Java Vector removeAll()用法及代码示例

java.util.vector.removeAll(Collection col)方法用于从向量中删除所有存在于指定集合中的元素。

用法:

Vector.removeAll(Collection col)

参数：此方法接受强制参数col，该参数是要从向量中删除其元素的集合。

返回值：如果向量由于操作而改变，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.Vector.removeAll(Collection col)方法：

示例1:

// Java code to illustrate removeAll() 
import java.util.*; 
  
public class VectorDemo { 
    public static void main(String args[]) 
    { 
  
        // Creating an empty Vector 
        Vector<String> vec_tor = new Vector<String>(); 
  
        // Use add() method to add elements in the Vector 
        vec_tor.add("Geeks"); 
        vec_tor.add("for"); 
        vec_tor.add("Geeks"); 
        vec_tor.add("10"); 
        vec_tor.add("20"); 
  
        // Output the Vector 
        System.out.println("Vector: " + vec_tor); 
  
        // Creating an empty Vector 
        Vector<String> colvec_tor = new Vector<String>(); 
  
        // Use add() method to add elements in the Vector 
        colvec_tor.add("Geeks"); 
        colvec_tor.add("for"); 
        colvec_tor.add("Geeks"); 
  
        // Remove the head using remove() 
        boolean changed = vec_tor.removeAll(colvec_tor); 
  
        // Print the result 
        if (changed) 
            System.out.println("Collection removed"); 
        else
            System.out.println("Collection not removed"); 
  
        // Print the final Vector 
        System.out.println("Final Vector: " + vec_tor); 
    } 
}

输出：

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

示例2:

// Java code to illustrate removeAll() 
import java.util.*; 
  
public class VectorDemo { 
    public static void main(String args[]) 
    { 
  
        // Creating an empty Vector 
        Vector<Integer> vec_tor = new Vector<Integer>(); 
  
        // Use add() method to add elements in the Vector 
        vec_tor.add(1); 
        vec_tor.add(2); 
        vec_tor.add(3); 
        vec_tor.add(10); 
        vec_tor.add(20); 
  
        // Output the Vector 
        System.out.println("Vector: " + vec_tor); 
  
        // Creating an empty Vector 
        Vector<Integer> colvec_tor = new Vector<Integer>(); 
  
        // Use add() method to add elements in the Vector 
        colvec_tor.add(30); 
        colvec_tor.add(40); 
        colvec_tor.add(50); 
  
        // Remove the head using remove() 
        boolean changed = vec_tor.removeAll(colvec_tor); 
  
        // Print the result 
        if (changed) 
            System.out.println("Collection removed"); 
        else
            System.out.println("Collection not removed"); 
  
        // Print the final Vector 
        System.out.println("Final Vector: " + vec_tor); 
    } 
}

输出：

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

相关用法

注：本文由纯净天空筛选整理自kundankumarjha大神的英文原创作品 Vector removeAll() 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。