public static void main(String[] args) {
        String s1="kobe";
        String s2="kobe";
        String s3=new String("kobe");
        String s4="kobe"+"Song";
        String s5="Song";
        String s6=s1+s5;
        String s7=s6.intern();
        String s8="kobeSong";
        System.out.println(s1==s2);
        System.out.println(s1==s3);
        System.out.println(s1.equals(s3));
        System.out.println(s4==s6);
        System.out.println(s4.equals(s6));
        System.out.println(s4==s7);
        System.out.println(s4==s8);
    }
}

true
false
true
false
true
true
true