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？boole

2、an 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,bNegative;Button bBac

3、kspace,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);用于存放 backspace,ce,c 三键用于存放数字区及附近共20键，此处间隙用于存放 MC,MR,MS,M+键及显示 M状态f.setLayout(new BorderLayout(3,3);p1=new Panel(new GridLa

4、yout(1,3,5,5);p2=new Panel(new GridLayout(4,5,5,5);k置可能不合理，以后调整p3=new Panel(new GridLayout(5,1,5,5);文本框，此处间隙设置可能不合理，以后调整p4=newPanel(newFlowLayout();用于存放 p1,p2p5=newPanel(newFlowLayout();p6=newPanel(newFlowLayout();p4.add(p1);p4.add(p2);tf1=new TextField(35);存放显示区tf1.setText("0.");tfl.setEd

5、itable(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 Button("6");b7=new Button

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

7、tionListener(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 Button("+");bReciprocal=new Button("1/x&

8、quot;);bEqual=new Button("=");bDot=new Button(".");bNegative=new Button("+/-");bDiv.addActionListener(this);bSqrt.addActionListener(this);bMulti.addActionListener(this);bMinus.addActionListener(this);bPercent.addActionListener(this);bPlus.addActionListener(this);bRecipr

9、ocal.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(bPercent);p2.add(b1);p2.add(b2);p2.add(b3);p2.add(bMinus);p2.a

10、dd(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.addActionListener(this);bC.addActionListener(this);p1.add(bBackspace)

11、;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.addActionListener(this);bMR.addActionListener(this);bMS.addActionListe

12、ner(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 && e.getActionCommand().length()=1 && e.getActionCommand()

13、.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*10+Double.parseDouble(e.getActionCommand();elsedouble temp=Double.parseDoubl

14、e(e.getActionCommand();for(int i=this.n;i<0;i+)temp*=0.1;this.dNowInput+=temp;this.n-;this.tf1.setText(Double.toString(this.dNowI nput);/ key dotif(this.keyAvailable && e.getActionCommand()=".”)if(this.alreadyHaveDot=false)this.nBitsNum+;this.alreadyHaveDot=true;this.n=-1;/key "

15、+","-","*","/”if(this.keyAvailable && e.getActionCommand()="+" | e.getActionCommand()="-"| e.getActionCommand()="*" | e.getActionCommand()="/")if(this.alreadyClickedEqueal)this.dNowInput=this.dResult;this.isTempNowInput=tr

16、ue;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)(tfl.setText(-除数不能为零");this.keyAvailable=false;else this.dResult=this.dResult/this.dNowInput;if(this.keyAvai

17、lable)tf1.setText(Double.toString(this.dResult);this.dNowInput=0;if(e.getActionCommand()="+")(this.nOperation=1;if(e.getActionCommand()="-")(this.nOperation=2;if(e.getActionCommand()="*")(this.nOperation=3;if(e.getActionCommand()="/")(this.nOperation=4;this.nB

18、itsNum=0;this.alreadyClickedEqueal=false;/ key "+/-"if(this.keyAvailable && e.getActionCommand()="+/-")(this.dNowInput=0-this.dNowInput;tf1.setText(Double.toString(this.dNowInput);/ key "C”if(e.getActionCommand()="C")(this.nBitsNum=0;this.dResult=0;this.dNo

19、wInput=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")(this.nBitsNum=0;this.dNowInput=0;this.alreadyHaveDot=false;this.n=0;this.nOperation=1;this.keyAvailable=t

20、rue;tf1.setText("0.”);/ key "sqrt"if(this.keyAvailable && e.getActionCommand()="sqrt")(if(this.alreadyClickedEqueal)(if(this.dResult>=0)(this.dResult=Math.sqrt(this.dResult);tf1.setText(Double.toString(this.dResult);else(tf1.setText(”函数输入无效");this.keyAvailabl

21、e=false;else(if(this.dNowInput>=0)(this.dNowInput=Math.sqrt(this.dNowInput);tf1.setText(Double.toString(this.dNowInput);else(tf1.setText(”函数输入无效");this.keyAvailable=false;/ key "1/x"if(this.keyAvailable && e.getActionCommand()="1/x")(if(this.dNowInput=0)(tf1.setTe

22、xt("除数不能为零")；this.keyAvailable=false;else(this.dNowInput=1/this.dNowInput;tf1.setText(Double.toString(this.dNowI nput);/ key "=”if(this.keyAvailable && e.getActionCommand()="=")(this.alreadyClickedEqueal=true;switch(this.nOperation)(case1:this.dResult+=this.dNowInput

23、;break;case2:this.dResult-=this.dNowInput;break;case3:this.dResult*=this.dNowInput;break;case4:(if(this.dNowInput=0)(tf1.setText("除数不能为零");this.keyAvailable=false;else this.dResult=this.dResult/this.dNowInput;if(this.keyAvailable)tf1.setText(Double.toString(this.dResult);/ key "MS”if(

24、this.keyAvailable && e.getActionCommand()="MS")(this.dMemory=this.dNowInput;if(this.dMemory!=0)tf2.setText("M");/ key "MC"if(this.keyAvailable && e.getActionCommand()="MC")(this.dMemory=0;tf2.setText("");/ key "MR"if(this.ke

25、yAvailable && 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("");/ key