Question

一个string类型的list集合 转换成String的数组 写代码

Answer 1

import java.util.*;

public class TestList {
public static void main(String[] args) {
List<String> list = new ArrayList<String>();
list.add("String1");
list.add("String2");
list.add("String3");
String[] str = list.toArray(new String[0]); //重点在这，查询API文档，
for(String s : str) {
System.out.println(s);
}
}

}

Answer 2

LinkedList<String> list = new LinkedList<String>();
list.add("a");
list.add("a");
list.add("a");
list.add("a");
list.addFirst("b");
list.addLast("cc");
System.out.println(list);
System.out.println(list.getFirst());
System.out.println(list.getLast());

//Object[]
Object array[] = list.toArray();
for(int i = 0;i<array.length;i++){
System.out.println(array[i]);
}