Can anyone help me with this

Question

I have written this snippet as this logic is used in one of my school projects. Please help me resolve this issue.
https://code.sololearn.com/ch26rsbC240g/?ref=app
https://code.sololearn.com/ch26rsbC240g/?ref=app

Answer 1

Now that you're asking for multiple objects, here is an example showing that:
public class Q3
{
static Q3[] obj;
public int rno;
public static void main(String[] args) {
obj=new Q3[3];
for (int i = 0; i < obj.length; i++) {
obj[i] = new Q3();
obj[i].rno=(int)(Math.random() * 50);
}
for (int i = 0; i < obj.length; i++) {
System.out.println(obj[i].rno);
}
}
}

It sounds like you should look up how to use arrays.

Answer 2

Add the commented line below and it'll run without throwing an exception:
public class Q3
{
static Q3[] obj;
public int rno;
public static void main(String[] args) {
obj=new Q3[1];
obj[0] = new Q3(); // added this line so obj[0] won't be null.
obj[0].rno=30;
System.out.print(obj[0].rno);
}
}

Answer 3

Nice that it worked. If you think I answered your question well, please hit the checkmark on it.

Answer 4

But I want to add multiple objects, not only 1
i.e. obj=new Q3[3]

Answer 5

Yea I also tried using loops and it worked