Equality operator bevaiour for dynamically passed string values in java

Question

public class EqualsCheck {

    /**
     * @param args
     */
    public static void main(String[] args) {
        Scanner sc= new Scanner(System.in);
        Scanner sc1= new Scanner(System.in);
        String s1 = sc.next();
        String s2 = sc1.next();
        equalCheck(s1,s2);
    }

    private static void equalCheck(String s1, String s2) {
        //Using Assignment
        System.out.println(s1 == s2);

        //Using equals

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

        //Printing HashCode

        System.out.println("s1 :"+s1.hashCode()+" s2: "+s2.hashCode());
    }
}

Passed string are :

 s1 = "abc";
 s2 = "abc";

If I do a s1==s2, it returns false. Why string pooling doesn't work here.

I'm voting to close this question as off-topic because this question has been answered on SO a million times before — Scary Wombat, Jan 07 '16 at 08:31
"Using Assignment" there is no assignment here. This is using *identity*. — Andy Turner, Jan 07 '16 at 08:33
There's no string pooling involved whatsoever. You're reading two new strings from `sc`. — chrylis -cautiouslyoptimistic-, Jan 07 '16 at 08:37

score 1 · Answer 1 · answered Jan 07 '16 at 08:35

1

String pooling doesn't work here because you're not putting strings in the string pool.

This doesn't happen automatically for strings constructed at runtime. You would need to call String.intern() to do so.

answered Jan 07 '16 at 08:35

Andy Turner

137,514
11
162
243

Equality operator bevaiour for dynamically passed string values in java

1 Answers1