久久久精品一区ed2k-女人被男人叉到高潮的视频-中文字幕乱码一区久久麻豆樱花-俄罗斯熟妇真实视频

Lambda表達(dá)式的優(yōu)勢(shì)

Lambda表達(dá)式的優(yōu)勢(shì)

1. 匿名內(nèi)部類和Lambda的對(duì)比
//原來的匿名內(nèi)部類
    @Test
    public void test1(){
        Comparator<Integer> comparator = new Comparator<Integer>() {

            @Override
            public int compare(Integer o1, Integer o2) {
                return Integer.compare(o1, o2);
            }
        };

        TreeSet<Integer> ts = new TreeSet<>(comparator);
    }
//Lambda表達(dá)式
    @Test
    public void test2(){
        Comparator<Integer> comparator = (x ,y) -> Integer.compare(x, y);
        TreeSet<Integer> ts = new TreeSet<>(comparator);

    }
2. 用Lambda表達(dá)式優(yōu)化代碼
  • 需求1：獲取當(dāng)前公司中員工年齡大于35的員工信息

  • 需求2：獲取當(dāng)前公司中員工工資大于5000的員工信息

    十年的東麗網(wǎng)站建設(shè)經(jīng)驗(yàn)，針對(duì)設(shè)計(jì)、前端、開發(fā)、售后、文案、推廣等六對(duì)一服務(wù)，響應(yīng)快，48小時(shí)及時(shí)工作處理。網(wǎng)絡(luò)營(yíng)銷推廣的優(yōu)勢(shì)是能夠根據(jù)用戶設(shè)備顯示端的尺寸不同，自動(dòng)調(diào)整東麗建站的顯示方式，使網(wǎng)站能夠適用不同顯示終端，在瀏覽器中調(diào)整網(wǎng)站的寬度，無論在任何一種瀏覽器上瀏覽網(wǎng)站，都能展現(xiàn)優(yōu)雅布局與設(shè)計(jì)，從而大程度地提升瀏覽體驗(yàn)。創(chuàng)新互聯(lián)從事“東麗網(wǎng)站設(shè)計(jì)”,“東麗網(wǎng)站推廣”以來，每個(gè)客戶項(xiàng)目都認(rèn)真落實(shí)執(zhí)行。

    public class Employee {
private String name;
private int age;
private double salary;

public Employee() {
    super();
}

public Employee(String name, int age, double salary) {
    super();
    this.name = name;
    this.age = age;
    this.salary = salary;
}

public String getName() {
    return name;
}

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

public int getAge() {
    return age;
}

public void setAge(int age) {
    this.age = age;
}

public double getSalary() {
    return salary;
}

public void setSalary(double salary) {
    this.salary = salary;
}

@Override
public String toString() {
    return "Employee{" +
            "name='" + name + '\'' +
            ", age=" + age +
            ", salary=" + salary +
            '}';
}
}
    List<Employee> employees = Arrays.asList(
        new Employee("張三", 18 ,9999.99),
        new Employee("李四", 38, 5555.99),
        new Employee("王五", 50, 6666.66),
        new Employee("趙六", 16, 3333.33),
        new Employee("田七", 8, 7777.77)
);
    實(shí)現(xiàn)方式
    @Test
public void test3(){
            //獲取年齡大于35歲的員工信息
    List<Employee> employeeList = filterEmployee(employees);
    System.out.println("年齡大于35歲的員工信息：");
    for (Employee employee : employeeList){
        System.out.println(employee);
    }

    //獲取當(dāng)前公司中員工工資大于5000的員工信息
    List<Employee> employeeList1 = filterEmployees2(employees);
    System.out.println("工資大于5000的員工信息：");
    for (Employee employee : employeeList1){
        System.out.println(employee);
    }
}

獲取當(dāng)前公司中員工年齡大于35的員工信息
public List<Employee> filterEmployee(List<Employee> employeeList){
    List<Employee> emps = new ArrayList<>();

    for (Employee emp : employeeList){
        if (emp.getAge() >= 35){
            emps.add(emp);
        }
    }
    return emps;
}

獲取當(dāng)前公司中員工工資大于5000的員工信息
public List<Employee> filterEmployees2(List<Employee> employeeList){

