Java Stack removeAll()用法及代码示例

Java.util.Stack.removeAll(Collection col)方法用于从堆栈中删除所有存在于指定集合中的元素。

用法:

Stack.removeAll(Collection col)

参数：此方法接受强制性参数col，该参数是要从堆栈中删除其元素的集合。

返回值：如果由于操作而改变了堆栈，则此方法返回true，否则返回False。

异常：如果指定的集合为null，则该方法引发NullPointerException。

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

示例1:

// Java code to illustrate removeAll() 
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 in the Stack 
        stack.add("Geeks"); 
        stack.add("for"); 
        stack.add("Geeks"); 
        stack.add("10"); 
        stack.add("20"); 
  
        // Output the Stack 
        System.out.println("Stack: " + stack); 
  
        // Creating an empty Stack 
        Stack<String> colstack = new Stack<String>(); 
  
        // Use add() method to add elements in the Stack 
        colstack.add("Geeks"); 
        colstack.add("for"); 
        colstack.add("Geeks"); 
  
        // Remove the head using remove() 
        boolean changed = stack.removeAll(colstack); 
  
        // Print the result 
        if (changed) 
            System.out.println("Collection removed"); 
        else
            System.out.println("Collection not removed"); 
  
        // Print the final Stack 
        System.out.println("Final Stack: " + stack); 
    } 
}

输出：

Stack: [Geeks, for, Geeks, 10, 20]
Collection removed
Final Stack: [10, 20]

示例2:

// Java code to illustrate removeAll() 
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(1); 
        stack.add(2); 
        stack.add(3); 
        stack.add(10); 
        stack.add(20); 
  
        // Output the Stack 
        System.out.println("Stack: " + stack); 
  
        // Creating an empty Stack 
        Stack<Integer> colstack = new Stack<Integer>(); 
  
        // Use add() method to add elements in the Stack 
        colstack.add(30); 
        colstack.add(40); 
        colstack.add(50); 
  
        // Remove the head using remove() 
        boolean changed = stack.removeAll(colstack); 
  
        // Print the result 
        if (changed) 
            System.out.println("Collection removed"); 
        else
            System.out.println("Collection not removed"); 
  
        // Print the final Stack 
        System.out.println("Final Stack: " + stack); 
    } 
}

输出：

Stack: [1, 2, 3, 10, 20]
Collection not removed
Final Stack: [1, 2, 3, 10, 20]

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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 removeAll() 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。