lee — Fri, 16 Dec 2005 17:17:00 GMT

import java.awt.*;
import java.awt.event.*;
import java.util.*;
class wenben extends Frame implements TextListener,ActionListener{
Button butExit = null;
TextArea text1 = null; //输入文�g�?BR> TextArea text2 = null; //�l�果输出的文件域
public wenben(){
  butExit = new Button();
  add(butExit);
  butExit.addActionListener(this);
   setLayout(null);　　　　//讄��界面的格�?BR>  setBounds(35,35,280,250);
  butExit.setBounds(50,200,180,20);
  butExit.setLabel("��d��");
   text1 = new TextArea(" ",10,10);
   text1.setBounds(40,50,100,100);
    text2 = new TextArea(" ",10,10);
   text2.setBounds(150,50,100,100);
   add(text1);
   text1.addTextListener(this);
    add(text2);
   text2.setEditable(false);
   text2.addTextListener(this);
    setVisible(true);
}
public void actionPerformed(ActionEvent e){
System.exit(-1);
}
public void textValueChanged(TextEvent e)
  {
   double averge = 0; //均�?BR>   double result = 0; // �?BR>   int i = 0;
   if(e.getSource()==text1)
    {
    String str = text1.getText();
    StringTokenizer detect = new StringTokenizer(str); //stringtokenizer很用的类,对字�W�的处理功能强大
    int n = detect.countTokens();
    double[] dou = new double[n]; //也可分配一静态的数组,�q�样不用每次分配�I�间,但是数组的长度的变化�~�少灉|��?BR>    for(i = 0;i    {
      String temp = detect.nextToken();
      dou[i]=Double.valueOf(temp).doubleValue();
      result = result+dou[i];
    }
    text2.setText(""+result+'\n'+(result/i));
    }
  }
  public static void main(String[] args){
   wenben wb = new wenben();
  }
}

lee 2005-12-17 01:17 发表评论

对两个Ｓtring�c�d��的比较．

lee — Tue, 13 Dec 2005 05:19:00 GMT

class string{
static String str = new String("yes");
string(){}
}
public class rtyh {
public static void main(String[] args){
  string strr = new string();
  String st = new String("yes");
  String str = new String("yes");
String str1 = "yes";
String str2 = "yes";
System.out.println(str1==str2);
  System.out.println(st.equals(str));
  System.out.println(st==str);
  System.out.println(str.equals(strr.str));
  System.out.println(str==strr.str);
   }
}
�l�果为　ture
               ture
　　　　ture
　　　　ture
                false
所以，==用来对引用的判断,如果是引用的同一个内存单元则相等�Q�否则不相等�Q�equals�Q�）用来对字�W�串内容的逐一判断�Q?/P>

lee 2005-12-13 13:19 发表评论

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对两个Ｓtring�c�d��的比较．