简单java小程序代码 java简易小程序

如何用JAVA语言编写计算器小程序？

具体代码如下：

import javax.swing.*;

import java.awt.event.*;

import java.awt.*;

public class Calculator  extends JFrame implements ActionListener  {

private JFrame jf;

private JButton[] allButtons;

private JButton clearButton;

private JTextField jtf;

public Calculator() {

//对图形组件实例化

jf=new JFrame("任静的计算器1.0：JAVA版");

jf.addWindowListener(new WindowAdapter(){

public void windowClosing(){

System.exit(0);

}

});

allButtons=new JButton[16];

clearButton=new JButton("清除");

jtf=new JTextField(25);

jtf.setEditable(false);

String str="123+456-789*0.=/";

for(int i=0;iallButtons.length;i++){

allButtons[i]=new JButton(str.substring(i,i+1));

}

}

public void init(){

//完成布局

jf.setLayout(new BorderLayout());

JPanel northPanel=new JPanel();

JPanel centerPanel=new JPanel();

JPanel southPanel=new JPanel();

northPanel.setLayout(new FlowLayout());

centerPanel.setLayout(new GridLayout(4,4));

southPanel.setLayout(new FlowLayout());

northPanel.add(jtf);

for(int i=0;i16;i++){

centerPanel.add(allButtons[i]);

}

southPanel.add(clearButton);

jf.add(northPanel,BorderLayout.NORTH);

jf.add(centerPanel,BorderLayout.CENTER);

jf.add(southPanel,BorderLayout.SOUTH);

addEventHandler();

}

//添加事件监听

public void addEventHandler(){

jtf.addActionListener(this);

for(int i=0;iallButtons.length;i++){

allButtons[i].addActionListener(this);

}

clearButton.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e) {

// TODO Auto-generated method stub

Calculator.this.jtf.setText("");

}

});

}

//事件处理

public void actionPerformed(ActionEvent e) {

//在这里完成事件处理  使计算器可以运行

String action=e.getActionCommand();

if(action=="+"||action=="-"||action=="*"||action=="/"){

}

}

public void setFontAndColor(){

Font f=new Font("宋体",Font.BOLD,24);

jtf.setFont(f);

jtf.setBackground(new Color(0x8f,0xa0,0xfb));

for(int i=0;i16;i++){

allButtons[i].setFont(f);

allButtons[i].setForeground(Color.RED);

}

}

public void showMe(){

init();

setFontAndColor();

jf.pack();

jf.setVisible(true);

jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

public static void main(String[] args){

new Calculator().showMe();

