一、集合

    /**
     * lambda過濾
     */
    @Test
    public void testLambda(){
        Person person1 = new Person();
        person1.setName("aaa");
        person1.setAge(10);
        Person person2 = new Person();
        person2.setName("bbb");
        person2.setAge(20);
        Person person3 = new Person();
        person3.setName("ccc");
        person3.setAge(30);
        List<Person> personList = new ArrayList<>();
        personList.add(person1);
        personList.add(person2);
        personList.add(person3);
        personList.stream().filter(p -> p.getAge() < 20)
                .forEach(p -> {
                    System.out.println(p.getName());
                });
    }
 

    /**
     * lambda排序
     */
    @Test
    public void testLambda1(){
        Person person1 = new Person();
        person1.setAge(22);
        person1.setName("aaa");
        Person person2 = new Person();
        person2.setAge(22);
        person2.setName("bbb");
        Person person3 = new Person();
        person3.setAge(23);
        person3.setName("ccc");
        List<Person> personList = new ArrayList<>();
        personList.add(person1);
        personList.add(person2);
        personList.add(person3);

        personList.stream().sorted(Comparator.comparing(Person::getAge))
                .forEach(person -> {
                    System.out.println(person.getName());
                });
    }
 

        @Test
        public void testGetNameByCourse1(){
            String name =this.getNameByCourse1("java");
            System.out.println(name);
            Assert.assertEquals("老師名字的校驗","xiaoli",name);
        }

        public String getNameByCourse1(String course){
            Teacher teacher1 = new Teacher();
            teacher1.setName("xiaoli");
            teacher1.setCourse("java");
            teacher1.setSex("男");
            Teacher teacher2 = new Teacher();
            teacher2.setName("xiaozhang");
            teacher2.setCourse("selenium");
            teacher2.setSex("女");
            Teacher teacher3 = new Teacher();
            teacher3.setName("xiaowang");
            teacher3.setCourse("appium");
            teacher3.setSex("女");
            Map<String,Teacher> teacherMap1 = new HashMap<>();
            teacherMap1.put("xiaoli",teacher1);
            teacherMap1.put("xiaowanzi",teacher2);
            teacherMap1.put("xiaohu",teacher3);
            String[] name= new String [1];
            teacherMap1.forEach((k,v) -> {
                if(v.getCourse().equals(course)){
                    name[0]=v.getName();
                }
            });
            return name[0];
        }
 

二、IO操作

 public String getFileName(int index) throws IOException {
            File file = new File("d:\\homework");
            File file1 = new File(file.getAbsoluteFile(),"file1.txt");
            File file2 = new File(file.getAbsoluteFile(),"file2.txt");
            File file3 = new File(file.getAbsoluteFile(),"file3.txt");
            file1.createNewFile();
            file2.createNewFile();
            file3.createNewFile();
            File[] files = file.listFiles();
            return files[index-1].getName();
        }

        @Test
        public void mapTest1() throws IOException {
            String fileName= this.getFileName(2);
            Assert.assertEquals("驗證檔名","file2.txt",fileName);
        }

 @Test
        public void fileIo() throws IOException {
            File file = new File("d:\\homework2");
            file.mkdir();
            File file1 = new File(file.getAbsoluteFile(),"temp1.txt");
            file1.createNewFile();
            if(file.exists()){
                System.out.println("建立成功資料夾temp1.txt");
            }
            FileUtils.write(new File("d:\\homework2\\temp1.txt"),"是非得失",true);
            FileUtils.write(new File("d:\\homework2\\temp1.txt"),"好好學習，天天向上",true);
            FileUtils.copyFile(new File("d:\\homework2\\temp1.txt"),new File("d:\\homework2\\temp2.txt"));
        }

三、列舉類

public enum  SexTypeEnum {
    Man("男",1),
    Women("女",2);
    public String key;
    public int value;

    SexTypeEnum(String key, int value) {
        this.key = key;
        this.value = value;
    }

    public String getKey() {
        return key;
    }

    public void setKey(String key) {
        this.key = key;
    }

    public int getValue() {
        return value;
    }

    public void setValue(int value) {
        this.value = value;
    }
}


        @Test
        public void sexTest(){
            int sexType = 1;
            if(sexType== SexTypeEnum.Man.value){
                System.out.println("男");
            }else if(sexType ==SexTypeEnum.Women.value){
                System.out.println("女");
            }
        }