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The java function belw is generating a NullPointerException. How can I improve it? public int quadraticProbing(String[] hashArray, int initial_index, int collision) {         int index = (initial_index + (collisions * collisions)) % maxSize;         System.out.println("Index " + index);         if (index == maxSize) {             System.out.println("flag 04");             index = 0; // To wrap around the table         }         if (hashArray[index] == null) {                         return index; // We can insert at this location         } else {             // The index isn't empty so we need to insert the value             // at the end of the list         }         collisions = ++collision;         return quadraticProbing(hashArray, initial_index, collision); // Recursive call     }

The java function belw is generating a NullPointerException. How can I improve it? public int quadraticProbing(String[] hashArray, int initial_index, int collision) {         int index = (initial_index + (collisions * collisions)) % maxSize;         System.out.println("Index " + index);         if (index == maxSize) {             System.out.println("flag 04");             index = 0; // To wrap around the table         }         if (hashArray[index] == null) {                         return index; // We can insert at this location         } else {             // The index isn't empty so we need to insert the value             // at the end of the list         }         collisions = ++collision;         return quadraticProbing(hashArray, initial_index, collision); // Recursive call     }

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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Hello

The java function belw is generating a NullPointerException. How can I improve it?

public int quadraticProbing(String[] hashArray, int initial_index, int collision) {
        int index = (initial_index + (collisions * collisions)) % maxSize;
        System.out.println("Index " + index);
        if (index == maxSize) {
            System.out.println("flag 04");
            index = 0; // To wrap around the table
        }
        if (hashArray[index] == null) {            
            return index; // We can insert at this location
        } else {
            // The index isn't empty so we need to insert the value
            // at the end of the list
        }
        collisions = ++collision;
        return quadraticProbing(hashArray, initial_index, collision); // Recursive call
    }
 
Thanks in advance.
Respectfully,
Emmanuel
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I apologize. The solution did not work. The variable collisions is one of the variables declared in the class  as follows:

private int collisions;

The controller initialized collisions as:

collisions = 0;

But these did not help. Following your advice, I tried to use as local variable:

int collision = 0; // did not work

int collisions = 0; // did not work either

I will appreciate your further help.

Respectfully

Emmanuel

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