New String vs String s = "something" , what's the difference ?

Question

Consider the code :

public class Strings {

    public static void createStr()
    {
        String s1 = new String("one");
        String s2 = "one";

        System.out.println(s1);
        System.out.println(s2);
    }

    public static void main(String args[])
    {
        createStr();
    }

}

What's the difference between String s1 = new String("one"); and String s2 = "one"; ?

score 7 · Answer 1 · answered Mar 24 '14 at 09:20

7

  String s1 = new String("one"); // will be created on the heap and not interned unless .intern() is called explicityly. 
  String s2 = "one";  // will be created in the String pool and interned automatically by the compiler.

answered Mar 24 '14 at 09:20

TheLostMind

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"will be created on the heap"---maybe. It could also be allocated on the stack. This is outside of programmer's control. – Marko Topolnik Mar 24 '14 at 09:23
@MarkoTopolnik - Could you be more specific please. – TheLostMind Mar 24 '14 at 09:24
Escape Analysis may prove that the string can safely be allocated on the stack. – Marko Topolnik Mar 24 '14 at 09:27
@MarkoTopolnik - oh. Never knew that.. Thanks :) – TheLostMind Mar 24 '14 at 09:29

score 0 · Answer 2 · answered Mar 24 '14 at 09:21

0

String s1 = new String("one"); create a new string object in memory, while String s2 = "one"; use the string pool.

It is not a good practice to use new keyword when dealing with string in java.

answered Mar 24 '14 at 09:21

fluminis

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New String vs String s = "something" , what's the difference ?

2 Answers2