Java程序将值从一个列表复制到另一列表
假设以下是我们的数组-
String[] str = { "P", "Q", "R", "S", "T", "U", "V", "W" };现在将上述数组的元素设置为新的List-
int len = str.length; List<String>list1 = new ArrayList<String>(); for (int i = 0; i < len; i++) list1.add(str[i]);
考虑一个没有元素的新列表-
List<String>list2 = new ArrayList<String>();
for (int i = 0; i < len; i++)
list2.add("");现在将值从一个列表复制到另一个列表-
Collections.copy(list2,list1);
示例
import java.util.ArrayList;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import java.util.ListIterator;
public class Demo {
public static void main(String[] args) {
String[] str = { "P", "Q", "R", "S", "T", "U", "V", "W" };
int len = str.length;
List<String>list1 = new ArrayList<String>();
for (int i = 0; i < len; i++)
list1.add(str[i]);
List<String>list2 = new ArrayList<String>();
for (int i = 0; i < len; i++)
list2.add("");
Collections.copy(list2,list1);
ListIterator<String>iterator = list2.listIterator();
System.out.println("New List...");
while (iterator.hasNext())
System.out.println(iterator.next());
}
}输出结果
New List... P Q R S T U V W