Java Exercises: Merge two given sorted array of integers and create a new sorted array

Java Basic: Exercise-113 with Solution

Write a Java program to merge two given sorted array of integers and create a new sorted array.

Example
array1 = [1,2,3,4]
array2 = [2,5,7, 8]
result = [1,2,2,3,4,5,7,8]

Pictorial Presentation:

Sample Solution:

Java Code:

import java.util.*;
public class Example113 {
     public static void main(String[] arg) 
	 {
	 
      // Sorted integer array array1 which has m elements, 
      // but size of array1 is m+n, sorted integer array array2 which has n elements
	    
  //declaration and instantiation.
        int array1[]=new int[8];
//initialization.
       array1[0]=1;
        array1[1]=2;
        array1[2]=3;
        array1[3]=4;
       int[] array2 = {2,5,7,8};
        System.out.println("\nArray1: "+Arrays.toString(array1));  
	    System.out.println("\nArray2: "+Arrays.toString(array2));
		int m =4, n=4;
		int i = m-1, j = n-1, index = m + n - 1;
        while (i >= 0 && j >= 0) {
            if (array1[i] > array2[j]) {
                array1[index--] = array1[i--];
            } else {
                array1[index--] = array2[j--];
            }
        }
        while (i >= 0) {
            array1[index--] = array1[i--];
        }
        while (j >= 0) {
            array1[index--] = array2[j--];
        }
 
    	System.out.println("\nMerged array: "+Arrays.toString(array1));  
	}
}

Sample Output:

Array1: [1, 2, 3, 4, 0, 0, 0, 0]                                       
                                                                       
Array2: [2, 5, 7, 8]                                                   
                                                                       
Merged array: [1, 2, 2, 3, 4, 5, 7, 8]  

Flowchart:

Java Code Editor:

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