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  1. What will be the output of the program?

    public class StringRef  {     public static void main(String [] args)      {         String s1 = "abc";         String s2 = "def";         String s3 = s2;   /* Line 7 */         s2 = "ghi";         System.out.println(s1 + s2 + s3);     } } 

  2. A.
    abcdefghi
    B.
    abcdefdef
    C.
    abcghidef
    D.
    abcghighi

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    Answer : Option C

    Explanation :

    After line 7 executes, both s2 and s3 refer to a String object that contains the value "def". When line 8 executes, a new String object is created with the value "ghi", to which s2 refers. The reference variable s3 still refers to the (immutable) String object with the value "def".


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