package lambda;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.List;

import java.util.stream.Collectors;

public class FirstTouchLambda {

    public static void main(String[] args) {

        String[] arr= {"Andy","Bill","Cindy","张三","李四","王五",};

        for(String name:arr) {

            System.out.println(name);

        }

        List<String> nameList = new ArrayList<String>(Arrays.asList(arr));

        // filter

        long n=nameList.stream().filter(name->name.startsWith("张")).count();

        System.out.println("张姓人数:"+n);

        // loop

        nameList.stream().filter(name->{System.out.println(name+":"+name.length());return name.length()>0;}).count();

        // Uppercase

        List<String> ucaseNames=nameList.stream().map(name->name.toUpperCase()).collect(Collectors.toList());

        for(String name:ucaseNames) {

            System.out.println(name);

        }

    }

}

Andy

Bill

Cindy

张三

李四

王五

张姓人数:1

Andy:4

Bill:4

Cindy:5

张三:2

李四:2

王五:2

ANDY

BILL

CINDY

张三

李四

王五