Thread: Please help me to find out the error in the following code

public class ObjectArray {

public static void main(String[] args) {
Account obj[] = new Account[10];
obj[0].setData(1,2);
obj[1].setData(3, 4);
System.out.println("For Array Element 0:");
obj[0].showData();
System.out.println("For Array Element 1:");
obj[1].showData();
}


public class Account{
int a;
int b;
public void setData(int c,int d){
a=c;
b=d;
}
public void showData(){
System.out.println("Value of a ="+a);
System.out.println("Value of b ="+b);
}
}

The array created in the original code needs a bit where the array elements are created.

Here's a version that doesn't throw a run-time exception.

public class Main {
  public static void main(String[] args){
 
    // class
    class MyClass{
      int x;
      public int get(){
        return this.x;
      };
      public void set(int newX){
        this.x = newX;
      }
    }
    // create array
    MyClass[] mcArray = new MyClass[10]; // size allocated, but elements are null
    System.out.println(String.format("array is %s elements long", mcArray.length));
 
    // attempt to set array elements
    for(MyClass thisOne : mcArray){
      thisOne = new MyClass(); // create new array element where null element was
      thisOne.set(2);
    }
  } // main
} // Main