public class Example {

    // violates the contract of equals - if two objects are
    // equals, their hashCode() method must return true.
    public boolean equals(Object that) {
        return true;
    }

    public static void main(String []av) {
        String s = "Hello";             // s is interned 
        String v = "Hell" + o();        // v is not
        // v = v.intern();

        // comparing references when should have compared via equals()
        if (s == v) {
            System.out.println(s + " == " + v);
        } else {
            System.out.println(s + " != " + v);
        }

        Example e1 = new Example();
        Example e2 = new Example();
        e1.equals(e2);
    }
    public static String o() { return "o"; }
}