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   @Override
public void update(Graphics g) 
{
if(offScreenImage == null)
{
offScreenImage = this.createImage(800, 600);
}
/*
*¶¨ÒåÔÚÐé±³¾°Öл­µÄ“»­±Ê”
*/

Graphics graOffScreen = offScreenImage.getGraphics();

/*
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*/
Color c = graOffScreen.getColor();
graOffScreen.setColor(Color.GREEN);
graOffScreen.fillRect(150, 150, 800, 600);
graOffScreen.setColor(c);


paint(graOffScreen);

g.drawImage(offScreenImage, 0, 0, null);
}


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3.package com.ncs.opts.tools;
import java.util.HashMap;
import java.util.Map;
import com.ncs.opts.common.icp.dao.po.audit.IcpMainHistory;
import com.ncs.opts.common.icp.dao.po.audit.IcpModifyHistory;
import com.ncs.opts.common.icp.dao.po.audit.IcpSiteAccessHistory;
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JavaÖеÄequals()ºÍhashCode()·½·¨

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Effective java ´úÂëÓÅ»¯ÊµÀý

package chape7;
/**
* 檢²é參數µÄÓÐЧÐÔ
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package chape8;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
/**
* µÚ°ËÕ ͨÓóÌÐòÉè¼Æ
* µÚ45Ìõ£º ½«¾Ö²¿±äÁ¿µÄ×÷ÓÃÓò¼õСµ½×îС
*   ½«¾Ö²¿±äÁ¿µÄ×÷ÓÃÓò×îС»¯¡£¿ÉÒÔÔöÇ¿´úÂëµÄ¿É¶ÁºÍ¿Éά»¤ÐÔ£¬²¢½µµÍ³ö´íµÄ¿ÉÄÜÐÔ
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