In Built Function of Array

System.arraycopy(a,i,b,j,n);

a-The array which is to be copied

i- The array index from which copying is started

b-The array in which to be copied

j-The array index to which pasting is started

n-The number of elements to be copied

arrayname.length - calculates the length of array

import java.util.*;

class ArrayFunctionDemo

{

public static void main(String args[])

{   

   //array declaration is done by using  <data type> array_name 

//array initialization is done at run time using new keyword  

int marks[] = new int[4];

Scanner mark = new Scanner(System.in);//Scanner is inbuilt class

System.out.println("ENTER THE MARKS: ");

for(int i=0;i<marks.length;i++)

{

marks[i]=mark.nextInt();//here nextInt is inbuilt method to enter the integer value from user

}

System.out.println("THE MARKS IS:");

//enhanced for loop

for(int x:marks)//or we can write it as: for(int x=0;x<marks.length;x++)

{

System.out.println(x);//here we can also write that System.out.println(marks[]);

}

int arr[]={1,2,3,4,5};//direct initializatio of array

//arraycopy() is the method to copy the one array contents with another using System.arraycopy( , , , , );

System.arraycopy(marks,1,arr,0,2);

for(int m:arr)

{

System.out.println(m);

}

}

}