How to merge two arrays in java?
In the following program, two int arrays merge into a third array.
Merging of two int array in Java
public class MergeArrayNumber
{
public static void main(String
args[])
{
int
arr1[]={1,2,3,4,5}; // First Array
int arr2[]={6,7,8,9,10};
// Second Array
int arr3[]=new
int[10]; // Third Array
int i, j, k=0;
// Print the first Array
System.out.println("First Array");
for(i=0; i<5; i++)
{
System.out.print(arr1[i] + " ");
}
System.out.println();
// Print the second Array
System.out.println("Second Array");
for(i=0; i<5; i++)
{
System.out.print(arr2[i]
+ " ");
}
System.out.println();
// Merging of two array
// First array into the
third array
for(i=0; i<5; i++)
{
arr3[k] = arr1[i]; // transferring
arr1 value into arr3
k++;
}
// Second array into the third array
for(i=0; i<5; i++)
{
arr3[k]=arr2[i]; // transferring arr2 value into arr3
k++;
}
System.out.println("After Merging of Two arrays into third
array");
for(i=0; i<k; i++)
{
System.out.print(arr3[i] + " ");
}
System.out.println();
}
}
Output
First Array
1 2 3 4 5
Second Array
6 7 8 9 10
After Merging of Two arrays into third array
1 2 3 4 5 6 7 8 9 10
How to merge two String arrays in java?
In the following program, two String arrays merge into a third String array.
public class
StringMergeArray
{
public static void main(String args[])
{
String arr1[]={"Khurshid",
"Sachin", "Umesh", "Salim",
"Junaid"}; // First String
Array
String arr2[]={"Dhoni",
"Harshit", "Gagan", "Shakil", "Habib"};
// Second String Array
String arr3[]=new String[10]; // Third Array
int i, j, k=0;
System.out.println("First
Array");
for(i=0; i<5; i++)
{
System.out.print(arr1[i] + "
");
}
System.out.println();
System.out.println("\nSecond
Array");
for(i=0; i<5; i++)
{
System.out.print(arr2[i] + "
");
}
System.out.println();
// Merging of two String array
// First array into the third array
for(i=0; i<5; i++)
{
arr3[k]=arr1[i];
k++;
}
// Second array into the third array
for(i=0; i<5; i++)
{
arr3[k]=arr2[i];
k++;
}
System.out.println("\nAfter Merging
of Two arrays into third array");
for(i=0; i<k; i++)
{
System.out.print(arr3[i] + "
");
}
System.out.println();
}
}
Output
First Array
Khurshid Sachin Umesh
Salim Junaid
Dhoni Harshit Gagan
Shakil Habib
Khurshid Sachin Umesh
Salim Junaid Dhoni Harshit Gagan Shakil Habib
Merging of two arrays with method or function in java
import java.util.*;
public class
MergeArrayWithMethod
{
int i, k;
int array3[] = new int[10];
MergeArrayWithMethod()
{
k=0;
}
void mergeArray(int array1[], int array2[])
{
for(i=0; i<5; i++)
{
array3[k] = array1[i];
k++;
}
for(i=0; i<5; i++)
{
array3[k] = array2[i];
k++;
}
}
void printArray()
{
System.out.println("After
merging");
for(i=0; i<k; i++)
{
System.out.print(array3[i] + "
");
}
}
public static void main(String args[])
{
// Object of Scanner class
Scanner sc = new Scanner(System.in);
// Object of MergeArrayWithMethod class
MergeArrayWithMethod ob = new
MergeArrayWithMethod();
int array1[] = new int[5];
int array2[] = new int[5];
int i;
System.out.println("Enter elements
in Array 1 ");
for(i=0 ;i<5; i++)
{
array1[i] = sc.nextInt();
}
System.out.println("Enter elements
in Array 2 ");
for(i=0 ;i<5; i++)
{
array2[i] = sc.nextInt();
}
ob.mergeArray(array1, array2);
ob.printArray();
}
}
Output
Enter elements in Array
1
7
8
9
4
5
Enter elements in Array
2
1
2
3
6
10
After merging
7 8 9 4 5 1 2 3 6 10
Java Program to Concatenate Two Arrays using copyarray method
Concatenate Two Arrays
using arraycopy
import
java.util.Arrays;
public
class ConcatArray
{
public static void main(String[] args) {
int array1[] = {11, 22, 33, 44, 55};
int array2[] = {66, 77, 88, 99};
int length1 = array1.length;
int length2 = array2.length;
int arrConcat[] = new int[length1 +
length2];
// using arraycopy method
System.arraycopy(array1, 0, arrConcat,
0, length1);
System.arraycopy(array2, 0, arrConcat,
length1, length2);
// print the merge array
System.out.println(Arrays.toString(arrConcat));
}
}
Output
[11,
22, 33, 44, 55, 66, 77, 88, 99]
in the above program, we
merge two arrays using the java collection method arraycopy into third array. 'arraycopy’
method is from java.util.Arrays class.
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