Java Deque peekLast() 方法

2025 年 3 月 22 日 | 阅读需 2 分钟

Java Deque 接口的 peekLast() 方法检索但不移除给定双端队列的最后一个元素。但是，如果双端队列为空，它可能会返回 null。

语法

参数

不适用

上述方法用于返回给定双端队列的尾部。另一方面，如果双端队列为空，该方法可能会返回 null。

示例 1

import java.util.ArrayDeque;
import java.util.Deque;
public class JavaDequepeekLastExample1 {
  public static void main(String[] args) {
	  Deque<Character> deque = new ArrayDeque<>();
	  deque.offer('J');
	  deque.offer('A');
	  deque.offer('V');
	  deque.offer('A');
	  Character val = deque.peekLast();
   System.out.println("The last character is given as : "+val);   
   System.out.println("The final deque is given as : ");   
	for (Character character : deque) {
		System.out.println(character);
    	}
     }
  }   

输出

The last character is given as : A
The final deque is given as : 
J
A
V
A

示例 2

import java.util.ArrayDeque;
import java.util.Deque;
public class JavaDequepeekLastExample2 {
   public static void main(String[] args) {
	   Deque<String> deque = new ArrayDeque<>();
		  deque.offer("Java");
		  deque.offer("is");
		  deque.offer("a");
		  deque.offer("secured");
		  deque.offer("language");
		  String val = deque.peekLast();
		System.out.println("The last string value is given as : "+val);			    
		System.out.println("The final deque is given as : "+deque);    
	     }
	  }   

输出

The last string value is given as : language
The final deque is given as : [Java, is, a, secured, language]

示例 3

import java.util.ArrayDeque;
import java.util.Deque;
public class JavaDequepeekLastExample3 {
   public static void main(String[] args) {
	   Deque<Integer> deque = new ArrayDeque<>();
		  deque.offer(1);
		  deque.offer(2);
		  deque.offer(3);
		  deque.offer(4);
		  deque.offer(5);
		  int val = deque.peekLast();
		System.out.println("The last integer value is given as : "+val); 
		System.out.println("The final deque is given as : ");
		for (Integer integer : deque) {
			System.out.println(integer);
	     	}
	     }
	  }  

输出

The last integer value is given as : 5
The final deque is given as : 
1
2
3
4
5

下一主题Java Deque

Java Deque peekLast() 方法

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示例 2

示例 3

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Java Deque peekLast() 方法

语法

参数

返回

示例 1

示例 2

示例 3

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