1);
button1.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
String temp;
if(flag==0)
{
value1=value1+1;
temp=value1;
}
else
{
value2=value2+1;
temp=value2;
}
text.setText(temp);
}
});
final JButton button2=new JButton(" 2 ");
c.add(button2);
button2.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
String temp;
if(flag==0)
{
value1=value1+2;
temp=value1;
}
else
{
value2=value2+2;
temp=value2;
}
text.setText(temp);
}
});
final JButton button3=new JButton("3");
c.add(button3);
button3.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
String temp;
if(flag==0)
{
value1=value1+3;
temp=value1;
}
else
{
value2=value2+3;
temp=value2;
}
text.setText(temp);
}
});
final JButton button4=new JButton("4");
c.add(button4);
button4.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
String temp;
if(flag==0)
{
value1=value1+4;
temp=value1;
}
else
{
value2=value2+4;
temp=value2;
}
text.setText(temp);
}
});
final JButton button5=new JButton("5");
c.add(button5);
button5.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
String temp;
if(flag==0)
{
value1=value1+5;
temp=value1;
}
else
{
value2=value2+5;
temp=value2;
}
text.setText(temp);
}
});
final JButton button6=new JButton("6");
c.add(button6);
button6.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
String temp;
if(flag==0)
{
value1=value1+6;
temp=value1;
}
else
{
value2=value2+6;
temp=value2;
}
text.setText(temp);
}
});
final JButton button7=new JButton("7");
c.add(button7);
button7.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
String temp;
if(flag==0)
{
value1=value1+7;
temp=value1;
}
else
{
value2=value2+7;
temp=value2;
}
text.setText(temp);
}
});
final JButton button8=new JButton("8");
c.add(button8);
button8.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
String temp;
if(flag==0)
{
value1=value1+8;
temp=value1;
}
else
{
value2=value2+8;
temp=value2;
}
text.setText(temp);
}
});
final JButton button9=new JButton("9");
c.add(button9);
button9.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
String temp;
if(flag==0)
{
value1=value1+9;
temp=value1;
}
else
{
value2=value2+9;
temp=value2;
}
text.setText(temp);
}
});
final JButton button0=new JButton("0");
c.add(button0);
button0.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
String temp;
if(flag==0)
{
value1=value1+0;
temp=value1;
}
else
{
value2=value2+0;
temp=value2;
}
text.setText(temp);
}
});
final JButton buttonadd=new JButton(" + ");
c.add(buttonadd);
buttonadd.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
flag=1;
fix=1;
flagsum=0;
}
});
final JButton buttonsubtract=new JButton(" - ");
c.add(buttonsubtract);
buttonsubtract.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
flag=1;
fix=2;
flagsum=0;
}
});
final JButton buttoncheng=new JButton(" * ");
c.add(buttoncheng);
buttoncheng.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
flag=1;
fix=3;
flagsum=0;
}
});
final JButton buttonchu=new JButton(" / ");
c.add(buttonchu);
buttonchu.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
flag=1;
flagsum=0;
fix=4;
}
});
final JButton buttonequal=new JButton(" = ");
c.add(buttonequal);
buttonequal.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
double temp1,temp2;
double temp=0;
flagsum=0;
temp1=Double.parseDouble(value1);
temp2=Double.parseDouble(value2);
flag=0;
switch(fix)
{
case 1: temp=temp1+temp2;break;
case 2: temp=temp1-temp2;break;
case 3: temp=temp1*temp2;break;
case 4: temp=temp1/temp2;break;
