Java8 Stream学习

先建立一个实体模型

public class PersonModel {

	private String name;
	private Integer age;
	private String gender;
	public PersonModel() {
		super();
		// TODO Auto-generated constructor stub
	}
	public PersonModel(String name, Integer age, String gender) {
		super();
		this.name = name;
		this.age = age;
		this.gender = gender;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public Integer getAge() {
		return age;
	}
	public void setAge(Integer age) {
		this.age = age;
	}
	public String getGender() {
		return gender;
	}
	public void setGender(String gender) {
		this.gender = gender;
	}
	@Override
	public String toString() {
		return "PersonModel [name=" + name + ", age=" + age + ", gender=" + gender + "]";
	}
	

}

建立一个假的数据库

package cn.entity;

import java.util.Arrays;
import java.util.List;

public class Data {
	private static List<PersonModel> list = null;
	static {
		PersonModel yi= new PersonModel("张三", 18, "男");
		PersonModel er= new PersonModel("李四", 19, "男");
		PersonModel san= new PersonModel("王五", 20, "女");
		PersonModel si= new PersonModel("赵柳", 20, "男");
		PersonModel wu= new PersonModel("天气", 21, "男");
		list = Arrays.asList(yi, er, san, si, wu);
	}

	public static List<PersonModel> getData() {
		return list;
	}

}

测试,过滤所有女性

package cn.test;

import java.util.List;
import java.util.stream.Collectors;

import cn.entity.Data;
import cn.entity.PersonModel;

public class Test16 {

	public static void main(String[] args) {

		List<PersonModel> data = Data.getData();
		System.out.println(data);
		//过滤所有的男性
		List<PersonModel> collect = data.stream().filter(p -> "女".equals(p.getGender())).collect(Collectors.toList());
		System.out.println(collect);
		

	}

}