JavaApplet查找素数小程序代码实例

package calculate;
import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;

public abstract class primeNumBetween extends Applet implements ActionListener
{
    int c=0,d=0;
    int[] res;
    int length;
    Label prompt1 =new Label("上限");
    Label prompt2 =new Label("下限");
    TextField input1 =new TextField(10);
    TextField input2 =new TextField(10);
    TextField output =new TextField(10);

    public void init()
    {
      add(prompt1);
      add(input1);
      add(prompt2);
      add(input2);
      add(new Label("素数有："));
      add(output);
      input1.addActionListener(this);
      input2.addActionListener(this);
      output.addActionListener(this);
    }
    
    public void paint(Graphics g)
    {
      int i;
      for(i=0;i

package chapter.array;

import java.applet.Applet;
import java.awt.Graphics;
import java.awt.Label;
import java.awt.TextField;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.SwingUtilities;

public class ClasA extends Applet implements ActionListener {

  static int[] res = new int[1000000];
  Label prompt1 = new Label("下限");
  Label prompt2 = new Label("上限");
  TextField input1 = new TextField(10);
  TextField input2 = new TextField(10);
  TextField output = new TextField(100);
  int c, d, k = 0;

  @Override
  public void actionPerformed(ActionEvent e) {
    if (e.getSource() == input2) {
      c = Integer.parseInt(input1.getText());
      d = Integer.parseInt(input2.getText());
      output.setText("");
      if (c <2)
        return;
    }
    repaint();
    f(this.getGraphics());
  }

  @Override
  public void init() {
    this.setSize(800, 600);
    add(prompt1);
    add(input1);
    add(prompt2);
    add(input2);
    add(new Label("素数有："));
    add(output);
    input2.addActionListener(this);

    for (int i = 2; i <= 100000; i++) {
      if (isPrime(i)) {
        res[++k] = i;
      }
    }
  }

  private boolean isPrime(int r) {
    for (int i = 2; i d) {
        continue;
      }
      output.setText(output.getText()+" "+Integer.toString(res[i]));
    }
    // g.drawString(Integer.toString(res[i]), 50, 50);
    // 
    repaint();
  }

  @Override
  public void paint(Graphics g) {
  }
}

  
  


>Here's my first Java Applet: