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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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package com.yz.mylink;
public class Student {
private Integer id;
private String name;
private Integer age;
private String classes;
public Integer getId() {
return id;
}
public void setId(Integer id) {
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       begin
            insert into test value(param1,param2);
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