    ArrayList<Employee> employees = new ArrayList<>();
    for (Employee employee : employeeList){
        if (employee.getSalary() >= 5000){
            employees.add(employee);
        }
    }
    return employees;
}
    優(yōu)化方案一：策略設(shè)計(jì)模式
    public interface MyPredicate<T> {

public boolean test(T t);
}
    public class FilterEmployeeByAge implements MyPredicate<Employee>{
@Override
public boolean test(Employee employee) {
    return employee.getAge() >= 35;
}
}
    public class FilterEmployeeBySalary implements MyPredicate<Employee>{
@Override
public boolean test(Employee employee) {
    return employee.getSalary() >= 5000;
}
}
    @Test
public void test4(){
    List<Employee> employeeList = filterEmployee(employees, new FilterEmployeeByAge());
    System.out.println("年齡大于35歲的員工信息：");
    for (Employee employee : employeeList){
        System.out.println(employee);
    }

    System.out.println("工資大于5000的員工信息：");
    List<Employee> employeeList1 = filterEmployee(this.employees, new FilterEmployeeBySalary());

    for (Employee employee : employeeList1){
        System.out.println(employee);
    }

}
public List<Employee> filterEmployee(List<Employee> employeeList, MyPredicate<Employee> mp){
    ArrayList<Employee> employees = new ArrayList<>();

    for (Employee employee : employeeList){
        if (mp.test(employee)){
            employees.add(employee);
        }
    }
    return employees;
}
    優(yōu)化方案二：匿名內(nèi)部類
    public interface MyPredicate<T> {

public boolean test(T t);
}
    @Test
public void test5(){
    List<Employee> employeeList = filterEmployee(employees, new MyPredicate<Employee>() {
        @Override
        public boolean test(Employee employee) {
            return employee.getAge() >= 35;
        }
    });
    System.out.println("年齡大于35歲的員工信息：");
    for (Employee employee : employeeList){
        System.out.println(employee);
    }

    List<Employee> employeeList1 = filterEmployee(employees, new MyPredicate<Employee>() {
        @Override
        public boolean test(Employee employee) {
            return employee.getSalary() >= 5000;
        }
    });
    System.out.println("工資大于5000的員工信息：");
    for (Employee employee : employeeList1){
        System.out.println(employee);
    }
}
    優(yōu)化方案三：Lambda表達(dá)式
    public List<Employee> filterEmployee(List<Employee> employeeList, MyPredicate<Employee> mp){
    ArrayList<Employee> employees = new ArrayList<>();

    for (Employee employee : employeeList){
        if (mp.test(employee)){
            employees.add(employee);
        }
    }
    return employees;
}
    @Test
public void test6(){
    System.out.println("年齡大于35歲的員工信息：");
    List<Employee> employeeList = filterEmployee(employees, (e) -> e.getAge() >= 35);
    employeeList.forEach(System.out::println);

    System.out.println("工資大于5000的員工信息：");
    List<Employee> employeeList1 = filterEmployee(employees, (e) -> e.getSalary() >= 5000);
    employeeList1.forEach(System.out::println);
}
    優(yōu)化方案四：Lambda表達(dá)式和Stream API
    @Test
public void test7(){
    System.out.println("年齡大于35歲的員工信息：");
    employees.stream()
             .filter((e) -> e.getAge() >= 35)
             .forEach(System.out::println);

    System.out.println("工資大于5000的員工信息：");
    employees.stream()
             .filter((e) -> e.getSalary() >= 5000)
             .forEach(System.out::println);
}

本文標(biāo)題：Lambda表達(dá)式的優(yōu)勢(shì)
URL分享：http://sd-ha.com/article28/ghdijp.html

成都網(wǎng)站建設(shè)公司_創(chuàng)新互聯(lián)，為您提供網(wǎng)站建設(shè)、外貿(mào)建站、電子商務(wù)、域名注冊(cè)、網(wǎng)站策劃、網(wǎng)站設(shè)計(jì)

廣告

聲明：本網(wǎng)站發(fā)布的內(nèi)容（圖片、視頻和文字）以用戶投稿、用戶轉(zhuǎn)載內(nèi)容為主，如果涉及侵權(quán)請(qǐng)盡快告知，我們將會(huì)在第一時(shí)間刪除。文章觀點(diǎn)不代表本網(wǎng)站立場(chǎng)，如需處理請(qǐng)聯(lián)系客服。電話：028-86922220；郵箱：631063699@qq.com。內(nèi)容未經(jīng)允許不得轉(zhuǎn)載，或轉(zhuǎn)載時(shí)需注明來源： 創(chuàng)新互聯(lián)

手機(jī)網(wǎng)站建設(shè)