1:public class stringm
 2:{
 3:
 4:
 5:  void test()
 6:  {
 7:  String t1="string";
 8:  String t2="test";
 9:  String t3;
10:  String t4="";
11:
12:    t3=t1.concat(t2);
13:    t1+=t2;
14:    String t5="stringtest";
15:    String t6="stringtest";
16:    if(t3==t5) { System.out.println("concat is from the pool"); }
17:    if(t1==t5) { System.out.println("+= is from the pool"); }
18:    if(t5==t6) { System.out.println("pool test"); } //only this is true
19:    System.out.println("t3="+t3+" t4="+t4+" t5 ="+t5);
20:  }
21:
22:  public static void main(String arg[])
23:  {
24:     new stringm().test();
25:  }
26:}
27: