课程设计 学期结束java要进行课程设计 不知道做什么好 求各位大侠给个题目 不要管理系统 和网络编程和Swing 有关的就好 也不要qq 之类的 谢谢了 急急急 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 做一个计算器可以吗?代码~~import java.awt.*; import java.awt.event.*; import javax.swing.*; public class Calculator { public static void main(String args[]){ CalculatorFrame frame=new CalculatorFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.show(); } } class CalculatorFrame extends JFrame{ public CalculatorFrame(){ setTitle("计算器"); Container contentPane=getContentPane(); CalculatorPanel panel=new CalculatorPanel(); contentPane.add(panel); pack(); } } class CalculatorPanel extends JPanel{ public CalculatorPanel(){ setLayout(new BorderLayout()); result=0; lastCommand="="; start=true; display=new JLabel("0"); add(display,BorderLayout.NORTH); ActionListener insert=new InsertAction(); ActionListener command=new CommandAction(); panel=new JPanel(); panel.setLayout(new GridLayout(4,4)); addButton("7",insert); addButton("8",insert); addButton("9",insert); addButton("/",command); addButton("4",insert); addButton("5",insert); addButton("6",insert); addButton("*",command); addButton("1",insert); addButton("2",insert); addButton("3",insert); addButton("-",command); addButton("0",insert); addButton(".",insert); addButton("=",command); addButton("+",command); add(panel,BorderLayout.CENTER); } private void addButton(String label,ActionListener listener){ JButton button= new JButton(label); button.addActionListener(listener); panel.add(button); } private class InsertAction implements ActionListener{ public void actionPerformed(ActionEvent event){ String input =event.getActionCommand(); if(start){ display.setText(""); start=false; } display.setText(display.getText()+ input); } } private class CommandAction implements ActionListener{ public void actionPerformed(ActionEvent evt){ String command=evt.getActionCommand(); if(start){ if(command.equals("-")){ display.setText(command); start=false; } else lastCommand=command; } else{ calculate(Double.parseDouble(display.getText())); lastCommand =command; start=true; } } } public void calculate(double x){ if(lastCommand.equals("+")) result +=x; else if (lastCommand.equals("-")) result -=x; else if (lastCommand.equals("*")) result *=x; else if (lastCommand.equals("/")) result /=x; else if (lastCommand.equals("=")) result =x; display.setText(""+result); } private JLabel display; private JPanel panel; private double result; private String lastCommand; private boolean start; } 为什么捕捉到异常后处理出现问题呢?? java问题,求大牛们解答 笔试-JAVA-总结 怎么用JavaSpeech生成声音? 关于StringTokenizer的使用!!急!! 高分! 100分看个错误 如何取时间到毫秒级? 急!!文件可以在Linux下运行不? 截至发贴时间为止,回答《面试java程序员》一贴的,请进~! 刚过了SCJP,86,还不错吧。SUN的题库变了,都不认识了! 编译lucene包的问题? 用这个sun.net.ftp.FtpClient包能实现在FTP上创建目录的功能吗
代码~~
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Calculator {
public static void main(String args[]){
CalculatorFrame frame=new CalculatorFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.show();
}
}
class CalculatorFrame extends JFrame{
public CalculatorFrame(){
setTitle("计算器");
Container contentPane=getContentPane();
CalculatorPanel panel=new CalculatorPanel();
contentPane.add(panel);
pack();
}
}
class CalculatorPanel extends JPanel{
public CalculatorPanel(){
setLayout(new BorderLayout());
result=0;
lastCommand="=";
start=true;
display=new JLabel("0");
add(display,BorderLayout.NORTH);
ActionListener insert=new InsertAction();
ActionListener command=new CommandAction();
panel=new JPanel();
panel.setLayout(new GridLayout(4,4));
addButton("7",insert);
addButton("8",insert);
addButton("9",insert);
addButton("/",command); addButton("4",insert);
addButton("5",insert);
addButton("6",insert);
addButton("*",command); addButton("1",insert);
addButton("2",insert);
addButton("3",insert);
addButton("-",command); addButton("0",insert);
addButton(".",insert);
addButton("=",command);
addButton("+",command);
add(panel,BorderLayout.CENTER);
}
private void addButton(String label,ActionListener listener){
JButton button= new JButton(label);
button.addActionListener(listener);
panel.add(button);
}
private class InsertAction implements ActionListener{
public void actionPerformed(ActionEvent event){
String input =event.getActionCommand();
if(start){
display.setText("");
start=false;
}
display.setText(display.getText()+ input);
}
}
private class CommandAction implements ActionListener{
public void actionPerformed(ActionEvent evt){
String command=evt.getActionCommand();
if(start){
if(command.equals("-")){
display.setText(command);
start=false;
}
else
lastCommand=command;
}
else{
calculate(Double.parseDouble(display.getText()));
lastCommand =command;
start=true;
}
}
}
public void calculate(double x){
if(lastCommand.equals("+")) result +=x;
else if (lastCommand.equals("-")) result -=x;
else if (lastCommand.equals("*")) result *=x;
else if (lastCommand.equals("/")) result /=x;
else if (lastCommand.equals("=")) result =x;
display.setText(""+result);
}
private JLabel display;
private JPanel panel;
private double result;
private String lastCommand;
private boolean start;
}