CODEWITHSUNDEEP
javaarraysobjectnullpointerexception
vikasThakur.com
vikasThakur.com

Reputation: 578

NullPointerException while working with Object array

I am getting NullPointerException in this program. I believe there's some problem in declaring Object Array.

import java.util.Scanner;

class One 
{
    public static void main(String args[]) 
    {
        Scanner key = new Scanner(System.in);
        two[] obj = new two[3];

        for (int i = 0; i < 3; i++) {
            obj[i].roll = key.nextInt();
            obj[i].name = key.nextLine();
            obj[i].grade = key.nextLine();
        }

        for (int i = 0; i < 3; i++) {
            System.out.println(obj[i].roll + " " + obj[i].name + " " + obj[i].grade);
        }
    }
}

class Two 
{
    int roll;
    String name, grade;
}

Upvotes: 0

Views: 47

Answers (2)

Bene
Bene

Reputation: 734

Your objects inside the array are not initialized. Call obj[i] = new Two(); as your fist statement in the first for loop. Btw: "two" must be uppercase "Two"

Upvotes: 0

Eran
Eran

Reputation: 393781

You forgot to initialize the objects in the array. Without this initialization, obj[i] contains a null reference.

two[] obj=new two[3];
for(int i=0;i<3;i++)
{
    obj[i] = new two();
    obj[i].roll=key.nextInt();
    obj[i].name=key.nextLine();
    obj[i].grade=key.nextLine();
}

Upvotes: 3

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