如何在 Java 中替换 ArrayList 元素的现有值 [英] How to replace existing value of ArrayList element in Java
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问题描述
我对 Java 编程还是很陌生,我正在尝试使用以下代码更新 ArrayList
的现有值:
I am still quite new to Java programming and I am trying to update an existing value of an ArrayList
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);
}
我想打印 New
而不是 Two
但我得到了 [Zero, One, New, Two, Three]
作为结果,而且我还有两个
.我想打印[零,一,新,三]
.我怎样才能做到这一点?谢谢.
I want to print New
instead of Two
but I got [Zero, One, New, Two, Three]
as the result, and I still have Two
. I want to print [Zero, One, New, Three]
. How can I do this?
Thank You.
推荐答案
使用 set
用新值替换旧值的方法.
Use the set
method to replace the old value with a new one.
list.set( 2, "New" );
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