Singleton Pattern
 Only one instance is created 
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This page describes the following ・ Singleton Pattern sample code
Check with the following class structure
| class | Explanation | 
|---|---|
| singleton.class | Create only one instance | 
| user(Main.class) | Create an instance | 
singleton.class
class singleton{
  private static singleton singleton = new singleton();
  private singleton(){}
  public  static singleton newInstance(){return singleton;}
}
user(Main.class)
public static  void main(String[] args){
  singleton s1 =singleton.newInstance();
}}
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