intern() behaving differently in Java 6 and Java 7

Question

class Test {
    public static void main(String...args) {
        String s1 = \"Good\";
        s1 = s1 + \"morning\";
        System.out.println(s1.intern());
              


        

Answer 1

there are mainly 4 ways to compare string:

1. "== operator": it just compares the reference variable of the string object. So it might give you unexpected results depending upon how you have created the string i.e. using String class's constructor or simply by using double quote as both get memory differently(in heap and pool respectively).
2. "equals(Object) method": this is method of object class and is OVERLOADED by string class. It compares whole string and IS CASE SENSITIVE.
3. "equalsIgnoreCase(String) method": this is method of string class and compares whole string and IS NOT CASE SENSITIVE.
4. "compares(String) method": compare both strings character by character and return their difference if the returned value is 0, this means strings are equal.