}

}

相关问答

Q1: 用JAVA编写一个小程序，不限类型好玩点的。

控制台小游戏 class YZDEL\r\n{\r\n public static void main(String[] args)\r\n {\r\n java.util.Random Shiji = new java.util.Random();\r\n java.util.Scanner Shuru = new java.util.Scanner(System.in);\r\n java.util.Scanner Nandu = new java.util.Scanner(System.in);\r\n int YingxHP = 20;\r\n int YingxMP = 0;\r\n int MogHP = 20; \r\n int MogMP = 0;\r\n int MogDo = 0;\r\n int fangyu = 0;\r\n System.out.println("┏━━━━_┏━━┣┣┓　_　┓┏━┳━┳┓┓━┓　");\r\n System.out.println("┏┣━━━┓┏━━┣┣┓　┃┏　┃　┃┓┃　_　");\r\n System.out.println("┣┣━━━┫_━━┻__　┃_┓┃　┃_┏━┣━━┓");\r\n System.out.println("┣┣━━━┫┏━━━━┓_━━┣━┛┗━┻━┻┛┃┃");\r\n System.out.println("┏┣━━━┓┣━━━━┫　┃┃┃┗__┃┃┣━_");\r\n System.out.println("　┛┗_┗━━━━_┗___━━┛┛┗━__━┛");\r\n System.out.println();\r\n System.out.println(" 作者:天狐空幻");\r\n System.out.println();\r\n System.out.println("说明:勇者的操作方式为以下所示:");\r\n System.out.println(" 使用攻击需消耗1MP 伤害1HP");\r\n System.out.println(" 使用蓄力可增加1MP 伤害0HP");\r\n System.out.println(" 使用躲闪需消耗0MP 伤害0HP 躲避攻击");\r\n System.out.println(" 使用重击需消耗3MP 伤害2HP 防御无效");\r\n System.out.println(" 恶龙攻击力高， 注意防御是取胜的关键");\r\n System.out.println(" 恶龙MP达到4时可能会放出火焰无法躲避");\r\n System.out.println(" 准备说明完毕,那么让我们来挑战恶龙吧！");\r\n System.out.println("==================================");\r\n //难度选择\r\n System.out.println("请选择难度");\r\n System.out.println("1.娱乐 2.挑战 3.噩梦");\r\n int ND = Nandu.nextInt();\r\n System.out.println("==================================");\r\n while(true) \r\n { \r\n //HP，MP的显示 \r\n System.out.print("勇者: ");\r\n System.out.print(" HP ");\r\n for(int x=YingxHP;x0;x--) System.out.print("*"); \r\n System.out.print(" "+YingxHP);\r\n System.out.println();\r\n System.out.print(" ");\r\n System.out.print(" MP ");\r\n for(int x=YingxMP;x0;x--) System.out.print("*"); \r\n System.out.print(" "+YingxMP);\r\n System.out.println();\r\n System.out.print("恶龙: ");\r\n System.out.print(" HP ");\r\n for(int y=MogHP;y0;y--) System.out.print("*");\r\n System.out.print(" "+MogHP);\r\n System.out.println(); \r\n System.out.print(" ");\r\n System.out.print(" MP ");\r\n for(int y=MogMP;y0;y--) System.out.print("*");\r\n System.out.print(" "+MogMP);\r\n System.out.println();\r\n System.out.println("==================================");\r\n //胜利判定 \r\n if(YingxHP2MogMP2) MogDo = 2;\r\n else if(MogMP0) MogDo=2; \r\n if(Do==2MogMP==0) MogDo=0; \r\n if(Do==3MogMP=4) MogDo=3;}//变态判定。。 \r\n //战斗分析\r\n //防御 \r\n if(Do==3) {fangyu=1;System.out.println("你灵巧的躲避攻击！");}\r\n if(MogDo==1) {fangyu=1;System.out.println("恶龙进行防御！");}\r\n //角色判定 \r\n if(Do==1YingxMP==0) {System.out.println("MP不足！");}\r\n if(Do==1YingxMP0) {\r\n if(fangyu==0) {MogHP=MogHP-1;YingxMP=YingxMP-1;System.out.println("你发动攻击！");}\r\n if(fangyu==1) {YingxMP=YingxMP-1;System.out.println("你的攻击被格挡！");}} \r\n if(Do==2) {YingxMP=YingxMP+1;System.out.println("你进行蓄力！");}\r\n if(Do==4YingxMP2) {MogHP=MogHP-2;YingxMP=YingxMP-3;System.out.println("你发动重击！");}\r\n if(Do 4) System.out.println("你不知所措...");\r\n //敌人判定 \r\n if(MogDo==2MogMP==0) {System.out.println("恶龙在发呆！");}\r\n if(MogDo==2MogMP0) {\r\n if(fangyu==0) {YingxHP=YingxHP-2;MogMP=MogMP-1;System.out.println("恶龙发动攻击！");}\r\n if(fangyu==1) {MogMP=MogMP-1;System.out.println("恶龙的攻击被躲开了！");}} \r\n if(MogDo==0) {MogMP=MogMP+1;System.out.println("恶龙进行蓄力！");} \r\n if(MogDo==3MogMP3) {YingxHP=YingxHP-4;MogMP=MogMP-4;System.out.println("恶龙发动火焰吐吸！躲避不能！");} \r\n //结束 \r\n fangyu = 0;\r\n MogDo = 0;\r\n System.out.println("____________________");\r\n System.out.println();\r\n System.out.println("=================================="); }\r\n }\r\n}

Q2: java一个简单小程序，求高手帮忙编写，万分感谢

class Ball {

public void play() {

System.out.println("玩球儿...");

}

}

class Football extends Ball {

public void play() {

System.out.println("使用足球运动");

}

}

class Basketball extends Ball {

public void play() {

System.out.println("使用篮球运动");

}

}

public class TestMain {

public static void main(String[] args) {

TestMain tm = new TestMain();

tm.testPlay();

}

public void testPlay() {

Ball ball = new Football();

ball.play();

ball = new Basketball();

ball.play();

}

}

/*

D:\javac TestMain.java

D:\java TestMain

使用足球运动

使用篮球运动

*/

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