java nullPointerException code example

Example 1: how to use a try catch for a null pointer exception in java

int n;//decalred as null
n = n + 1;//null pointer exception
/////////////////////////////////////
int n = 5;
n = n + 1;//no null pointer exception

Example 2: nullpointerexception java

Integer num;
num = new Integer(10);

Example 3: NullPointerException

TestObject a = new TestObject();String b = a.getTestResult();b.toString();

Example 4: nullpointerexception java

int x;
x = 10;

Example 5: 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
    }
}

Example 6: null pointer exception method

public class MainClass {

    public static void main(String[] args) {
        anotherTest();
        test();
    }
    public static void test() {
        System.out.println("Printed from the test method.");
    }
    public static void anotherTest() {
        System.out.println("Printed from the anotherTest method.");
    }
}