java.lang.System.arraycopy() method offers a convenient method to copy array elements from one array to another.

System.arraycopy(Object source_array, int source_position,

Object destination_array, int destination_position, number_of_elements)

System.arraycopy() takes five parameters.

First parameter specifies the source_array from where the elements need to be copied.

Second parameter is the position(index) value of the source array from what index array is to be copied.

Third parameter specifies the destination array to which array the values need to be copied. Fourth parameter specifies the destination array starting index.

Fifth parameter specifies the numberOfElements need to be copied from source array to destination array.

Check out your understanding with below example.

import java.io.*;

class Student

{

int b[] = new int[5];

Student(int[] a)

{

System.arraycopy(a,0,b,0,5);

}

void Display()

{

for(int i=0;i<5;i++)

{

System.out.println(b[i]);

}

}

}

class StudentClass

{

public static void main(String [] args) throws IOException

{

DataInputStream dis = new DataInputStream(System.in);

int a[] = new int[5];

System.out.print(”Enter marks : “);

for(int i=0;i<5;i++)

{

a[i]=Integer.parseInt(dis.readLine());

}

Student st = new Student(a);

st.Display();

}

}