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 WindowAdapterimplements ActionListenerdouble dResult=0;double dNowI nput=O;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boolea n alreadyHaveDot=false;/ 已经有小数点？bool

2、ea n keyAvailable=true;boolean alreadyClickedEqueal=false;是否按下过"="?boolean isTempNowl nput=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;Pa nel p1,p2,p3,p4,p5,p6;TextField tf1,tf2;Butt on b1,b2,b3,b4,b5,b6,b7,b8,b9,b0;Butt on bDiv,bSqrt,bMulti,bMi nus,bPerce nt,bPlus,bReciprocal,bEqual,bDot,bNe

3、gative;Butt on bBackspace,bCE,bC,bMR,bMS,bMC,bM;public void display()f=new Frame(” 计算器");f.setSize(280,213);f.setLocatio n(200,200);f.setBackgrou nd(Color.LIGHT_GRAY);f.setResizable(false);f.setLayout (new BorderLayout(3,3);p1= new Pan el( new GridLayout(1,3,5,5);/用于存放 backspace,ce,cp2=new Pan

4、el( new GridLayout(4,5,5,5);/用于存放数字区及附近共设置可能不合理，以后调整p3=new Pa nel( new GridLayout(5,1,5,5);用于存放MC,MR,MS,M+三键20键，此处间隙键及显示M状态文本框，此处间隙设置可能不合理，以后调整p4=new Pan el( newFlowLayout();/用于存放p1,p2p5=new Pan el( newFlowLayout();p6=new Pan el( newFlowLayout();p4.add(p1);p4.add(p2);tf1= new TextField(35);/存放显示区tf1

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

6、);b6=new Butto n("6");b7=new Butt on ("7");b8=new Butto n("8");b9=new Butto n("9");b0=new Butto n("0");bl.addAct ion Liste ner(this); b2.addAct ion Liste ner(this);b3.addAct ion Liste ner(this);b4.addAct ion Liste ner(this);b5.addAct ion Liste ner(th

7、is);b6.addAct ion Liste ner(this);b7.addAct ion Liste ner(this);b8.addAct ion Liste ner(this);b9.addAct ion Liste ner(this); bO.addAct ion Liste ner(this);bDiv= new Butto n("/"); bSqrt=new Butto n( "sqrt"); bMulti=new Butto n("*"); bMinus=new Butto n("-"); bPe

8、rce nt=newButto n("%");bPlus=newButto n("+");bReciprocal=newButto n("1/x");bEqual=newButt on ("=");bDot= new Butto n("."); bNegative=newButto n("+/-");bDiv.addActio nListe ner(this);bSqrt.addAct ion Liste ner(this); bMulti.addActio nListe n

9、er(this); bMinu s.addAct ion Liste ner(this); bPerce nt.addAct ion Liste ner(this); bPIus.addAct ion Liste ner(this); bReciprocal.addActi on Liste ner(this); bEqual.addAct ion Liste ner(this); bDot.addActi on Liste ner(this); bNegative.addAct ion Liste ner(this); p2.add(b7);p2.add(b8); p2.add(b9);p2

10、.add(bDiv);p2.add(bSqrt); p2.add(b4); p2.add(b5);p2.add(b6);p2.add(bMulti); p2.add(bPerce nt);p2.add(b1);p2.add(b2); p2.add(b3);p2.add(bMi nus); p2.add(bReciprocal);p2.add(b0); p2.add(bNegative);p2.add(bDot); p2.add(bPlus);p2.add(bEqual);bBackspace=newButt on ("Backspace");bCE=new Butt on

11、("CE");bC=new Butto n("C");bBackspace.addAct ion Liste ner(this);bCE.addAct ion Liste ner(this);bC.addActi on Liste ner(this);p1.add(bBackspace);p1.add(bCE);p1.add(bC);tf2=new TextField(2);tf2.setE nabled(false);tf2.setBackgrou nd(Color.LIGHT_GRAY);bMC=new Butto n("MC")

12、;bMR=new Butto n("MR");bMS=new Butto n("MS");bM=new Butt on ("M+");bMC.addActio nListe ner(this);bMR.addActio nListe ner(this);bMS.addActi on Liste ner(this);bM.addActio nListe ner(this);p6.add(tf2);p3.add(p6);p3.add(bMC);p3.add(bMR);p3.add(bMS);p3.add(bM);f.setVisible(

13、true);f.addWi ndowListe ner(this);public void actionPerformed(ActionEvente)/key 0 to 9if(this.keyAvailable && e.getActio nComma nd().len gth()=1&& e.getActi on Comma nd().compareTo("0")>=0&& e.getActionCommand().compareTo("9")<=0)if(this.isTempNowl n

