Two arrays are given. Merge them into one Array.
Example :
Input Array1: int[] arr1= { 13, 17, 88, 93, 65};
Input Array2: int[] arr2= { 35, 45, 68};
Output:
[13, 17 , 88 , 93 , 65 , 35 , 45 , 68 ]
Approach1 : Without using pre-defined function
import java.util.Arrays;
public class MergeArray {
public static void main (String args[] ) {
int arr1[] = { 29, 35, 37,43,67};
int arr2[] = { 65, 75,88};
//Determining the length of both arrays
int a1 = arr1.length;
int a2 = arr2.length;
//Size of the resultant array
int c1 = a1 + b1;
// Creating a new array
int c[ ] = new int[c1];
//Loop to store the elements of first array into resultant array
for( int i=0 ; i<a1 ; i++ ) {
c [ i ]= arr1[i];
}
//Loop to concat the elements of second array into the resultant array to merge
for ( int i=0 , i<b1 ; i++ ) {
c[a1+i] = arr2[i] ;
}
System.out.println(“Merged array is :”+Arrays.toString(c));
}
}
OUTPUT :
[29 ,35 , 37 , 43 , 67 , 65 , 75 , 88 ]
Approach 2 : Using Java Streams
import java.util.Arrays;
import java.util.stream.IntStream;
public class MergeArray{
// Method to merge two arrays using Java Streams
public static int [ ] mergeArrayWithStreams( int [ ] arr1 , int [ ] arr2 ) {
return IntStream.concat(Arrays.stream(arr1) , Arrays.stream(arr2)).toArray( ) ;
}
public static void main (String args [] ) {
int arr1 [ ] = { 35 , 39 , 45, 47 , 55};
int arr2 [ ] = { 65 , 75 , 88 };
// Merging arrays using Java Streams by calling the above method mergeArrayWithStreams(int arr1[] , int arr2[]) .
int mergedArr [] = mergeArrayWithStreams( arr1 , arr2 ) ;
System.out.println(“Merged array is :”+Arrays.toString(mergedArr));
}
}
OUTPUT :
[ 35 , 39 , 45 , 47 , 55 , 65 , 75 , 88 ]