java特性----增强FOR循环
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
public class ForTest
{
?public static void main(String args[])
?{
??int arr[] = {1, 2, 3, 4, 5, 6, 7, 8};
??/**
???? * 新式写法
???? */
??for (int a : arr)
???System.out.println(a);
??/**
???? * 旧式写法
???? */
??for (int i = 0; i < arr.length; i++)
???System.out.println(arr[i]);
??
??
??String arr2[] = {"好","流","哦","!!"};
??for(String a2 : arr2)
???System.out.println(a2);
??
??
??int arr3[][] = {{1,2,3},{4,5,6,},{7,8,9}};
??for(int a31[] : arr3)
??{
???for(int a32 : a31)
???{?
????System.out.println(a32);
???}
???System.out.println();
??}
??
??
??List<String> list = new ArrayList<String>();
??list.add("好");
??list.add("流");
??list.add("哦");
??list.add("!!");
??/**
?? * 根据集合类长度遍历
?? */
??for(int i=0;i<list.size();i++)
??{
???System.out.println(list.get(i));
??}
??
??
??/**
?? * 根据迭代器遍历
?? */
??for(Iterator i = list.iterator();i.hasNext();)
??{
???System.out.println(i.next());
??}
??
??/**
?? * 根据新式for-each遍历
?? */
??for(String element : list)
???System.out.println(element);
?}
}
?
