/*

* Copyright 2021 tu.cn All right reserved. This software is the

* confidential and proprietary information of tu.cn ("Confidential

* Information"). You shall not disclose such Confidential Information and shall

* use it only in accordance with the terms of the license agreement you entered

* into with Tu.cn

*/

package com.ariix.java8.optional;

import com.ariix.java8.lambda.Employee;

import org.junit.Test;

import java.util.Optional;

/**

* Description:

*

* @Author: Administrator

* Created: 2021/8/16

**/

public class OptionalTest {

@Test

public void testOf() {

Optional<Integer> result = Optional.of(1);

System.out.println("是否有值" + result.isPresent());

}

@Test

public void testElse() {

Optional<Integer> result = Optional.empty();

System.out.println("是否有值" + result.isPresent() + ", 如果没有值默认为"+ result.orElse(18));

}

@Test

public void testOfNullable() {

//允许把控制方法容器里

Optional<Employee> itWorker = Optional.ofNullable(null);

System.out.println("是否有IT 部分员工参与" + itWorker.isPresent());

}

private Optional<Employee> getItWorkder() {

return Optional.ofNullable(null);

}

@Test

public void testOrEleseGet () {

Optional<Employee> itWorker = getItWorkder();

if (itWorker.isPresent()) {

System.out.println(itWorker.toString() + " joins");

} else {

Employee employee = itWorker.orElseGet(() -> new Employee("jed", 52, 9865.85));

System.out.println(employee.toString() + " joins ");

}

}

@Test

public void testFlatmap() {

Optional<String> employee = Optional.of(new Employee("jed", 52, 9865.85))

.flatMap(employee1 -> Optional.of(employee1.getName()));

System.out.println(employee.get());

Optional<Employee> optionalEmployee = Optional.empty();

Optional<String> mvpName = optionalEmployee.flatMap(employee1 -> Optional.of(employee1.getName()));

System.out.println(mvpName.orElse("No One is MVP"));

}

}