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堆栈类的capacity()方法用于获取此堆栈的容量。那就是该堆栈容器中存在的元素数。

用法:

public int capacity()

参数:该函数接受参数E obj,它是要在堆栈末尾添加的对象。

返回值:该方法返回整数值,即堆栈的容量

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

示例1:

// Java code to illustrate boolean capacity()

import java.util.*;

import java.util.ArrayList;

public class GFG {

public static void main(String args[])

{

// Creating an empty Stack

Stack stack = new Stack();

// Use add() method to add elements in the Stack

stack.add("Geeks");

stack.add("for");

stack.add("Geeks");

stack.add("10");

stack.add("20");

// Displaying the Stack

System.out.println("The Stack is: " + stack);

// checking capacity

System.out.println("Capacity: "

+ stack.capacity());

}

}

输出:

The Stack is: [Geeks, for, Geeks, 10, 20]

Capacity: 10

示例2:

// Java code to illustrate

// boolean add(Object element)

import java.util.*;

public class StackDemo {

public static void main(String args[])

{

// Creating an empty Stack

Stack stack

= new Stack();

// Use add() method

// to add elements in the Stack

stack.add(10);

stack.add(20);

stack.add(30);

stack.add(40);

stack.add(50);

// Displaying the Stack

System.out.println("The Stack is: " + stack);

// checking capacity

System.out.println("Capacity: "

+ stack.capacity());

}

}

输出:

The Stack is: [10, 20, 30, 40, 50]

Capacity: 10

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