Thread: Article: Re: Common Java Mistakes

The issue in the provided code is that the neighbors array is not initialized when a Node object is created. Therefore, when trying to access myNode.neighbors[0], a NullPointerException occurs because neighbors is still null.

To fix this, you need to initialize the neighbors array either when declaring it or in the constructor. Here's the modified code:
public class Node {
public Node[] neighbors;
public int value;

public Node(int value) {
this.value = value;
// Initialize neighbors array to an appropriate size
this.neighbors = new Node[5]; // Assuming a maximum of 5 neighbors
}
}

public class NodeTester {
public static void main(String[] args) {
Node myNode = new Node(5);
myNode.neighbors[0] = new Node(3);
}
}
Now, when you create a Node object, its neighbors array will be initialized, and you won't encounter a NullPointerException when accessing its elements. You can find more assistance with Java assignments on https://www.programminghomeworkhelp....va-assignment/