JAVA

Fix NullPointerException

import org.apache.commons.lang3.StringUtils;

public class NullPointerExceptionExample {
    private static void printLength(String str) {
        if (StringUtils.isNotEmpty(str)) {
            System.out.println(str.length());
        } else {
            System.out.println("Empty string");
        }
    }

    public static void main(String args[]) {
        String myString = null;
        printLength(myString);
    }
}

nullpointerexception

public class Cat{
private Integer id;
private String name;
public void setId(Integer id){
this.id=id;
}
public Integer getId(){
return this.id;
}
}
public static void main(String[]args){
Cat cat;//nullpointerexception
// you should change Cat c=new Cat();

cat.getId();
}

nullpointerexception

CartPage cartPage = null;

@Before
public void initTest(){
   cartPage  = PageFactory.initElements(driver, CartPage.class);
}

NullPointerException

int x;
int y = x + x;

NullPointerException

Integer num;
num = new Integer(10);

NullPointerException

Integer num;
num = new Integer(10);

NullPointerException

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

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
    }
}