用JAVA编写计算器程序(模拟Windows计算器)

1、用JAVA编写计算器程序（模拟Windows计算器）import java.awt.*;import java.awt.event.*;public class Calculation extends WindowAdapter implements ActionListener double dResult=0;double dNowInput=0;double dMemory;int n=0; /记载小数位数int nOperation=1; / 记录运算符类型int nBitsNum=0; /记录总共输入的位数boolean alreadyHaveDot=false; /已经有小数点？b

2、oolean keyAvailable=true;boolean alreadyClickedEqueal=false; /是否按下过"="?boolean isTempNowInput=false; /是否在计算出结果后直接按运算符将结果赋给了当前输入值？Frame f;Panel p1,p2,p3,p4,p5,p6;TextField tf1,tf2;Button b1,b2,b3,b4,b5,b6,b7,b8,b9,b0;Button bDiv,bSqrt,bMulti,bMinus,bPercent,bPlus,bReciprocal,bEqual,bDot,bNe

3、gative; Button bBackspace,bCE,bC,bMR,bMS,bMC,bM;public void display()f=new Frame("计算器");f.setSize(280,213);f.setLocation(200,200);f.setBackground(Color.LIGHT_GRAY);f.setResizable(false);f.setLayout(new BorderLayout(3,3);p1=new Panel(new GridLayout(1,3,5,5); /用于存放backspace,ce,c三键p2=new Pane

4、l(new GridLayout(4,5,5,5); /用于存放数字区及附近共20键, 此处间隙设置可能不合理，以后调整p3=new Panel(new GridLayout(5,1,5,5); /用于存放MC,MR,MS,M+键及显示M状态文本框,此处间隙设置可能不合理，以后调整p4=new Panel(new FlowLayout(); /用于存放p1,p2p5=new Panel(new FlowLayout();p6=new Panel(new FlowLayout();p4.add(p1);p4.add(p2);tf1=new TextField(35); /存放显示区tf1.set

5、Text("0.");tf1.setEditable(false);p5.add(tf1);f.add(p5,BorderLayout.NORTH);f.add(p4,BorderLayout.CENTER);f.add(p3,BorderLayout.WEST);b1=new Button("1");b2=new Button("2");b3=new Button("3");b4=new Button("4");b5=new Button("5");b6=new Butto

6、n("6"); b7=new Button("7"); b8=new Button("8"); b9=new Button("9"); b0=new Button("0");b1.addActionListener(this); b2.addActionListener(this); b3.addActionListener(this); b4.addActionListener(this); b5.addActionListener(this); b6.addActionListener(th

7、is); b7.addActionListener(this); b8.addActionListener(this); b9.addActionListener(this); b0.addActionListener(this);bDiv=new Button("/"); bSqrt=new Button("sqrt"); bMulti=new Button("*"); bMinus=new Button("-"); bPercent=new Button("%"); bPlus=new Bu

8、tton("+");bReciprocal=new Button("1/x"); bEqual=new Button("="); bDot=new Button(".");bNegative=new Button("+/-");bDiv.addActionListener(this); bSqrt.addActionListener(this);bMulti.addActionListener(this); bMinus.addActionListener(this); bPercent.add

9、ActionListener(this); bPlus.addActionListener(this);bReciprocal.addActionListener(this); bEqual.addActionListener(this); bDot.addActionListener(this);bNegative.addActionListener(this);p2.add(b7);p2.add(b8);p2.add(b9);p2.add(bDiv);p2.add(bSqrt);p2.add(b4);p2.add(b5);p2.add(b6);p2.add(bMulti);p2.add(b

10、Percent);p2.add(b1);p2.add(b2);p2.add(b3);p2.add(bMinus);p2.add(bReciprocal);p2.add(b0);p2.add(bNegative);p2.add(bDot);p2.add(bPlus);p2.add(bEqual);bBackspace=new Button("Backspace"); bCE=new Button("CE");bC=new Button("C");bBackspace.addActionListener(this); bCE.addAct

11、ionListener(this);bC.addActionListener(this);p1.add(bBackspace);p1.add(bCE);p1.add(bC);tf2=new TextField(2);tf2.setEnabled(false);tf2.setBackground(Color.LIGHT_GRAY); bMC=new Button("MC");bMR=new Button("MR");bMS=new Button("MS");bM=new Button("M+");bMC.addAct

12、ionListener(this);bMR.addActionListener(this);bMS.addActionListener(this);bM.addActionListener(this);p6.add(tf2);p3.add(p6);p3.add(bMC);p3.add(bMR);p3.add(bMS);p3.add(bM);f.setVisible(true);f.addWindowListener(this);public void actionPerformed(ActionEvent e)/key 0 to 9if(this.keyAvailable &&

