Java中的java.util.ArrayDeque.peekLast()方法用於檢索或獲取雙端隊列的最後一個元素。檢索到的元素不會從Queue中刪除或刪除,該方法僅返回它。如果雙端隊列中沒有元素或該元素為空,則返回Null。
用法:
Array_Deque.peekLast()
參數:該方法不帶任何參數。
返回值:該方法返回雙端隊列的最後一個元素。
下麵的程序演示了Java.util.ArrayDeque.peekLast()方法:
示例1:
// Java code to illustrate peekLast()
import java.util.*;
public class ArrayDequeDemo {
public static void main(String args[])
{
// Creating an empty ArrayDeque
Deque<String> de_que = new ArrayDeque<String>();
// Use add() method to add elements into the Deque
de_que.add("Welcome");
de_que.add("To");
de_que.add("Geeks");
de_que.add("4");
de_que.add("Geeks");
// Displaying the ArrayDeque
System.out.println("Initial ArrayDeque: " + de_que);
// Displaying the last element
System.out.println("The last element is: " +
de_que.peekLast());
// Displaying the ArrayDeque after operation
System.out.println("Final ArrayDeque: " + de_que);
}
}
輸出:
Initial ArrayDeque: [Welcome, To, Geeks, 4, Geeks] The last element is: Geeks Final ArrayDeque: [Welcome, To, Geeks, 4, Geeks]
示例2:
// Java code to illustrate peekLast()
import java.util.*;
public class ArrayDequeDemo {
public static void main(String args[])
{
// Creating an empty ArrayDeque
Deque<Integer> de_que = new ArrayDeque<Integer>();
// Use add() method to add elements into the Deque
de_que.add(10);
de_que.add(15);
de_que.add(30);
de_que.add(20);
de_que.add(5);
// Displaying the ArrayDeque
System.out.println("Initial ArrayDeque: " + de_que);
// Displaying the last element
System.out.println("The last element is: " +
de_que.peekLast());
// Displaying the ArrayDeque after operation
System.out.println("Final ArrayDeque: " + de_que);
}
}
輸出:
Initial ArrayDeque: [10, 15, 30, 20, 5] The last element is: 5 Final ArrayDeque: [10, 15, 30, 20, 5]
示例3:對於空的雙端隊列:
// Java code to illustrate peekLast()
import java.util.*;
public class ArrayDequeDemo {
public static void main(String args[])
{
// Creating an empty ArrayDeque
ArrayDeque<Integer> de_que = new ArrayDeque<Integer>();
// Displaying the ArrayDeque
System.out.println("ArrayDeque: " + de_que);
// Displaying the last element
System.out.println("The last element is: " + de_que.peekLast());
}
}
輸出:
ArrayDeque: [] The last element is: null
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注:本文由純淨天空篩選整理自Chinmoy Lenka大神的英文原創作品 ArrayDeque peekLast() Method in Java。非經特殊聲明,原始代碼版權歸原作者所有,本譯文未經允許或授權,請勿轉載或複製。