质数(java两个问题)
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import java.io.*;
public class AppletPrime extends Applet
{
Label num=new Label( "请输入一个自然数: ");
TextField tfnum=new TextField(5);
Button show = new Button ( "显示所有的质数: ");
public void init(){
setLayout(new FlowLayout());
add(num);
add(tfnum);
add(show);
show.addActionListener(new ShowActionAdapter());
}
class ShowActionAdapter implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
try{
String s1=tfnum.getText();
int d=Integer.parseInt(s1);
{for(int i=2;i <=d;i++)
{
for(int j=2;j <i;j++)
{
if(i%j!=0)
System.out.print(i+ " ");
else
break;
}
}
}
}catch(Exception e1){}
}
}
}
1、比如输入一个11，运行此程序在eclipse的控制台得到的结果为：3 5 5 5 7 7 7 7 7 9 11 11 11 11 11 11 11 11 11 ；
2、怎么让他在applet小程序中显示出来？？？
急！！！！
[解决办法]
if (i % j == 0)
break;
else if(i == j + 1)
System.out.print(i+ " ");
[解决办法]
http://community.csdn.net/Expert/topic/5477/5477418.xml?temp=.8386804
[解决办法]
1.
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import java.io.*;
import javax.swing.JOptionPane;
public class AppletPrime extends Applet {
Label num = new Label( "请输入一个自然数: ");
TextField tfnum = new TextField(5);
Button show = new Button( "显示所有的质数: ");
TextArea txtprime = new TextArea();
public void init() {
setLayout(new FlowLayout());
add(num);
add(tfnum);
add(show);
add(txtprime);
show.addActionListener(new ShowActionAdapter());
}
class ShowActionAdapter implements ActionListener {
public void actionPerformed(ActionEvent e) {
try {
String s1 = tfnum.getText();
int d = Integer.parseInt(s1);
{
for (int i = 2; i <= d; i++) {
if (isPrimeNumber(i))// 如果是素数，则输出它
{
txtprime.append(String.valueOf(i)+ ", ");
}
}
}
} catch (Exception e1) {
}
}
}
public static boolean isPrimeNumber(int number) {
if (number < 2) {
return false;
}
for (int i = 2; i <= Math.sqrt(number); i++) {
if (number % i == 0 && number != 2) {
return false;
}
}
return true;
}
}
2.
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN ">
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME= "Generator " CONTENT= "EditPlus ">
<META NAME= "Author " CONTENT= " ">
<META NAME= "Keywords " CONTENT= " ">
<META NAME= "Description " CONTENT= " ">
</HEAD>
<BODY>
<APPLET CODE= "AppletPrime.class " WIDTH= "500 " HEIGHT= "500 ">
</APPLET>
</BODY>
</HTML>
