Java Stack trimToSize()用法及代码示例

Java中的trimToSize()方法可以将Stack实例的容量调整为列表的当前容量。此方法用于将Stack实例修剪为包含的元素数量。

用法:

public void trimToSize()

参数：它不接受任何参数。

返回值：它不返回任何值。它将此Stack实例的容量调整为它包含的元素数。

以下示例程序旨在说明trimToSize()方法：

// Java code to demonstrate the working of 
// trimToSize() method in Stack 
  
// for Stack functions 
import java.util.Stack; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // Creating object of Stack<Integer> 
        Stack<Integer> 
            stack = new Stack<Integer>(); 
  
        // adding element to stack 
        stack.add(10); 
        stack.add(20); 
        stack.add(30); 
        stack.add(40); 
  
        // Print the Stack 
        System.out.println("Stack: " + stack); 
  
        // Print the current capacity of Stack 
        System.out.println("Current capacity of Stack: "
                           + stack.capacity()); 
  
        // Change the capacity to 15 
        stack.ensureCapacity(15); 
  
        // Print the current capacity of Stack 
        System.out.println("New capacity of Stack: "
                           + stack.capacity()); 
  
        // trims the capacity to the number of elements 
        stack.trimToSize(); 
  
        // Print the current capacity of Stack 
        System.out.println("Current capacity of Stack"
                           + " after use of trimToSize() method: "
                           + stack.capacity()); 
    } 
}

输出：

Stack: [10, 20, 30, 40]
Current capacity of Stack: 10
New capacity of Stack: 20
Current capacity of Stack after use of trimToSize() method: 4

示例2:

// Java program to demonstrate 
// Stack toString() method 
  
import java.util.*; 
  
public class collection { 
    public static void main(String args[]) 
    { 
        // Creating an Empty Stack 
        Stack<String> stack 
            = new Stack<String>(); 
  
        // Use add() method 
        // to add elements to the Collection 
        stack.add("Welcome"); 
        stack.add("To"); 
        stack.add("Geeks"); 
        stack.add("For"); 
        stack.add("Geeks"); 
  
        // Print the Stack 
        System.out.println("Stack: " + stack); 
  
        // Print the current capacity of Stack 
        System.out.println("Current capacity of Stack: "
                           + stack.capacity()); 
  
        // Change the capacity to 20 
        stack.ensureCapacity(20); 
  
        // Print the current capacity of Stack 
        System.out.println("New capacity of Stack: "
                           + stack.capacity()); 
  
        // trims the capacity to the number of elements 
        stack.trimToSize(); 
  
        // Print the current capacity of Stack 
        System.out.println("Current capacity of Stack"
                           + " after use of trimToSize() method: "
                           + stack.capacity()); 
    } 
}

输出：

Stack: [Welcome, To, Geeks, For, Geeks]
Current capacity of Stack: 10
New capacity of Stack: 20
Current capacity of Stack after use of trimToSize() method: 5

相关用法

注：本文由纯净天空筛选整理自Code_r大神的英文原创作品 Stack trimToSize() method in Java with Example。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。