}
result=Double.valueOf(temp).toString();
value1=result;
value2="";
flag=1;
text.setText(result);
}
});
final JButton buttonpoint=new JButton(".");
c.add(buttonpoint);
buttonpoint.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{ if(flagsum==0)
{
String temp;
if(flag==0 )
{
value1=value1+".";
temp=value1;
}
else
{
value2=value2+".";
temp=value2;
}
flagsum=1;
text.setText(temp);
}
}
});
JButton buttonz=new JButton("Start");
c.add(buttonz);
buttonz.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{ if(sum%2==1)
{
happy=true;
text.setText("0.");
flag=0;
}
else
{
happy=false;
value1="";
value2="";
text.setText("");
}
text.setEnabled(happy);
button1.setEnabled(happy);
button2.setEnabled(happy);
button3.setEnabled(happy);
button4.setEnabled(happy);
button5.setEnabled(happy);
button6.setEnabled(happy);
button7.setEnabled(happy);
button8.setEnabled(happy);
button9.setEnabled(happy);
button0.setEnabled(happy);
buttonx.setEnabled(happy);
buttony.setEnabled(happy);
buttonadd.setEnabled(happy);
buttonsubtract.setEnabled(happy);
buttonpoint.setEnabled(happy);
buttonequal.setEnabled(happy);
buttoncheng.setEnabled(happy);
buttonchu.setEnabled(happy);
sum++;
}
});
button1.setEnabled(false);
button2.setEnabled(false);
button3.setEnabled(false);
button4.setEnabled(false);
button5.setEnabled(false);
button6.setEnabled(false);
button7.setEnabled(false);
button8.setEnabled(false);
button9.setEnabled(false);
button0.setEnabled(false);
buttonx.setEnabled(false);
buttony.setEnabled(false);
buttonadd.setEnabled(false);
buttonsubtract.setEnabled(false);
buttonpoint.setEnabled(false);
buttonequal.setEnabled(false);
buttoncheng.setEnabled(false);
buttonchu.setEnabled(false);
text.setEnabled(false);
text.setBounds(20, 20, 200, 40);
buttonx.setBounds(20, 60,100, 40);
buttony.setBounds(140, 60,100, 40);
buttonz.setBounds(260, 60,80, 40);
button1.setBounds(20, 120,60, 40);
button2.setBounds(100, 120,60, 40);
button3.setBounds(180, 120,60, 40);
buttonadd.setBounds(260, 120,60, 40);
button4.setBounds(20, 180,60, 40);
button5.setBounds(100, 180,60, 40);
button6.setBounds(180, 180,60, 40);
buttonsubtract.setBounds(260, 180,60, 40);
button7.setBounds(20, 240,60, 40);
button8.setBounds(100, 240,60, 40);
button9.setBounds(180, 240,60, 40);
buttoncheng.setBounds(260,240,60,40);
button0.setBounds(20, 300,60, 40);
buttonpoint.setBounds(100, 300, 60, 40);
buttonequal.setBounds(180,300,60, 40);
buttonchu.setBounds(260, 300,60, 40);
setVisible(true);
}
class MYMouseEvent extends MouseAdapter
{
public void mousePressed(MouseEvent e)
{
value1=e.toString();
text.setText(value1);
}
}
}
class Calutator
{
public static void main(String[] args)
{
new ConstructFrame();
}
}
你自己慢慢的看吧！
Q2: 一段JAVA小代码
改为，你的boolean数组没有初始化，bar[0]取到的为null，if(null){} 编译通不过去
1. String foo = “blue”;
2. Boolean[] bar = {true};
3. if (bar[0]) {
4. foo = “green”;
5. }
Q3: 求写java代码，稍微简单的一个程序！
public class Car {
private String num;
private double price;
public Car(String num, double price) {
this.num = num;
this.price = price;
}
public String getNum() {
return num;
}
public double getPrice() {
return price;
}
public static void main(String[] args) {
Car aCar = new Car("京B 23456", 353698.00);
System.out.println(aCar.getNum()+ "价格java简单小代码：" + aCar.getPrice());
}
}
Q4: 几个Java小游戏代码
package reduce;
import java.applet.Applet;
import java.applet.AudioClip;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Toolkit;
