java.util.Vector.clone() java.util.Vector.clear() java.util.Vector.contains() 描述 clone() 方法被用来获得的现有vector.The拷贝另一个副本将有一个参考到内部数据阵列的克隆,但不是一个参考到原始内部数据数组。 声明 以下是java.util.Vector.clone()方法的声明 public Object clone() 参数 此方法不接受任何参数作为输入。 返回值 Object - 方法调用返回此向量的克隆作为对象。 异常 CloneNotSupportedException - 如果对象的类不支持Cloneable接口,则抛出此异常。 实例 以下示例显示了java.util.Vector.clone()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); Vector<Integer> vecclone = 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 vec System.out.println("Added numbers in vec vector are :- "); for (Integer number : vec) { System.out.println("Number = " + number); } // let us clone the vector vec vecclone = (Vector)vec.clone(); // let us print all the elements available in vecclone System.out.println("Added numbers in vecclone vector are :-"); for (Integer number : vecclone) { System.out.println("Number = " + number); } } } 让我们编译并运行上面的程序,这将产生以下结果。 Added numbers in vec vector are :- Number = 4 Number = 3 Number = 2 Number = 1 Added numbers in vecclone vector are :- Number = 4 Number = 3 Number = 2 Number = 1 java.util.Vector.clear() java.util.Vector.contains()