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Java Tutorial : Java String(String pool)

StringTest.java

public class StringTest
{

    public static void main(String[] args)
    {
        String s1 = "Cat";
        String s2 = "Cat";
        String s3 = "Dog";
        String s4 = new String("Cat");

        System.out.println("s1 == s2 : " + (s1 == s2));
        System.out.println("s1 == s3 : " + (s1 == s3));
        System.out.println("s1 == s3 : " + (s1 == s4));
    }

}