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import java.util.* ;
class Singleton{
private static Singleton instance;
private List maList;
private boolean etat;

private Singleton(){
maList= new ArrayList();
etat = true;
}
public static Singleton getInstance(){
if (instance==null)
instance=new Singleton();
return instance;
}
}

import java.util.* ;
class Singleton{
private static Singleton instance= new Singleton();
private List maList;
private Boolean etat;

private Singleton(){
maList= new ArrayList();
etat = true;
}
public static Singleton getInstance(){
return instance;
}
}

import java.util.* ;
class Singleton{
private static Singleton instance;
private List maList;
private boolean etat;

private Singleton(){
maList= new ArrayList();
etat = true;
}
public static synchronized Singleton getInstance(){
if (instance==null)
instance=new Singleton();
return instance;
}
}

public class ThreadLocalSingleton{
  private static ThreadLocal initHolder = new ThreadLocal()
  private static ThreadLocalSingleton instance=null;

  public static ThreadLocalSingleton getInstance(){
    if (initHolder.get() == null){
      synchronized{
        if (instance== null)
          instance = new ThreadLocalSingleton();
        initHolder.set(Boolean.TRUE);
      }
    }
    return instance;
  }
}