Array of interception method java

This blog link: https://www.cnblogs.com/ping2yingshi/p/12531721.html

1. Use .arraycopy method - taken array

Usage: arraycopy (former name of the array, the original array subscripts starting target array name, destination array subscripts starting intercept length)

For example:

1. Description: Array arr1 the original array, the array is arr2 target array, you need to three the number of array arr2 assignment to the array arr1.

2. added: can be assigned from anywhere.

code show as below:

import java.awt.List;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.Scanner;

public class test {

    public static void main(String[] args) {
     int arr1[]=new int []{1,2,3,4,5};
     int arr2[]=new int []{7,8,9,10,11};
     for(int i=0;i<5;i++)
        System.out.print(arr1[i]);
     System.out.println();
     for(int i=0;i<5;i++)
         System.out.print(arr2[i]);
     System.out.println();
     System.arraycopy(arr2,0,arr1,0,3);
     for(int i=0;i<5;i++)
         System.out.print(arr1[i]);
   

    }
 }

Output:

2. The method of using the method java.util.Arrays.copyOf - array taken

use: java.util.Arrays.copyOf (former name of the array, a new array length);

For example:

1. Description: Array arr1 the original array, the array is arr2 new array, you need to three the number of the original array arr1 assignment reassigned to a new array arr2.

2. Note:

Only a portion of all the definitions in the original array to a new array.

code show as below:

import java.awt.List;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.Scanner;

public class test {

    public static void main(String[] args) {
     int arr1[]=new int []{1,2,3,4,5};
     for(int i=0;i<5;i++)
        System.out.print(arr1[i]);
     System.out.println();
     int arr2[]=java.util.Arrays.copyOf(arr1,3);
     for(int i=0;i<3;i++)
         System.out.print(arr2[i]);
   

    }
 }

Results are as follows:

Array of interception method java

Guess you like