Java 集合 删除Vector中所有元素

import java.util.Vector;
public class RemoveAll {
 public static void main(String[] args) {

    // Creating a Vector of Strings
    Vector<String> vector = new Vector<String>();

    //Adding elements to the Vector
    vector.add("C++");
    vector.add("Java");
    vector.add("Cobol");
    vector.add("C");
    vector.add("Oracle");

    System.out.println("Current size of Vector: "+vector.size());

    // Calling clear() method of Vector API
    vector.clear();

    System.out.println("Size of Vector after clear(): "+vector.size());
 }
}

Current size of Vector: 5
Size of Vector after clear(): 0