Java中的java.util.Stack.empty()方法用于检查堆栈是否为空。该方法为布尔型,如果堆栈为空,则返回true,否则返回false。
用法:
STACK.empty()
参数:该方法不带任何参数。
返回值:如果堆栈为空,则该方法返回boolean true,否则返回false。
以下程序说明了java.util.Stack.empty()方法的用法:
示例1:
// Java code to demonstrate empty() method
import java.util.*;
public class Stack_Demo {
public static void main(String[] args)
{
// Creating an empty Stack
Stack<String> STACK = new Stack<String>();
// Stacking strings
STACK.push("Geeks");
STACK.push("4");
STACK.push("Geeks");
STACK.push("Welcomes");
STACK.push("You");
// Displaying the Stack
System.out.println("The stack is: " + STACK);
// Checking for the emptiness of stack
System.out.println("Is the stack empty? " +
STACK.empty());
// Popping out all the elements
STACK.pop();
STACK.pop();
STACK.pop();
STACK.pop();
STACK.pop();
// Checking for the emptiness of stack
System.out.println("Is the stack empty? " +
STACK.empty());
}
}
输出:
The stack is: [Geeks, 4, Geeks, Welcomes, You] Is the stack empty? false Is the stack empty? true
示例2:
// Java code to demonstrate empty() method
import java.util.*;
public class Stack_Demo {
public static void main(String[] args)
{
// Creating an empty Stack
Stack<Integer> STACK = new Stack<Integer>();
// Stacking int values
STACK.push(8);
STACK.push(5);
STACK.push(9);
STACK.push(2);
STACK.push(4);
// Displaying the Stack
System.out.println("The stack is: " + STACK);
// Checking for the emptiness of stack
System.out.println("Is the stack empty? " +
STACK.empty());
}
}
输出:
The stack is: [8, 5, 9, 2, 4] Is the stack empty? false
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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 empty() 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。