JAVA EE: Java Tutorial : Java String [intern() method]

Wednesday 30 March 2016

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Java Tutorial : Java String [intern() method]

InternDemo.java

/*
 * public String intern()
 *  
 * Returns: 
 * -------
 * a string that has the same contents as 
 * this string, but is guaranteed to be 
 * from a pool of unique strings.
 */
public class InternDemo
{
    public static void main(String[] args)
    {
        String s1 = new String("hello");
        String s2 = "hello";

        /*
         * returns string from pool, now it will be same as
         * s2
         */

        String s3 = s1.intern();
        System.out.println(s3);

        /*
         * false because reference is different
         */
        System.out.println(s1 == s2);

        /*
         * true because reference is same
         */
        System.out.println(s2 == s3);

    }
}