該樓層疑似違規已被系統折疊?隱藏此樓查看此樓

希望能幫忙注釋，按鈕的大小也不一樣，排版很不整齊，小數點部分計算總是出錯，我認為是輸入數據為String型的原因，但不知道怎么修改。。如能就這兩點作出改動，感激不盡

import?java.awt.*;

import?javax.swing.*;

import?java.awt.event.*;

class?Counter?extends?WindowAdapter

{

static?JFrame?f=new?JFrame("計算器");

static?JTextField?text1=new?JTextField("0.");

static?String?source="";

static?String?cal="";

static?String?object="";

static?boolean?flag=false;

static?boolean?flag1=true;

static?boolean?flag2=false;

public?void?init()

{

try

{

Container?c=f.getContentPane();

JPanel?pan1=new?JPanel();

JButton?b1=new?JButton("1");

JButton?b2=new?JButton("2");

JButton?b3=new?JButton("3");

JButton?b4=new?JButton("4");

JButton?b5=new?JButton("5");

JButton?b6=new?JButton("6");

JButton?b7=new?JButton("7");

JButton?b8=new?JButton("8");

JButton?b9=new?JButton("9");

JButton?b0=new?JButton("0");

JButton?b11=new?JButton("+");

JButton?b12=new?JButton("-");

JButton?b13=new?JButton("*");

JButton?b14=new?JButton("/");

JButton?b15=new?JButton(".");

JButton?b16=new?JButton("=");

JButton?bclar=new?JButton("C");

JButton?bbc=new?JButton("Backspace");

text1.setHorizontalAlignment(JTextField.RIGHT);

c.add(text1,"North");

c.add(pan1);

A?aa=new?A();

Result?re=new?Result();

Opertion?op=new?Opertion();

Clar?cl=new?Clar();

Backspace?bc=new?Backspace();

b1.addActionListener(aa);

b2.addActionListener(aa);

b3.addActionListener(aa);

b4.addActionListener(aa);

b5.addActionListener(aa);

b6.addActionListener(aa);

b7.addActionListener(aa);

b8.addActionListener(aa);

b9.addActionListener(aa);

b0.addActionListener(aa);

b11.addActionListener(op);

b12.addActionListener(op);

b13.addActionListener(op);

b14.addActionListener(op);

b16.addActionListener(re);

b15.addActionListener(aa);

bclar.addActionListener(cl);

bbc.addActionListener(bc);

pan1.add(b1);

pan1.add(b2);

pan1.add(b3);

pan1.add(b11);

pan1.add(b4);

pan1.add(b5);

pan1.add(b6);

pan1.add(b12);

pan1.add(b7);

pan1.add(b8);

pan1.add(b9);

pan1.add(b13);

pan1.add(b0);

pan1.add(b15);

pan1.add(b16);

pan1.add(b14);

pan1.add(bclar);

pan1.add(bbc);

f.setSize(200,220);

f.setVisible(true);

}

catch(Exception?e)

{

System.out.println(e.getMessage());

}

}

class?A?implements?ActionListener

{

public?void?actionPerformed(ActionEvent?e)

{

String?a=text1.getText();

String?s=e.getActionCommand();

if(a.equals("0.")||a.equals("+")||a.equals("-")||a.equals("*")||a.equals("/"))

text1.setText(s);

else?{

if(flag2)

{

text1.setText(s);

flag2=false;

}

else

text1.setText(a+s);

}

}

}

class?Opertion?implements?ActionListener

{

public?void?actionPerformed(ActionEvent?e)

{

cal=e.getActionCommand();

if(flag1==true)

source=text1.getText();

text1.setText(cal);

flag1=false;

flag=true;

}

}

class?Result?implements?ActionListener

{

public?void?actionPerformed(ActionEvent?e)

{

double?num1;

num1=Double.parseDouble(source);

object=text1.getText();

double?num2;

num2=Double.parseDouble(object);

double?result=0;

if(cal.equals("+"))

result=num1+num2;

if(cal.equals("-"))

result=num1-num2;

if(cal.equals("*"))

result=num1*num2;

if(cal.equals("/"))

if(num2==0)

text1.setText("除數不能為0");

else

result=num1/num2;

String?s1=Double.toString(result);

text1.setText(s1);

flag1=true;

flag2=true;

}

}

class?Clar?implements?ActionListener

{

public?void?actionPerformed(ActionEvent?e)

{

text1.setText("0.");

}

}

class?Backspace?implements?ActionListener

{

public?void?actionPerformed(ActionEvent?e)

{

String?s=text1.getText();

char[]?s1=s.toCharArray();

if(s.length()>=2)

{

String?s2=new?String(s1,0,s.length()-1);

text1.setText(s2);

}

}

}

public?static?void?main(String[]?args)

{

Counter?count=new?Counter();

f.setResizable(false);

count.init();

}

public?void?windowClosing(WindowEvent?e){

System.exit(1);

}

public?void?windowOpened(WindowEvent?e){}

public?void?windowIconified(WindowEvent?e){}

public?void?windowDeiconified(WindowEvent?e){}

public?void?windowClosed(WindowEvent?e){}

public?void?windowActivated(WindowEvent?e){}

public?void?windowDeactivated(WindowEvent?e){}

}

總結

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