java.util.Vector.removeAll() java.util.Vector.remove() java.util.Vector.removeAllElements() 描述 所述removeAll(Collection<?> c)中用于去除包含在指定Collection中的向量的所有元素。 声明 以下是java.util.Vector.removeAll()方法的声明 public boolean removeAll(Collection<?> c) 参数 c - 这是要从Vector中删除的元素的集合 返回值 如果此Vector因调用而更改,则方法调用返回true。 异常 NullPointerException - 如果指定的collection为null,则抛出此异常。 实例 以下示例显示了java.util.Vector.removeAll()方法的用法。 package com.tutorialspoint; import java.util.Vector; public class VectorDemo { public static void main(String[] args) { // create an empty Vector vec with an initial capacity of 4 Vector<Integer> vec = new Vector<Integer>(4); // use add() method to add elements in the vector vec.add(4); vec.add(3); vec.add(2); vec.add(1); // let us print all the elements available in vector System.out.println("Added numbers are :- "); for (Integer number : vec) { System.out.println("Number = " + number); } System.out.println("Size of the vector: "+vec.size()); // let us remove all the elements System.out.println("Removing all the elements"); vec.removeAll(vec); System.out.println("Size of the vector: "+vec.size()); } } 让我们编译并运行上面的程序,这将产生以下结果。 Added numbers are :- Number = 4 Number = 3 Number = 2 Number = 1 Size of the vector: 4 Removing all the elements Size of the vector: 0 java.util.Vector.remove() java.util.Vector.removeAllElements()