CODEWITHSUNDEEP
java
AZCHILENO
AZCHILENO

Reputation: 5

Why is my method printing null instead of the array?

What could be wrong in this code? The test system of the exercise throws the following error

call to the getIntegers () method printed a value of" null ", but" [1,2,3,4,5, 6] "expected. Tip: Check your spaces and / or spelling.

Could it be the private static scanner scanner = new scanner (System.in); since I use it in the main but the system does not allow adding the main, since it brings it by default?

import java.util.Scanner;

import java.util.Arrays;

public class formato {
    

    public static int[] getIntegers(int capacity) {
        static Scanner scanner = new Scanner(System.in);
        int[] array = new int[capacity];
        System.out.println("Enter "+capacity+" integer values:\r");
        for(int i = 0; i<array.length ; i++){
        array[i] = scanner.nextInt();
        }
        return array;
    
    }

    public static void printArray(int[] array) {
        for (int i = 0; i < array.length; i++) {
            System.out.println("Element " + i + " contents " + array[i]);
        }
    }

    public static int[] sortIntegers(int[] array) {
        // int[] sortedArray = new int[array.length];
        // for(int i=0; i<array.length; i++) {
        // sortedArray[i] = array[i];
        int[] sortedArray = Arrays.copyOf(array, array.length);
        // }
        boolean flag = true;
        int temp;
        while (flag) {
            flag = false;
            for (int i = 0; i < sortedArray.length - 1; i++) {
                if (sortedArray[i] < sortedArray[i + 1]) {
                    temp = sortedArray[i];
                    sortedArray[i] = sortedArray[i + 1];
                    sortedArray[i + 1] = temp;
                    flag = true;
                }
            }
        }
        return sortedArray;
    }
}

Upvotes: 0

Views: 246

Answers (2)

suchit chheda
suchit chheda

Reputation: 1

So the place where this error has occurred gives input as "1 2 3 4 5 6" (on checking user logs, input is given as "1 2 3 4 5 6" & not [1,2,3,4,5,6]), so the part where error has arose is "sc.nextLine()" or "sc.nextInt()" being used. The problem is resolved if "sc.next()" is used.

For explanation of difference between next & nextLine/nextInt of scanner, you could view What's the difference between next() and nextLine() methods from Scanner class?

Upvotes: 0

Chayan Mukherjee
Chayan Mukherjee

Reputation: 34

Define a class constant:

public static final Scanner scanner = new Scanner(System.in);

This will help you.

or else just use Scanner scanner = new Scanner(System.in);

Upvotes: 1

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