import javax.sound.sampled.AudioFileFormat;
import javax.sound.sampled.AudioSystem;
import javax.swing.JFrame;
import javax.swing.JPanel;
import java.awt.Rectangle;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JOptionPane;
import javax.swing.JSlider;
import javax.swing.JLabel;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.io.File;
import java.util.Vector;
public class Frame extends JFrame implements Runnable {
JPanel contentPane;
JPanel jPanel1 = new JPanel();
JButton jButton1 = new JButton();
JSlider jSlider1 = new JSlider();
JLabel jLabel1 = new JLabel();
JButton jButton2 = new JButton();
JLabel jLabel2 = new JLabel();
int count = 1, rapidity = 80; // count 当前进行java简单小代码的个数, rapidity 游标java简单小代码的位置
int zhengque = 0, cuowu = 0;
int rush[] = { 10 ,20 ,30 }; //游戏每关的个数 可以自由添加.列 { 10 ,20 ,30 ,40,50}
int rush_count = 0; //记录关数
char list[] = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L',
'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y',
'Z', '1', '2', '3', '4', '5', '6', '7', '8', '9' }; //随机出现的数字 可以自由添加
Vector number = new Vector();
String paiduan = "true";
AudioClip Musci_anjian, Music_shibai, Music_chenggong;
public Frame() {
try {
setDefaultCloseOperation(EXIT_ON_CLOSE);
//-----------------声音文件---------------------
Musci_anjian = Applet.newAudioClip(new File("sounds//anjian.wav")
.toURL());
Music_shibai = Applet.newAudioClip(new File("sounds//shibai.wav")
.toURL());
Music_chenggong = Applet.newAudioClip(new File(
"sounds//chenggong.wav").toURL());
//---------------------------------------
jbInit();
} catch (Exception exception) {
exception.printStackTrace();
}
}
/**
* Component initialization.
*
* @throws java.lang.Exception
*/
private void jbInit() throws Exception {
contentPane = (JPanel) getContentPane();
contentPane.setLayout(null);
setSize(new Dimension(588, 530));
setTitle("Frame Title");
jPanel1.setBorder(BorderFactory.createEtchedBorder());
jPanel1.setBounds(new Rectangle(4, 4, 573, 419));
jPanel1.setLayout(null);
jButton1.setBounds(new Rectangle(277, 442, 89, 31));
jButton1.setText("开始");
jButton1.addActionListener(new Frame1_jButton1_actionAdapter(this));
jSlider1.setBounds(new Rectangle(83, 448, 164, 21));
jSlider1.setMaximum(100);
jSlider1.setMinimum(1);
jSlider1.setValue(50);
jLabel1.setText("速度");
jLabel1.setBounds(new Rectangle(35, 451, 39, 18));
jButton2.setBounds(new Rectangle(408, 442, 89, 31));
jButton2.setText("结束");
jButton2.addActionListener(new Frame1_jButton2_actionAdapter(this));
jLabel2.setText("第一关:100个");
jLabel2.setBounds(new Rectangle(414, 473, 171, 21));
contentPane.add(jPanel1);
contentPane.add(jButton2);
contentPane.add(jButton1);
contentPane.add(jSlider1);
contentPane.add(jLabel1);
contentPane.add(jLabel2);
this.addKeyListener(new MyListener());
jButton1.addKeyListener(new MyListener());
jSlider1.addKeyListener(new MyListener());
jSlider1.addChangeListener(new ChangeListener() {
public void stateChanged(ChangeEvent e) {
rapidity = jSlider1.getValue();
}
});
}
public void run() {
number.clear();
zhengque = 0;
cuowu = 0;
paiduan = "true";
while (count = rush[rush_count]) {
try {
Thread t = new Thread(new Tthread());
t.start();
count += 1;
Thread.sleep(1000 + (int) (Math.random() * 2000)); // 生产下组停顿时间
// 最快1快.最慢2秒
} catch (InterruptedException e) {
e.printStackTrace();
}
}
while (true) { // 等待最后一个字符消失
if (number.size() == 0) {
break;
}
}
if (zhengque == 0) { // 为了以后相除..如果全部正确或者错误就会出现错误. 所以..
