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1、packagecounter;importjava.awt.Button;importjava.awt.Container;importjava.awt.GridLayout;importjava.awt.Panel;importjava.awt.Toolkit;importjava.awt.event.ActionEvent;importjava.awt.event.ActionListener;importjavax.swing.JButton;importjavax.swing.JFrame;importjavax.swing.JO
2、ptionPane;importjavax.swing.JTextField;publicclassCalculator_JF{privateintgao=Toolkit.getDefaultToolkit().getScreenSize().height;privateintkuan=Toolkit.getDefaultToolkit().getScreenSize().width;privatestaticPanelp;privatestaticJTextFieldtxtnum;privatestaticJButtonb1,b2,b3
3、,b4,b5,b6,b7,b8,b9,b0;privatestaticJButtonequal,ac,point,sroot,plus,minus,asterisk,slash;privatestaticStringsign;privatestaticdoublepro,pro2;privatestaticintpointnum=0;privatestaticintsrootnum=0;privatestaticintequalnum=0;publicCalculator_JF(){//GridLayoutgrid=newGridLayo
4、ut(4,4);JFramejf=newJFrame("计算器");Containerc=jf.getContentPane();c.setLayout(null);jf.setBounds(kuan/4,gao/4,kuan/4,gao/3+20);jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);jf.setVisible(true);p=newPanel();b1=newJButton("1");b2=newJButton("2");b3=newJButton("3");b4=new
5、JButton("4");b5=newJButton("5");b6=newJButton("6");b7=newJButton("7");b8=newJButton("8");b9=newJButton("9");b0=newJButton("0");point=newJButton(".");equal=newJButton("=");ac=newJButton("AC");sroot=newJButton("+/-");plus=newJButton("+");minus=newJButton("-");asterisk=newJB
6、utton("*");slash=newJButton("/");p.add(b1);p.add(b2);p.add(b3);p.add(plus);p.add(b4);p.add(b5);p.add(b6);p.add(minus);p.add(b7);p.add(b8);p.add(b9);p.add(asterisk);p.add(b0);p.add(point);p.add(equal);p.add(slash);p.add(sroot);p.add(ac);p.setBounds(20,70,220,220);txtnum=ne
7、wJTextField();txtnum.setBounds(40,10,180,50);c.add(p);c.add(txtnum);}publicvoidrun(){b1.addActionListener(newActionListener(){publicvoidactionPerformed(ActionEvente){if(equalnum==0)txtnum.setText(txtnum.getText()+"1");else{txtnum.setText("");txtnum.setText(txtnum.getText(
8、)+"1");equalnum=0;}}});b2.addActionListener(newActionListener(){publicvoidactionPerformed(Action
