nullpointerexception in android studio code example

Example 1: nullpointerexception java

int x;
x = 10;

Example 2: nullpointerexception

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
}