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public class Singleton {   
     private static Singleton instance;
      private Singleton (){ //Ê×ÏÈÓÐÒ»¸ö˽ÓеĹ¹ÔìÆ÷
       }
     public static Singleton getInstance() {
     if(instance==null){
         instance=new Singleton ();
      }
      return instance;
     }
}
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public class Singleton {
private Singleton(){
}
private static Singleton instance =new Singleton();
public static Singleton getInstance(){
return instance;
}
}
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public class Singleton {
private static class SingletonHolder {
static Singleton instance = new Singleton();
}
public static Singleton getInstance() {
return SingletonHolder.instance;
}
}
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import java.sql.DriverManager;
import java.sql.ResultSet;
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import java.sql.Statement;
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2 public String decompressData(String encdata) {
3 try {
4 ByteArrayOutputStream bos = new ByteArrayOutputStream(); 
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6 zo ......

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