JAVAGUI-计算器程序

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package 计算器;import java.awt.Window;import java.awt.*;import java.awt.event.*;import javax.swing.*; class CalculatePanel  extends JPanel{     boolean start;     String lastCommand="=";     double result;     JFrame frame=new JFrame();     JButton display;        private JPanel panel;        public CalculatePanel(){            frame.setSize(800, 600);            panel=new JPanel();            display=new JButton("0");            start=true;            display.setEnabled(false);            setLayout(new BorderLayout());            panel.setLayout(new GridLayout(4,4));            ActionListener listener=new NumAction();            ActionListener watch=new CalculateAction();            frame.add(display,BorderLayout.NORTH);            addButton("7",listener);            addButton("8",listener);            addButton("9",listener);            addButton("/",watch);            addButton("4",listener);            addButton("5",listener);            addButton("6",listener);            addButton("*",watch);            addButton("1",listener);            addButton("2",listener);            addButton("3",listener);            addButton("-",watch);            addButton("0",listener);            addButton(".",listener);            addButton("=",watch);            addButton("+",watch);            add(panel,BorderLayout.CENTER);            frame.add(panel,BorderLayout.CENTER);            frame.setTitle("计算器");            frame.setVisible(true);        }                    private void addButton(String str,ActionListener listener){            JButton button=new JButton(str);            button.addActionListener(listener);// 给按钮添加监听器            panel.add(button);//讲按钮添加到面板中        }class NumAction implements ActionListener{        public void actionPerformed(ActionEvent event) {        // TODO 自动生成的方法存根        String input=event.getActionCommand();        if(start){            display.setText("");            start=false;        }        display.setText(display.getText()+input);    }}class CalculateAction implements ActionListener{    public void actionPerformed(ActionEvent event){//实现每个ActionListener接口的类必须要实现actionPerformed()方法        String command=event.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 result=x;        display.setText(""+result);;    } }public class Test {    public static void main(String[] args) {        // TODO 自动生成的方法存根        CalculatePanel a=new CalculatePanel();    }}
javaGUI
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