13、 e.getActionCommand().length()=1 && e.getActionCommand().compareTo("0")>=0 && e.getActionCommand().compareTo("9")<=0)if(this.isTempNowInput)this.dNowInput=0;this.isTempNowInput=false;this.nBitsNum+;if(this.alreadyHaveDot=false)this.dNowInput=this.dNowInput*1

14、0+Double.parseDouble(e.getActionCommand(); elsedouble temp=Double.parseDouble(e.getActionCommand();for(int i=this.n;i<0;i+)temp*=0.1;this.dNowInput+=temp;this.n-;this.tf1.setText(Double.toString(this.dNowInput);/ key dotif(this.keyAvailable && e.getActionCommand()=".")if(this.al

15、readyHaveDot=false)this.nBitsNum+;this.alreadyHaveDot=true;this.n=-1;/key "+","-","*","/"if(this.keyAvailable && e.getActionCommand()="+" | e.getActionCommand()="-" | e.getActionCommand()="*" | e.getActionCommand()="/

16、")if(this.alreadyClickedEqueal)this.dNowInput=this.dResult;this.isTempNowInput=true;elseswitch(this.nOperation)case 1: this.dResult+=this.dNowInput; break;case 2: this.dResult-=this.dNowInput; break;case 3: this.dResult*=this.dNowInput; break;case 4:if(this.dNowInput=0)tf1.setText("除数不能为零&

17、quot;);this.keyAvailable=false;else this.dResult=this.dResult/this.dNowInput;if(this.keyAvailable)tf1.setText(Double.toString(this.dResult); this.dNowInput=0;if(e.getActionCommand()="+")this.nOperation=1;if(e.getActionCommand()="-")this.nOperation=2;if(e.getActionCommand()="

18、*")this.nOperation=3;if(e.getActionCommand()="/")this.nOperation=4;this.nBitsNum=0;this.alreadyClickedEqueal=false;/ key "+/-"if(this.keyAvailable && e.getActionCommand()="+/-") this.dNowInput=0-this.dNowInput;tf1.setText(Double.toString(this.dNowInput); /

19、key "C"if(e.getActionCommand()="C")this.nBitsNum=0;this.dResult=0;this.dNowInput=0;this.alreadyHaveDot=false;this.n=0;this.nOperation=1;this.keyAvailable=true;this.alreadyClickedEqueal=false;tf1.setText("0.");/ key "CE"if(e.getActionCommand()="CE")th

20、is.nBitsNum=0;this.dNowInput=0;this.alreadyHaveDot=false;this.n=0;this.nOperation=1;this.keyAvailable=true;tf1.setText("0.");/ key "sqrt"if(this.keyAvailable && e.getActionCommand()="sqrt") if(this.alreadyClickedEqueal)if(this.dResult>=0)this.dResult=Math.sqr

21、t(this.dResult);tf1.setText(Double.toString(this.dResult);elsetf1.setText("函数输入无效");this.keyAvailable=false;elseif(this.dNowInput>=0)this.dNowInput=Math.sqrt(this.dNowInput); tf1.setText(Double.toString(this.dNowInput); elsetf1.setText("函数输入无效");this.keyAvailable=false;/ key &

22、quot;1/x"if(this.keyAvailable && e.getActionCommand()="1/x") if(this.dNowInput=0)tf1.setText("除数不能为零");this.keyAvailable=false;elsethis.dNowInput=1/this.dNowInput;tf1.setText(Double.toString(this.dNowInput); / key "="if(this.keyAvailable && e.getAct

23、ionCommand()="=") this.alreadyClickedEqueal=true;switch(this.nOperation)case 1: this.dResult+=this.dNowInput; break; case 2: this.dResult-=this.dNowInput; break; case 3: this.dResult*=this.dNowInput; break; case 4:if(this.dNowInput=0)tf1.setText("除数不能为零");this.keyAvailable=false;

24、else this.dResult=this.dResult/this.dNowInput;if(this.keyAvailable)tf1.setText(Double.toString(this.dResult); / key "MS"if(this.keyAvailable && e.getActionCommand()="MS") this.dMemory=this.dNowInput;if(this.dMemory!=0)tf2.setText("M");/ key "MC"if(this

25、.keyAvailable && e.getActionCommand()="MC") this.dMemory=0;tf2.setText("");/ key "MR"if(this.keyAvailable && e.getActionCommand()="MR") this.dNowInput=this.dMemory;tf1.setText(Double.toString(this.dNowInput);/ key "M+"if(this.keyAvailable && e.getActionCommand()="M+") this.dMemory+=this.dNowInput;if(this.dMemory!=0)tf2.setText("M");else tf2.setText("&qu