Java Stack capacity()方法与实例

堆栈类的capacity()方法是用来获取这个堆栈的容量。也就是这个堆栈容器中存在的元素数量。

语法

public int capacity()

参数： 该函数接受一个参数E obj，它是要被添加到堆栈末端的对象。

返回值： 该方法返回整数值，该值是堆栈的容量。

下面的程序说明了Java.util.Stack.capacity()方法。

例子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<String> stack = new Stack<String>();
  
        // 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

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<Integer> stack
            = new Stack<Integer>();
  
        // 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