Java 如何找到数组列表的长度？
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How to find the length of an array list?
提问by user1254044
I don't know how to find the length of an array list. I think you might need to use blank.length();but I'm not sure.
我不知道如何找到数组列表的长度。我认为您可能需要使用，blank.length();但我不确定。
I made an array list
我做了一个数组列表
ArrayList<String> myList = new ArrayList<String>();
but how do I write code to print out the size of myList?
但是如何编写代码来打印出 myList 的大小？
回答by Adam Reed
The size member function.
大小成员函数。
myList.size();
http://docs.oracle.com/javase/6/docs/api/java/util/ArrayList.html
http://docs.oracle.com/javase/6/docs/api/java/util/ArrayList.html
回答by Sergej Raishin
System.out.println(myList.size());
Since no elements are in the list
由于列表中没有元素
output => 0
输出 => 0
myList.add("newString"); // use myList.add() to insert elements to the arraylist
System.out.println(myList.size());
Since one element is added to the list
由于一个元素被添加到列表中
output => 1
输出 => 1
