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Java Array Exercises: Sort an array of positive integers of a given array in the specified pattern

Java Array: Exercise-50 with Solution

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.

Sample Pattern:

[100, 10, 90, 20, 80, 30, 70, 40, 60, 50]

Sample Solution:

Java Code:

import java.util.Arrays;
 
public class Main
{
     static int[] rearrange(int[] new_arra, int n)
    {
        int temp[] = new int[n];
     
         int small_num = 0, large_num = n-1;
         boolean flag = true;
     
        for (int i=0; i < n; i++)
        {
            if (flag)
                temp[i] = new_arra[large_num--];
            else
                temp[i] = new_arra[small_num++];
     
            flag = !flag;
        }
     
        return temp;
    }
 
    public static void main(String[] args) 
    {
        int nums[] = new int[]{10, 20, 30, 40, 50, 60, 70, 80, 90, 100};
        int result[];
         
        System.out.println("Original Array ");
        System.out.println(Arrays.toString(nums));
         
        result = rearrange(nums,nums.length);
         
        System.out.println("New Array ");
        System.out.println(Arrays.toString(result));
     
    }
}

Sample Output:

                                                                              
Original Array 
[10, 20, 30, 40, 50, 60, 70, 80, 90, 100]
New Array 
[100, 10, 90, 20, 80, 30, 70, 40, 60, 50]

Flowchart:

Flowchart: Sort an array of positive integers of a given array in the specified pattern

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 positive integers appear before all the negative integers.
Next: Write a Java program to separate 0s on left side and 1s on right side of an array of 0s and 1s in random order.

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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