java用GUI设计简单的计算器

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1、importjavax.swing.*;importjava.awt.*;importjavax.swing.*;importjava.awt.event.*;publicclassCalculatorextendsJFrameimplementsActionListener{JPaneljpl;JTextFieldjtf;JFramec;Stringitr="";Stringf="";booleancom=false;inti=0;intsymbol=0;doublebutnum=0;JButton[]b=newJ

2、Button[20];publicstaticvoidmain(String[]args){Calculatormycalculator=newCalculator();}publicCalculator(){c=newJFrame("我的计算器");jtf=newJTextField("0",200);jpl=newJPanel();jtf.setHorizontalAlignment(JTextField.RIGHT);jtf.setPreferredSize(newDimension(0,35));jpl.se

3、tLayout(newGridLayout(5,4));String[]str={"←","CE","C","+","7","8","9","-","4","5","6","*","1","2","3","/","+/-","0",".","="};for(inti=0;i

4、dowClosing(WindowEvente){System.exit(0);}});c.add(jtf,BorderLayout.NORTH);c.add(jpl,BorderLayout.CENTER);c.setBounds(100,100,300,350);c.setVisible(true);for(inti=0;i<20;i++){b[i].addActionListener(this);}}@OverridepublicvoidactionPerformed(ActionEvente){//TODOA

5、uto-generatedmethodstubif(e.getSource()==b[4]){if(com

6、

7、i==0){jtf.setText(f+"7");com=false;i=1;}else{itr=jtf.getText();jtf.setText(itr+"7");}}elseif(e.getSource()==b[5]){if(com

8、

9、i==0){jtf.setText(f+"8");com=false;i=1;}else{itr=jtf.getText();jtf.setText(itr+"8");

10、}}elseif(e.getSource()==b[6]){if(com

11、

12、i==0){jtf.setText(f+"9");com=false;i=1;}else{itr=jtf.getText();jtf.setText(itr+"9");}}elseif(e.getSource()==b[8]){if(com

13、

14、i==0){jtf.setText(f+"4");com=false;i=1;}else{itr=jtf.getText();jtf.setText(itr+"4");}}elseif(e.getSou

15、rce()==b[9]){if(com

16、

17、i==0){jtf.setText(f+"5");com=false;i=1;}else{itr=jtf.getText();jtf.setText(itr+"5");}}elseif(e.getSource()==b[10]){if(com

18、

19、i==0){jtf.setText(f+"6");com=false;i=1;}else{itr=jtf.getText();jtf.setText(itr+"6");}}elseif(e.getSource()==b[12]){if

20、(com

21、

22、i==0){jtf.setText(f+"1");com=false;i=1;}else{itr=jtf.getText();jtf.setText(itr+"1");}}elseif(e.getSource()==b[13]){if(com

23、

24、i==0){jtf.setText(f+"2");com=false;i=1;}else