java編寫計算器

1、太原理工大學 白婭玲/我不知道計算器的%是什么意思。在這里，我認為1%=0.01public class Apublic static void main(String argsFrame f=new Frame("計算器"JTextField t=new JTextField(;t.setHorizontalAlignment(JTextField.RIGHT;/從右往左輸入f.setSize(300,300;f.setLayout(new BorderLayout(5,5;f.setBackground(Color.cyan;f.setLocation(500,400;

2、 Panel p= new Panel(; Panel h= new Panel(;MenuBar mb=new MenuBar(;f.setMenuBar(mb;Menu m1=new Menu("菜單"Menu m2=new Menu("查看"Menu m3=new Menu("編輯"Menu m4=new Menu("幫助"mb.add(m1;mb.add(m2;mb.add(m3;mb.setHelpMenu(m4;MenuItem m11=new MenuItem("文件"MenuIt

3、em m12=new MenuItem("保存"MenuItem m13=new MenuItem("退出"MenuItem m14=new MenuItem("打開"MenuItem m15=new MenuItem("復制"MenuItem m16=new MenuItem("粘貼"MenuItem m17=new MenuItem("關于"MenuItem m18=new MenuItem("介紹"m1.add(m11;m1.add(m12;m1.a

4、ddSeparator(;m1.add(m13;m2.add(m14;m3.add(m15;m3.add(m16;m4.add(m17;m4.add(m18;h.setLayout(new GridLayout(1,3,3,3;Button a1=new Button("CE"Button a2=new Button("C"Button a3=new Button("Backspace"h.add(a1; h.add(a2; h.add(a3;a1.setBackground(new Color(251,74,103;a2.setBa

5、ckground(new Color(251,74,103;a3.setBackground(new Color(251,74,103;/按鈕顏色p.setLayout(new GridLayout(4,5,3,3;Button b1=new Button("7"Button b2=new Button("8"Button b3=new Button("9"Button b4=new Button("/"Button b5=new Button("sprt"Button b6=new Butto

6、n("4"Button b7=new Button("5"Button b8=new Button("6"Button b9=new Button("*"Button b10=new Button("%"Button b11=new Button("1"Button b12=new Button("2"Button b13=new Button("3"Button b14=new Button("-"Button b

7、15=new Button("1/x"Button b16=new Button("0"Button b17=new Button("+/-"Button b18=new Button("+"Button b19=new Button("."Button b20=new Button("="p.add(b1; p.add(b2; p.add(b3;p.add(b4; p.add(b5; p.add(b6;p.add(b7; p.add(b8; p.add(b9;p.add(b

8、10; p.add(b11; p.add(b12;p.add(b13; p.add(b14; p.add(b15;p.add(b16; p.add(b17; p.add(b18;p.add(b19; p.add(b20;b1.setBackground(new Color(249,248,158;b2.setBackground(new Color(249,248,158;b3.setBackground(new Color(249,248,158;b4.setBackground(new Color(205,221,236;b5.setBackground(new Color(205,221

9、,236;b6.setBackground(new Color(249,248,158;b7.setBackground(new Color(249,248,158;b8.setBackground(new Color(249,248,158;b9.setBackground(new Color(205,221,236;b10.setBackground(new Color(205,221,236;b11.setBackground(new Color(249,248,158;b12.setBackground(new Color(249,248,158;b13.setBackground(n

10、ew Color(249,248,158;b14.setBackground(new Color(205,221,236;b15.setBackground(new Color(205,221,236;b16.setBackground(new Color(249,248,158;b17.setBackground(new Color(249,248,158;b18.setBackground(new Color(249,248,158;b19.setBackground(new Color(205,221,237;b20.setBackground(new Color(205,221,236

11、;Monitor bb1=new Monitor(t;a1.addActionListener(bb1;a2.addActionListener(bb1;a3.addActionListener(bb1;b1.addActionListener(bb1;b2.addActionListener(bb1;b3.addActionListener(bb1;b4.addActionListener(bb1;b5.addActionListener(bb1; b6.addActionListener(bb1;b7.addActionListener(bb1;b8.addActionListener(b

12、b1; b9.addActionListener(bb1;b10.addActionListener(bb1; b11.addActionListener(bb1;b12.addActionListener(bb1;b13.addActionListener(bb1; b14.addActionListener(bb1;b15.addActionListener(bb1;b16.addActionListener(bb1;b17.addActionListener(bb1;b18.addActionListener(bb1;b19.addActionListener(bb1;b20.addAc

