[Java Design Pattern_5]Singleton 샘플 코드1

Triple.java


package com.sgdata.singleton;

public class Triple {
private static Triple[] triple = new Triple[ ] {
new Triple(0) ,
new Triple(1) ,
new Triple(2) ,
};
private int id;
private Triple(int id){
System.out.println("The instance " + id + " is created. ");
this.id = id;
}
public static Triple getInstance(int id){
return triple[id];
}
public String toString(){
return "[Triple id=" + id + "]";
}
}

Main.java

package com.sgdata.singleton;

public class Main {

public static void main(String[] args) {

System.out.println("Start");

for(int i=0;i<9;i++){

Triple triple = Triple.getInstance(i%3);

System.out.println(i+":"+triple);

}

System.out.println("End.");

}

}