1. WIKI教程
2. Java.util包
3. clone clone()

clone clone()

描述 (Description)

clone()方法用于获取现有向量的另一个副本。副本将reference内部数据数组的克隆，但不reference原始内部数据数组。

声明 (Declaration)

以下是java.util.Vector.clone()方法的声明

public Object clone()

参数 (Parameters)

• 此方法不接受任何参数作为输入。

返回值 (Return Value)

Object - 方法调用返回此向量的克隆作为对象。

异常 (Exception)

CloneNotSupportedException - 如果对象的类不支持Cloneable接口，则抛出此异常。

例子 (Example)

以下示例显示了java.util.Vector.clone（）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);
      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