13、tionListener(bb1;Monitor2 m=new Monitor2(f;f.addWindowListener(m; t.setText("0"f.add(t,BorderLayout.NORTH; f.add(p,BorderLayout.SOUTH; f.add(h,BorderLayout.CENTER;f.pack(;f.setVisible(true; class Monitor implements ActionListenerJTextField t;int flge;double add1;int i=0;String s="&quo

14、t;Monitor (JTextField tthis.t=t;public void actionPerformed(ActionEvent eif(e.getActionCommand(. equals("1"if(t.getText(.trim(.equals("0"t.setText("" String s=t.getText(;s=s+"1"t.setText(s;elseString s=t.getText(;s=s+"1"t.setText(s;else if(e.getActio

15、nCommand(.equals("2"if(t.getText(.trim(.equals("0"t.setText("" String s=t.getText(;s=s+"2"t.setText(s;elseString s=t.getText(;s=s+"2"t.setText(s;else if(e.getActionCommand(.equals("3"if(t.getText(.trim(.equals("0"t.setText("&

16、quot; String s=t.getText(;s=s+"3"t.setText(s;elseString s=t.getText(;s=s+"3"t.setText(s; else if(e.getActionCommand(.equals("4"if(t.getText(.trim(.equals("0"t.setText("" String s=t.getText(;s=s+"4"t.setText(s;elseString s=t.getText(;s=s+&qu

17、ot;4"t.setText(s;else if(e.getActionCommand(.equals("5"if(t.getText(.trim(.equals("0"t.setText("" String s=t.getText(;s=s+"5"t.setText(s;elseString s=t.getText(;s=s+"5"t.setText(s;else if(e.getActionCommand(.equals("6"if(t.getText(.tri

18、m(.equals("0"t.setText("" String s=t.getText(;s=s+"6"t.setText(s;elseString s=t.getText(;s=s+"6"t.setText(s;else if(e.getActionCommand(.equals("7"if(t.getText(.trim(.equals("0"t.setText("" String s=t.getText(;s=s+"7"t.se

19、tText(s;elseString s=t.getText(;s=s+"7"t.setText(s;else if(e.getActionCommand(.equals("8"if(t.getText(.trim(.equals("0"t.setText("" String s=t.getText(;s=s+"8"t.setText(s;elseString s=t.getText(;s=s+"8"t.setText(s;else if(e.getActionCommand

20、(.equals("9" if(t.getText(.trim(.equals("0"t.setText("" String s=t.getText(;s=s+"9"t.setText(s;elseString s=t.getText(;s=s+"9"t.setText(s;else if(e.getActionCommand(.equals("0"if(t.getText(.trim(.equals("0"/0的問題,0在第一位則不顯示t.setText

21、("" String s=t.getText(;s=s+"0"t.setText(s;elseString s=t.getText(;s=s+"0"t.setText(s;else if(e.getActionCommand(.equals("+/-"s=t.getText(;add1=Double.parseDouble(s;double re=-add1;t.setText(re+""/ int a=Integer.valueOf(s;/ a=a*(-1;/ s=String.valueOf

22、(a; 沒問題/ t.setText(s;else if(e.getActionCommand(.equals("." int index = s.indexOf('.'/該方法的作用是查找特定字符或字符串在當前字符串中的起始位置，如果不存在則返回-1if(index=-1/小數(shù)點只能按一次s=s+"."elset.setText(s;if(e.getActionCommand(.equals("+" flge=1;s=t.getText(;add1=Double.parseDouble(s ;t.setText(&q

23、uot;"if(e.getActionCommand(.equals("-"flge=2;s=t.getText(;t.setText(""add1=Double.parseDouble(s ;if(e.getActionCommand(.equals("*"flge=3;s=t.getText(;t.setText(""add1=Double.parseDouble(s ;if(e.getActionCommand(.equals("/"flge=4;s=t.getText(; t.

24、setText(""add1=Double.parseDouble(s ;if(e.getActionCommand(.equals("sprt"flge=5;s=t.getText(;add1=Double.parseDouble(s ;if(e.getActionCommand(.equals("%"flge=6;s=t.getText(;add1=Double.parseDouble(s ;if(e.getActionCommand(.equals("1/x"flge=7;s=t.getText(;add1=

25、Double.parseDouble(s ; if(e.getActionCommand(.equals("C"add1=0;t.setText("0"if(e.getActionCommand(.equals("CE"add1=0;t.setText("0"if(e.getActionCommand(.equals("Backspace"int count;count=s.length(-1; /該方法的作用是返回字符串的長度，也就是返回字符串中字符的個數(shù)if(count>=0s=s.substring(0,count;t.setText(s;elset.setText("0" if(e.getActionCommand(.equals("=" s=t.getText(;double add2=Double.parseDouble(s;double re;if(flge=0re=add2;t.setText(re+""else if(flge=1re=add1+ad