《java简易计数器》word版

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1、packagemy_calculator;publicclassMainclass{publicstaticvoidmain(String[]args){MyFramemf=newMyFrame("Calculator");}}====================================================packagemy_calculator;importjava.awt.*;importjava.awt.event.*;importjava.math.*;publicclassMyFrameext

2、endsFrame{Labellab;ButtonPanelbp;intflag;doubleresult;booleanpt;booleanequal;publicMyFrame(Stringarg0)throwsHeadlessException{super(arg0);Buttonbt=newButton("CE");pt=false;equal=true;result=0.0d;flag=0;lab=newLabel("0",Label.RIGHT);bp=newButtonPanel();setLayout(newB

3、orderLayout());add(lab,BorderLayout.NORTH);add(bp,BorderLayout.CENTER);add(bt,BorderLayout.SOUTH);setLocation(200,200);setSize(300,300);setVisible(true);addWindowListener(newWindowAdapter(){publicvoidwindowClosing(WindowEventarg0){System.exit(0);}});bt.addActionList

4、ener(newActionListener(){publicvoidactionPerformed(ActionEventarg0){result=0.0d;lab.setText("0");}});bp.bt[0].addActionListener(newActionListener(){publicvoidactionPerformed(ActionEventarg0){if(equal==false){lab.setText("7");equal=true;}elseif(pt

5、

6、Double.parseDouble

7、(lab.getText())!=0)lab.setText((newStringBuilder(String.valueOf(lab.getText()))).append("7").toString());elselab.setText("7");}});bp.bt[1].addActionListener(newActionListener(){publicvoidactionPerformed(ActionEventarg0){if(equal==false){lab.setText("8");equal=true;}

8、elseif(pt

9、

10、Double.parseDouble(lab.getText())!=0)lab.setText((newStringBuilder(String.valueOf(lab.getText()))).append("8").toString());elselab.setText("8");}});bp.bt[2].addActionListener(newActionListener(){publicvoidactionPerformed(ActionEventarg0){if(equal==false){

11、lab.setText("9");equal=true;}elseif(pt

12、

13、Double.parseDouble(lab.getText())!=0)lab.setText((newStringBuilder(String.valueOf(lab.getText()))).append("9").toString());elselab.setText("9");}});bp.bt[3].addActionListener(newActionListener(){publicvoidactionPerformed(Actio

14、nEventarg0){flag=1;pt=false;result=Double.parseDouble(lab.getText());lab.setText("0");}});bp.bt[4].addActionListener(newActionListener(){p