What will the following code print out?


public class My {
    public static void main(String...args) {
       Integer i1 = new Integer("013");
       Integer i2 = new Integer(013);
       System.out.println(i1 == i2);
       System.out.println(i1.equals(i2));
    }
}

true
true
false
true
true
false
false
false

Explanation

Constructors of wrapper classes that take String as an argument consider that String as a decimal number. Therefore i1 = 13, i2 = 11.

P.S. In the first case the result will be false even if numbers are equal, because links to different objects are compared - not their values (objects are not added to the pool when new is used).