Java Stack pop()用法及代码示例

Java中的Java.util.Stack.pop()方法用于从堆栈中弹出元素。该元素从堆栈顶部弹出，并从堆栈顶部移除。

用法:

STACK.pop()

参数：该方法不带任何参数。

返回值：此方法返回出现在堆栈顶部的元素，然后将其删除。

异常：如果堆栈为空，则抛出方法EmptyStackException。

以下示例程序旨在说明Java.util.Stack.pop()方法：
示例1:

// Java code to illustrate pop() 
import java.util.*; 
  
public class StackDemo { 
    public static void main(String args[]) 
    { 
        // Creating an empty Stack 
        Stack<String> STACK = new Stack<String>(); 
  
        // Use add() method to add elements 
        STACK.push("Welcome"); 
        STACK.push("To"); 
        STACK.push("Geeks"); 
        STACK.push("For"); 
        STACK.push("Geeks"); 
  
        // Displaying the Stack 
        System.out.println("Initial Stack: " + STACK); 
  
        // Removing elements using pop() method 
        System.out.println("Popped element: " +  
                                         STACK.pop()); 
        System.out.println("Popped element: " +  
                                         STACK.pop()); 
  
        // Displaying the Stack after pop operation 
        System.out.println("Stack after pop peration "
                                             + STACK); 
    } 
}

输出：

Initial Stack: [Welcome, To, Geeks, For, Geeks]
Popped element: Geeks
Popped element: For
Stack after pop peration [Welcome, To, Geeks]

示例2:

// Java code to illustrate pop() 
import java.util.*; 
  
public class StackDemo { 
    public static void main(String args[]) 
    { 
        // Creating an empty Stack 
        Stack<Integer> STACK = new Stack<Integer>(); 
  
        // Use add() method to add elements 
        STACK.push(10); 
        STACK.push(15); 
        STACK.push(30); 
        STACK.push(20); 
        STACK.push(5); 
  
        // Displaying the Stack 
        System.out.println("Initial Stack: " + STACK); 
  
        // Removing elements using pop() method 
        System.out.println("Popped element: " +  
                                         STACK.pop()); 
        System.out.println("Popped element: " +  
                                         STACK.pop()); 
  
        // Displaying the Stack after pop operation 
        System.out.println("Stack after pop operation "
                                             + STACK); 
    } 
}

输出：

Initial Stack: [10, 15, 30, 20, 5]
Popped element: 5
Popped element: 20
Stack after pop operation [10, 15, 30]

相关用法

注：本文由纯净天空筛选整理自Chinmoy Lenka大神的英文原创作品 Stack pop() Method in Java。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。