Java Stack pop()方法

Java中的Java.util.Stack.pop()方法用于从堆栈中弹出一个元素。该元素从堆栈的顶部被弹出，并从相同的地方被删除。
语法

STACK.pop()

参数： 该方法不接受任何参数。

返回值： 该方法返回存在于栈顶的元素，然后将其删除。

异常： 如果栈是空的，该方法会抛出EmptyStackException。

以下程序说明了Java.util.Stack.pop()方法：

程序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 operation "
                                             + STACK);
    }
}

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]