如何更换在java中的ArrayList元素的现有值 [英] How to replace existing value of ArrayList element in java

问题描述

我还是很新的Java编程，我试图用这个code更新数组列表的现有值

I am still quite new to java programming and I am trying to update existing value of Array list by using this code

public static void main(String[] args){

    List<String> list = new ArrayList<String>();

    list.add( "Zero" );
    list.add( "One" );
    list.add( "Two" );
    list.add( "Three" );


    list.add( 2, "New" ); // add at 2nd index


    System.out.println(list);}

我要打印新而不是拖，但我得到了 [零，一新，二，三] 作为结果，我还是有二。我想打印 [零，一，新，三] 。我该怎么做呢？
谢谢。

I want to print New instead of Tow but I got [Zero, One, New, Two, Three] as the result, I still have "Two". I want to print [Zero, One, New, Three]. How do I do this? Thank You..

推荐答案

使用的<一个href=\"http://docs.oracle.com/javase/7/docs/api/java/util/ArrayList.html#set%28int,%20E%29\"><$c$c>set方法用新的替换旧值。

Use the set method to replace the old value with a new one.

list.set( 2, "New" );

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