textareamethodprg_2.java

java练习程序

import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;

public class TextAreaMethodprg_2 extends Applet implements TextListener
{
  TextArea text1,text2;
  int i=0;
  TextField text3,text4;
  public void init()
  {
  	text1=new TextArea(" ",10,30);
  	text2=new TextArea(" ",10,30);
  	text3=new TextField(10);
  	add(text1);
  	add(text2);
  	text2.setEditable(false);
//  	add(text3);
  	text1.addTextListener(this);
//  	text3.setText("no word");// add myself
/*  	text2.addActionListener(this);
  	text4=new TextField(30);// add myself
  	add(text4);// add myself
  	text4.setEditable(false);// add myself
  	text4.setText("enter: boy girl sun");// add myself
*/
  }
  public void textValueChanged(TextEvent e)
  {
  	String s=text1.getText();
  	double a[]=new double[50];
  	StringTokenizer fenxi=new StringTokenizer(s,",'\n'");
  	int n=fenxi.countTokens();
  	for(int i=0;i<n;i++)
   	{
   		String temp=fenxi.nextToken();//从文本区中取数据
   		a[i]=Double.valueOf(temp).doubleValue();
   	}
   	for(int i=0;i<n;i++)//从小到大排序
   	{
   		for(int j=i+1;j<n;j++)
   		{
   			if(a[j]<=a[i])
   			{
   				double t=a[j];
   				a[j]=a[i];
   				a[i]=t;
   			}
   		}
   	}
   	text2.setText(null);//刷新显示
   	for(int i=0;i<n;i++)
   	{
   		text2.append(""+a[i]+",");
   	}
  }
}