Array of Classes NullPointerException

Question

This is Element class:

public class Element {

    private String elementName;
    private int atomicNumber;
    private String Symbol;
    priv         


        

Answer 1

You need to create objects. You just created array of object references.

Element[] element = new Element[103];
for(int i=0; i<103; i++) {
   element[i] = new Element();
}

As your element is object (arrays are object) and it is stored on heap. All Element object references are initialized to null value. Due to which you are getting NPEs.

Element[] element = new Element[103];
element[0].setElementName("H");  // element[0] is null