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Java Array Exercises: Arrange the elements of a given array of integers where all negative integers appear before all the positive integers

Java Array: Exercise-48 with Solution

Write a Java program to arrange the elements of a given array of integers where all negative integers appear before all the positive integers.

Pictorial Presentation:

Java Array Exercises: Arrange the elements of a given array of integers where all negative integers appear before all the positive integers

Sample Solution:

Java Code:

import java.util.Arrays;

public class Main {

    public static void main(String[] args) {
        int[] nums = {-4, 8, 6, -5, 6, -2, 1, 2, 3, -11};
		System.out.println("Original Array: "+Arrays.toString(nums)); 
        sort_nums(nums);
        System.out.println("New Array: "+Arrays.toString(nums)); 
    }
    public static void sort_nums(int[] nums){
        int pos_num = 0;
        int neg_num = 0;
        int i,j;
        int max = Integer.MIN_VALUE;
        for(i=0; i<nums.length; i++){
            if(nums[i]<0) neg_num++;
            else pos_num++;
            if(nums[i]>max) max = nums[i];
        }
        max++;
        if(neg_num==0 || pos_num == 0) return;
        i=0;
        j=1;
        while(true){
            while(i<=neg_num && nums[i]<0) i++;
            while(j<nums.length && nums[j]>=0) j++;
            if(i>neg_num || j>=nums.length) break;
            nums[i]+= max*(i+1);
            swap_nums(nums,i,j);
        }

        i = nums.length-1;
        while(i>=neg_num){
            int div = nums[i]/max;
            if(div == 0) i--;
            else{
                nums[i]%=max;
                swap_nums(nums,i,neg_num+div-2); 
            }
        }

    }
    private static void swap_nums(int[] nums, int i , int j){
        int t = nums[i];
        nums[i] = nums[j];
        nums[j] = t;
    }
}

Sample Output:

                                                                              
Original Array: [-4, 8, 6, -5, 6, -2, 1, 2, 3, -11]
New Array: [-4, -5, -2, -11, 6, 6, 1, 2, 8, 3]

Flowchart:

Flowchart: Arrange the elements of a given array of integers where all negative integers appear before all the positive integers

Visualize Java code execution (Python Tutor):


Java Code Editor:

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Java: Tips of the Day

countOccurrences

Counts the occurrences of a value in an array.

Use Arrays.stream().filter().count() to count total number of values that equals the specified value.

public static long countOccurrences(int[] numbers, int value) {
    return Arrays.stream(numbers)
            .filter(number -> number == value)
            .count();
}

Ref: https://bit.ly/3kCAgLb