[Java基础]Stream流综合练习

Posted 2021-08-15 Wecccccccc

代码如下:

package StreamDemoFinal;

public class Actor {
    private String name;

    public Actor(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

package StreamDemoFinal;

import java.util.ArrayList;
import java.util.stream.Stream;

public class StreamTest {
    public static void main(String[] args)
    {
        ArrayList<String> manList = new ArrayList<String>();
        manList.add("周润发");
        manList.add("成龙");
        manList.add("刘德华");
        manList.add("吴京");
        manList.add("周星驰");
        manList.add("李连杰");

        ArrayList<String> womanList = new ArrayList<String>();

        womanList.add("林心如");
        womanList.add("张曼玉");
        womanList.add("林青霞");
        womanList.add("柳岩");
        womanList.add("林志玲");
        womanList.add("王祖贤");

        //男演员只要名字为3个字的前3人
        Stream<String> manStream = manList.stream().filter(s->s.length()==3).limit(3);

        Stream<String> womanStream = womanList.stream().filter(s->s.startsWith("林")).skip(1);

        Stream<String> stream = Stream.concat(manStream, womanStream);

//        stream.map(Actor::new).forEach(System.out::println);
        stream.map(Actor::new).forEach(p->System.out.println(p.getName()));
    }
}

另外一种写法:

代码如下:

package StreamDemoFinal;

import java.util.ArrayList;
import java.util.stream.Stream;

public class StreamTest {
    public static void main(String[] args)
    {
        ArrayList<String> manList = new ArrayList<String>();
        manList.add("周润发");
        manList.add("成龙");
        manList.add("刘德华");
        manList.add("吴京");
        manList.add("周星驰");
        manList.add("李连杰");

        ArrayList<String> womanList = new ArrayList<String>();

        womanList.add("林心如");
        womanList.add("张曼玉");
        womanList.add("林青霞");
        womanList.add("柳岩");
        womanList.add("林志玲");
        womanList.add("王祖贤");

       Stream.concat(manList.stream().filter(s->s.length()==3).limit(3),
               womanList.stream().filter(s->s.startsWith("林")).skip(1)).map(Actor::new).forEach(p->System.out.println(p.getName()));

    }
}