Java 集合 检查LinkedList中是否存在特定元素

在这个例子中,我们将看到如何使用contains()方法检查LinkedList中是否存在特定元素:

public boolean contains(Object o):如果此列表包含指定的元素,则返回true。更正式地,当且仅当此列表包含至少一个元素e时才返回trueo == null? e == null: o.equals(e))。

import java.util.LinkedList;

public class CheckLinkedList {
 public static void main(String[] args) {

    // Creating LinkedList of String Elements
    LinkedList<String> linkedlist = new LinkedList<String>();

    // Populating it with String values
    linkedlist.add("AA");
    linkedlist.add("BB");
    linkedlist.add("CC");
    linkedlist.add("DD");
    linkedlist.add("EE");

    // contains() method checks whether the element exists
    if (linkedlist.contains("CC")) {
       System.out.println("Element CC is present in List");
    } else {
       System.out.println("List doesn't have element CC");
     }

    //Checking for element FF
    if (linkedlist.contains("FF")) {
       System.out.println("Element FF is present in List");
    } else {
        System.out.println("List doesn't have element FF");
      }
 }
}

输出:

Element CC is present in List
List doesn't have element FF
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Java 集合