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

Java Array: Exercise-49 with Solution

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

Pictorial Presentation:

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

Sample Solution:

Java Code:

import java.util.Arrays;
public class Main {

    public static void main(String[] args) {
       int arra_nums[] = {-4, 8, 6, -5, 6, -2, 1, 2, 3, -11};
       System.out.println("Original array : "+Arrays.toString(arra_nums)); 
       int j,temp,arr_size;

        arr_size = arra_nums.length;
        for (int i = 0; i <arr_size; i++){
            j = i;  
            
           //Shift positive numbers left, negative numbers right
         
            while ((j > 0) && (arra_nums[j] >0) && (arra_nums[j-1] < 0)){
                  temp = arra_nums[j];
                  arra_nums[j] = arra_nums[j-1];
                  arra_nums[j-1] = temp;
                  j--;
            }
        }
       System.out.println("New array : "+Arrays.toString(arra_nums)); 
    }       
 }

Sample Output:

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

Flowchart:

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

Visualize Java code execution (Python Tutor):


Java Code Editor:

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Previous: Write a Java program to arrange the elements of a given array of integers where all negative integers appear before all the positive integers.
Next: Write a Java program to sort an array of positive integers of a given array, in the sorted array the value of the first element should be maximum, second value should be minimum value, third should be second maximum, fourth second be second minimum and so on.

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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