boolean removeAll(Collection<?> c)
描述 (Description)
removeAll(Collection《?》 c)用于删除指定Collection中包含的向量的所有元素。
声明 (Declaration)
以下是java.util.Vector.removeAll()方法的声明
public boolean removeAll(Collection<?> c)
参数 (Parameters)
c - 这是要从Vector中删除的元素的集合
返回值 (Return Value)
如果此Vector因调用而更改，则方法调用返回true。
异常 (Exception)
NullPointerException - 如果指定的collection为null，则抛出此异常。
例子 (Example)
以下示例显示了java.util.Vector.removeAll（）方法的用法。
package com.iowiki;
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