zhengque = 1;
}
if (cuowu == 0) {
cuowu = 1;
}
if (paiduan.equals("true")) { // 判断是否是自然结束
if (zhengque / cuowu = 2) {
JOptionPane.showMessageDialog(null, "恭喜java简单小代码你过关了");
rush_count += 1; // 自动加1关
if (rush_count rush.length) {
if (rapidity 10) { // 当速度大于10的时候在-5提加速度.怕速度太快
rapidity -= 5; // 速度自动减10毫秒
jSlider1.setValue(rapidity); // 选择位置
}
Thread t = new Thread(this);
t.start();
} else {
JOptionPane.showMessageDialog(null, "牛B...java简单小代码你通关了..");
rush_count = 0;
count = 0;
}
} else {
JOptionPane.showMessageDialog(null, "请再接再励");
rush_count = 0;
count = 0;
}
} else {
rush_count = 0;
count = 0;
}
}
public void jButton1_actionPerformed(ActionEvent e) {
Thread t = new Thread(this);
t.start();
}
public void jButton2_actionPerformed(ActionEvent e) {
count = rush[rush_count] + 1;
paiduan = "flase";
}
class Tthread implements Runnable {
public void run() {
boolean fo = true;
int Y = 0, X = 0;
JLabel show = new JLabel();
show.setFont(new java.awt.Font("宋体", Font.PLAIN, 33));
jPanel1.add(show);
X = 10 + (int) (Math.random() * 400);
String parameter = list[(int) (Math.random() * list.length)] + "";
Bean bean = new Bean();
bean.setParameter(parameter);
bean.setShow(show);
number.add(bean);
show.setText(parameter);
while (fo) {
// ---------------------数字下移--------------------
show.setBounds(new Rectangle(X, Y += 2, 33, 33));
try {
Thread.sleep(rapidity);
} catch (InterruptedException e) {
e.printStackTrace();
}
if (Y = 419) {
fo = false;
for (int i = number.size() - 1; i = 0; i--) {
Bean bn = ((Bean) number.get(i));
if (parameter.equalsIgnoreCase(bn.getParameter())) {
cuowu += 1;
jLabel2.setText("正确:" + zhengque + "个,错误:" + cuowu
+ "个");
number.removeElementAt(i);
Music_shibai.play();
break;
}
}
}
}
}
}
class MyListener extends KeyAdapter {
public void keyPressed(KeyEvent e) {
String uu = e.getKeyChar() + "";
for (int i = 0; i number.size(); i++) {
Bean bean = ((Bean) number.get(i));
if (uu.equalsIgnoreCase(bean.getParameter())) {
zhengque += 1;
number.removeElementAt(i);
bean.getShow().setVisible(false);
jLabel2.setText("正确:" + zhengque + "个,错误:" + cuowu + "个");
Music_chenggong.play();
break;
}
}
Musci_anjian.play();
}
}
public static void main(String[] args) {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (Exception exception) {
exception.printStackTrace();
}
Frame frame = new Frame();
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
Dimension frameSize = frame.getSize();
if (frameSize.height screenSize.height) {
frameSize.height = screenSize.height;
}
if (frameSize.width screenSize.width) {
frameSize.width = screenSize.width;
}
frame.setLocation((screenSize.width - frameSize.width) / 2,
(screenSize.height - frameSize.height) / 2);
frame.setVisible(true);
}
}
class Frame1_jButton2_actionAdapter implements ActionListener {
private Frame adaptee;
Frame1_jButton2_actionAdapter(Frame adaptee) {
this.adaptee = adaptee;
}
public void actionPerformed(ActionEvent e) {
adaptee.jButton2_actionPerformed(e);
}
}
class Frame1_jButton1_actionAdapter implements ActionListener {
private Frame adaptee;
Frame1_jButton1_actionAdapter(Frame adaptee) {
this.adaptee = adaptee;
}
public void actionPerformed(ActionEvent e) {
adaptee.jButton1_actionPerformed(e);
}
}
class Bean {
String parameter = null;
JLabel show = null;
public JLabel getShow() {
return show;
}
public void setShow(JLabel show) {
this.show = show;
}
public String getParameter() {
return parameter;
}
public void setParameter(String parameter) {
this.parameter = parameter;
}
}
java简单小代码我只有一个打字母小游戏
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