Java Certification Question 0042

Given the following declaration

Integer i=new Integer(99);

How can you now set the value of i to 10?

1) i=10;
2) i.setValue(10);
3) i.parseInt(10);
4) none of the above

Answer 4: none of the above

The wrapper classes are immutable. Once the value has been set it cannot be changed. A common use of the wrapper classes is to take advantage of their static methods such as Integer.parseInt(String s) that will returns an integer if the String contains one.