Arraylist.addall(c) 方法

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 capacityArrayList<Integer> arrlist = new ArrayList<Integer>(5);// use add() method to add elements in the listarrlist.add(12);arrlist.add(20);arrlist.add(45);// let us print all the elements available in list1System.out.println("Printing list1:");for (Integer number : arrlist) {
   System.out.println("Number = " + number);}// create an empty array list2 with an initial capacityArrayList<Integer> arrlist2 = new ArrayList<Integer>(5);// use add() method to add elements in list2arrlist2.add(25);arrlist2.add(30);arrlist2.add(31);arrlist2.add(35);// let us print all the elements available in list2System.out.println("Printing list2:");for (Integer number : arrlist2) {
   System.out.println("Number = " + number);}// inserting all elements, list2 will get printed after list1arrlist.addAll(arrlist2);System.out.println("Printing all the elements");// let us print all the elements available in list1for (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