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Java ArrayList get()方法

原文: https://beginnersbook.com/2013/12/java-arraylist-get-method-example/

ArrayList get(int index)方法用于从列表中获取元素。我们需要在调用get方法时指定索引,并返回指定索引处的值。

public Element get(int index)

如果索引小于零或大于列表的大小(索引< 0或索引>=列表的大小),则此方法抛出IndexOutOfBoundsException

在下面的例子中,我们通过使用get方法获得了一些arraylist的元素。

package beginnersbook.com;
import java.util.ArrayList;
public class GetMethodExample {
   public static void main(String[] args) {
       ArrayList<String> al = new ArrayList<String>();
       al.add("pen");
       al.add("pencil");
       al.add("ink");
       al.add("notebook");
       al.add("book");
       al.add("books");
       al.add("paper");
       al.add("white board");

       System.out.println("First element of the ArrayList: "+al.get(0));
       System.out.println("Third element of the ArrayList: "+al.get(2));
       System.out.println("Sixth element of the ArrayList: "+al.get(5));
       System.out.println("Fourth element of the ArrayList: "+al.get(3));
   }
}

输出:

First element of the ArrayList: pen
Third element of the ArrayList: ink
Sixth element of the ArrayList: books
Fourth element of the ArrayList: notebook

参考:

ArrayList.get(int)