nullpointerexception

                                    int x;
x = 10;

                                    Integer num;
num = new Integer(10);

                                    public class MyClass{
private Object iAmNowNull;//This is null by default
    private Object iAmInitialized=new Object();
    public void test(){
    	System.out.println(iAmInitialized.toString());//prints that object
        System.out.println(iAmNull.toString());//throws a NullPointerException
}

                                    public class MyClass{
	private Object iAmNull;//This is null by default
    private Object iAmInitialized=new Object();
    public void test(){
    	System.out.println(iAmInitialized.toString());//prints that object
        System.out.println(iAmNull.toString());//throws a NullPointerException
    }
}