Arraylist.addall(c) 方法，arraylist.addall

Arraylist.addall(c) 方法，arraylist.addall

下面的示例演示java.util.Arraylist.addall(c) 方法的用法。

package com.yiibai;

import java.util.ArrayList;

public class ArrayListDemo {
  public static void main(String args[]) {

    // create an empty array list1 with an initial capacity
    ArrayList<Integer> arrlist = new ArrayList<Integer>(5);
	
    // use add() method to add elements in the list
    arrlist.add(12);
    arrlist.add(20);
    arrlist.add(45);

    // let us print all the elements available in list1
    System.out.println("Printing list1:");
    for (Integer number : arrlist) {
      System.out.println("Number = " + number);
    }

    // create an empty array list2 with an initial capacity
    ArrayList<Integer> arrlist2 = new ArrayList<Integer>(5);
	
    // use add() method to add elements in list2
    arrlist2.add(25);
    arrlist2.add(30);
    arrlist2.add(31);
    arrlist2.add(35);

    // let us print all the elements available in list2
    System.out.println("Printing list2:");
    for (Integer number : arrlist2) {
      System.out.println("Number = " + number);
    }

    // inserting all elements, list2 will get printed after list1
    arrlist.addAll(arrlist2);
	
    System.out.println("Printing all the elements");
    // let us print all the elements available in list1
    for (Integer number : arrlist) {
       System.out.println("Number = " + number);
    }
  }
}

让我们来编译和运行上面的程序，这将产生以下结果：

Printing list1:
Number = 12
Number = 20
Number = 45
Printing list2:
Number = 25
Number = 30
Number = 31
Number = 35
Printing all the elements
Number = 12
Number = 20
Number = 45
Number = 25
Number = 30
Number = 31
Number = 35