• 2021-04-14
    4.6 若有以下程序代码:
    class Person{
    String name,department;
    int age;
    public Person(String n){name=n;}
    public Person(String n, int a){name=n; age=a;}
    public Person(String n, String d, int a ){
    //执行此代码
    }
    下面那个选项可以添加到“//执行此代码”前面( )
  • this(n, a)

    举一反三

    内容

    • 0

      以下代码执行后的结果是: public class Person { String name = “小芳”; public Person(String name) { name = “小兰”; } public void show() { this.name = “小翠”; } public static void main(String[] args) { Person p = new Person(“小凤”); System.out.print(p.name); p.show(); System.out.print(p.name); } }

    • 1

      class Person{} class Student extends Person{ public int id; public int score; public String name; public int getScore() { return score; }

    • 2

      【填空题】public class ThisTest{ private String name; private int age; public ThisTest() { System.out.println("产生一个新的Person对象。"); } public ThisTest (String name, int age) { this(); this.name = name; this.age = age; } public String getInf() { return "姓名:" + name + ",年龄:" + age; } public static void main(String[] args) { ThisTest per = new ThisTest("张三", 20); System.out.println(per.getInf()); } } 运行结果为:____

    • 3

      class Person { String name; int age; [br][/br] public Person(String name, int age) { super(); this.name = name; this.age = age; } @Override public boolean equals(Object obj) { Person person=null; if(obj instanceof Person) person=(Person)obj; if(name.equals(person.name)&&age==person.age) return true; return false; } } class Test{ public static void main(String[] args) { Person person1 = new Person("张三", 12); Person person2 = new Person("张三", 12); System.out.println(person1.equals(person2));//运行结果是? } } 程序运行结果是什么? A: true B: false

    • 4

      阅读下面代码: Person 类: public class Person { private String name; public String getName() { return name; } public void setName(String name) { this.name = name; } } Servlet1: request.getSession().setAttribute("name","zhangsan"); Person p = new Person(); p.setName("lisi"); request.getSession().setAttribute("person",p); Servlet2: String name1 = (String)request.getSession().getAttribute("name"); Person p = (Person)request.getSession().getAttribute("person"); response.getWriter().write(name1); if(p!=null)response.getWriter().write(p.getName()); 浏览器先访问Servlet1,再去访问Servlet2,输出的结果是:()