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import javax.swing.*;
import java.awt.*;
public class ToCenter
{
  public ToCenter(JFrame frame)
   {
       //---------------------------ÉèÖô°¿Ú¾ÓÖÐ----------------------------------------------------------
        int windowWidth = frame.getWidth();                     //»ñµÃ´°¿Ú¿í
        int windowHeight = frame.getHeight();                   //»ñµÃ´°¿Ú¸ß
         Toolkit kit = Toolkit.getDefaultToolkit();              //¶¨Ò幤¾ß°ü
         Dimension screenSize = kit.getScreenSize();             //»ñÈ¡ÆÁÄ»µÄ³ß´ç
        int screenWidth = screenSize.width;                     //»ñÈ¡ÆÁÄ»µÄ¿í
        int screenHeight = screenSize.height;                   //»ñÈ¡ÆÁÄ»µÄ¸ß
         frame.setLocation(screenWidth/2-windowWidth/2, screenHeight/2-windowHeight/2);//ÉèÖô°¿Ú¾ÓÖÐÏÔʾ
         //------------------------------------------------------------------------------------------------
   }
}
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import java.util.regex.*;
public final class RegExpValidator
{
/**
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* @return Èç¹ûÊÇ·ûºÏµÄ×Ö·û´®,·µ»Ø <b>true </b>,·ñÔòΪ <b>false </b>
*/
public static boolean isEmail(String str)
{
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package com.yz.mystack;
public class Node {
Object data;
Node next;
public Node(Object data){
this.data=data;
next=null;
}
public Object getData() {
return data;
}
public void setData(Object data) {
this.data = data;
}
public Node getNext() {
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import   javax.swing.*;  
import   java.awt.*;  
import   java.awt.event.*;  
import   java.util.*; 
public class Temp {
 public Temp() {
  JFrame J = new JFrame("MENU");
  Container C = J. ......

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