stream排序、筛选、截取、统计等操作

简单举例介绍比较方便不复杂的Stream流方法,提升编程效率

public class StreamTest {
	
	public static void main(String[] args) {
		List<TestData>mlist = new ArrayList<TestData>();
		
		TestData data;
		//字段名为name,time,age
		data = new TestData("大毛", "2020-01-01",21);
		mlist.add(data);
		data = new TestData("二毛", "2020-02-08",12);
		mlist.add(data);
		data = new TestData("三毛", "",23);
		mlist.add(data);
		data = new TestData("四毛", "2020-03-03",17);
		mlist.add(data);
		List<TestData> squaresList = mlist.stream()
		//下面是筛选
        .filter(o -> !o.getTime().contains("08"))
        .filter(o -> !o.getTime().isEmpty())
        //下面是排序
        .sorted(Comparator.comparing(TestData::getTime).reversed())
        .sorted((o1,o2) -> o1.getAge()-o2.getAge())
        //下面这一行把list列表数据返回，不写就是一个布尔类型结果返回
        .collect(Collectors.toList())
        //下面是截取,只取结果种的前两条数据
        .subList(0,2);
	}
}
 

本文地址：https://blog.csdn.net/whlqunzhu/article/details/107692996