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/**

*?Title:Calculate?acount?of?prime?number?between?preNum?and?rearNum;

*?Author:?public

*?Time：2008.12.5?21:09:35

*/

import?java.awt.*;

import?java.awt.event.*;

class?Arithmetic{//將計算質數個數的類封裝在此類中

private?int?preNum?=?0;

private?int?rearNum?=?0;

private?int?amount?=?0;

void?setNum(int?preNum,int?rearNum){

this.preNum?=?preNum;

this.rearNum?=?rearNum;

}

int?AriNum(){

Boolean?flag?=?new?Boolean(false);

for(int?i?=?preNum;i<=rearNum;i++){

flag?=?false;

for(int?j?=?2?;j

if(i%j?==?0)

flag?=?true;

else

;

}//for

if(flag?==?false)

amount++;

else

;

}//for

return?amount;

}

}

public?class?Prime?extends?WindowAdapter?implements?ActionListener{

private?Frame?f;

private?TextField?tf1,tf2,tf;

private?Button?b;

String?str;

void?initFrame(){

f?=?new?Frame("求兩個整數之間質數個數的應用程序");

tf1?=?new?TextField("請輸入左邊界",17);

tf2?=?new?TextField("請輸入有邊界",17);

tf?=?new?TextField("",25);

b?=?new?Button("確定");

FlowLayout?fl?=?new?FlowLayout();

f.setLayout(fl);

f.add(tf1);

f.add(tf2);

f.add(b);

f.add(tf);

f.addWindowListener(this);

b.addActionListener(this);

f.setSize(350,140);

f.setVisible(true);

}

public?void?actionPerformed(ActionEvent?ae){

String?str1?=?tf1.getText();

String?str2?=?tf2.getText();

int?num1,num2,amount;

Arithmetic?a?=?new?Arithmetic();

try{

num1?=?Integer.valueOf(str1);

num2?=?Integer.valueOf(str2);

a.setNum(num1,?num2);

amount?=?a.AriNum();

str?=?String.valueOf(amount);

}

catch(Exception?e){

tf1.setText("請重新輸入");

tf2.setText("請重新修輸入");

}

tf.setText(str);

}

public?void?windowClosing(WindowEvent?we){

System.exit(0);

}

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

Prime?test?=?new?Prime();

test.initFrame();

}

}

希望大家多給意見！！�

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