List集合遍历的五种方式
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;
public class listTest {
public static void main(String[] args) {
List<String> list = new ArrayList<>();
list.add("张三");
list.add("李四");
list.add("王五");
list.add("赵六");
//普通for循环遍历
for (int i = 0; i < list.size(); i++) {
System.out.println(list.get(i));
}
//增强for循环遍历
for (String s : list) {
System.out.println(s);
}
//Iterator接口
Iterator<String> iterator = list.iterator();
while (iterator.hasNext()){
System.out.println(iterator.next());
}
//迭代器
ListIterator<String> stringListIterator = list.listIterator();
while(stringListIterator.hasNext()){
System.out.println(stringListIterator.next());
}
//Stream流Lambda
//对list集合过滤,只要以"张"开头的元素,储存到新集合listA中
//对listA集合过滤,只要长度为2的元素,储存到新集合listB中
//遍历listB集合
list.stream().filter(Name-> Name.startsWith("张")).filter(Name-> Name.length()==2).forEach(System.out::println);
}

