java.util.ArrayList.clone()%uA0返回此ArrayList实例的浅表副本(即本身是不可复制的元素)。
声明
以下是java.util.ArrayList.clone()方法的声明
public Object clone()
参数
-
NA
返回值
这个方法返回当前ArrayList实例的一个副本。
异常
-
NA
例子
下面的示例演示java.util.Arraylist.clone()方法的用法。
package com.yiibai import java.util.ArrayList public class ArrayListDemo { public static void main(String args[]) { // create an empty array list ArrayList<StringBuilder> arrlist1 = new ArrayList<StringBuilder>() // use add for new value arrlist1.add(new StringBuilder("Learning-")) // using clone to affect the objects pointed to by the references. ArrayList arrlist2 = (ArrayList) arrlist1.clone() // appending the string StringBuilder strbuilder = arrlist1.get(0) strbuilder.append("list1, list2-both pointing to the same StringBuilder") System.out.println("The 1st list prints: ") // both lists will print the same value, printing list1 for (int i = 0 i < arrlist1.size() i++) { System.out.print(arrlist1.get(i) + " ") } System.out.println("The 2nd list prints the same i.e:") // both lists will print the same value, printing list2 for (int i = 0 i < arrlist2.size() i++) { System.out.print(arrlist2.get(i)) } } }
让我们来编译和运行上面的程序，这将产生以下结果：
The 1st list prints: Learning-list1, list2 - both pointing to the same StringBuilder The 2nd list prints the same i.e: Learning-list1, list2 - both pointing to the same StringBuilder