14、put)this.dNowI nput=O;this.isTempNowI nput=false;this. nBitsNum+;if(this.alreadyHaveDot=false)this.dNow In put=this.dNow In put*10+Double.parseDouble(e.getActi on Comma nd();elsedouble temp=Double.parseDouble(e.getActi on Comma nd();for(int i=this.n;i<0;i+)temp*=0.1;this.dNow In put+=temp;this. n

15、-;this.tf1.setText(Double.toStri ng(this.dNow In put);/ key dotif(this.keyAvailable && e.getActionCommand()=".")if(this.alreadyHaveDot=false)this. nBitsNum+;this.alreadyHaveDot=true;this. n=-1;/key "+","-","*","/"if(this.keyAvailable &&am

16、p; e.getAct ion Comma nd()="+"| e.getAct ion Comma nd()="-"| e.getActionCommand()="*"| e.getActionCommand()="/")if(this.alreadyClickedEqueal)this.dNowI nput=this.dResult;this.isTempNowI nput=true;elseswitch(this .n Operati on)case1:this.dResult+=this.dNowl npu

17、t;break;case2:this.dResult-=this.dNowl nput;break;case3:this.dResult*=this.dNowl nput;break;case4:if(this.dNowl nput=O)tfl.setText(”除数不能为零”)；this.keyAvailable=false;else this.dResult=this.dResult/this.dNowInput;if(this.keyAvailable)tf1.setText(Double.toStri ng(this.dResult);this.dNowI nput=O;if(e.ge

18、tActio nComma nd()="+")this .n Operati on=1;if(e.getActio nComma nd()="-")this .n Operati on=2;if(e.getActio nComma nd()="*")this .n Operati on=3;if(e.getActio nComma nd()="/")this .n Operati on=4;this. nBitsNum=O;this.alreadyClickedEqueal=false;/ key "+/

19、-"if(this.keyAvailable && e.getActionCommand()="+/_") this.dNowI nput=0-this.dNowl nput;tf1.setText(Double.toStri ng(this.dNowI nput);/ key "C"if(e.getActio nComma nd()="C")this. nBitsNum=O;this.dResult=0;this.dNowI nput=O;this.alreadyHaveDot=false;this. n=

20、0;this .n Operati on=1;this.keyAvailable=true;this.alreadyClickedEqueal=false;tf1.setText("0.");/ key "CE"if(e.getActio nComma nd()="CE")this. nBitsNum=O;this.dNowI nput=O;this.alreadyHaveDot=false;this. n=0;this .n Operati on=1;this.keyAvailable=true;tf1.setText("

21、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.toStri ng(this.dResult);elsetf1.setText("函数输入无效”)；this.keyAvailable=false;elseif(this

22、.dNowl nput>=0)this.dNow In put=Math.sqrt(this.dNow In put);tf1.setText(Double.toStri ng(this.dNow In put);elsetf1.setText("函数输入无效”)；this.keyAvailable=false;/ key "1/x"if(this.keyAvailable && e.getActionCommand()="1/x")if(this.dNowl nput=O)tf1.setText("除数不能为零

23、”)；this.keyAvailable=false;elsethis.dNowI nput=1/this.dNowl nput;tf1.setText(Double.toStri ng(this.dNow In put);/ key "="if(this.keyAvailable && e.getActionCommand()="=")this.alreadyClickedEqueal=true;switch(this .nO peratio n)case1:this.dResult+=this.dNowl nput;break;cas

24、e2:this.dResult-=this.dNowl nput;break;case3:this.dResult*=this.dNowl nput;break;case4:if(this.dNowI nput=0)tf1.setText("除数不能为零");this.keyAvailable=false;else this.dResult=this.dResult/this.dNowlnput;if(this.keyAvailable)tf1.setText(Double.toStri ng(this.dResult);/ key "MS"if(thi

25、s.keyAvailable && e.getActionCommand()="MS")this.dMemory=this.dNow In put;if(this.dMemory!=0)tf2.setText("M");/ key "MC"if(this.keyAvailable && e.getActionCommand()="MC")this.dMemory=0;tf2.setText("");/ key "MR"if(this.keyAv

26、ailable && e.getActionCommand()="MR")this.dNowI nput=this.dMemory;tf1.setText(Double.toStri ng(this.dNowI nput);/ key "M+"if(this.keyAvailable && e.getActionCommand()="M+")this.dMemory+=this.dNow In put;if(this.dMemory!=0)tf2.setText("M");else tf2.setText(""