Java.util.ArrayList.add(int index, E elemen)方法实例

描述

The java.util.ArrayList.add(int index, E elemen) method inserts the specified element E at the specified position in this list.It shifts the element currently at that position (if any) and any subsequent elements to the right (will add one to their indices).

声明

Following is the declaration for java.util.ArrayList.add() method

public void add(int index, E element)

参数

• index -- The index at which the specified element is to be inserted.

• element -- The element to be inserted.

返回值

This method does not return any value.

异常

• IndexOutOfBoundsException -- if the index is out of range.

实例一

以下例子将告诉你如何使用 java.util.ArrayList.add(index,E) method.

package gitbook.net;

import java.util.ArrayList;

public class ArrayListDemo {
   public static void main(String[] args) {
      
    // create an empty array list with an initial capacity
    ArrayList<Integer> arrlist = new ArrayList<Integer>(5);

    // use add() method to add elements in the list
    arrlist.add(15);
    arrlist.add(22);
    arrlist.add(30);
    arrlist.add(40);

    // adding element 25 at third position
    arrlist.add(2,25);
	  
    // let us print all the elements available in list
    for (Integer number : arrlist) {
      System.out.println("Number = " + number);
    }  
  }
}   

编译和执行以上程序，将得到以下的结果：

Number = 15
Number = 22
Number = 25
Number = 30
Number = 40

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