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( )
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( )
举一反三
- (6-2)定义如下Person类,(1)处合理的代码是。 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, int a, String d) { ① department = d; } }
- 中国大学MOOC: public 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 ){ //调用2个参数的构造函数 department=d; }}
- 在C#中,下列结构或者类定义正确的是(选一项) A: public struct Person{ string name; int age; public void ShowName(){ Console.WriteLine(name); }} B: public struct Person{ string name; int age; public Person(){ Conssole.WriteLine(name); }} C: public class Person{ string name; int age; public Person(){ Conssole.WriteLine(name); }} D: public class Person{ string name; int age; public Person(string name){ Conssole.WriteLine(name); }}
- 分析下面的程序,输出的结果是? public class Test { public static void main(String[] args) { final Person p = new Person("张三", 23); p.setName("李四"); p.setAge(24); System.out.println(p); } } class Person { private String name; private int age; public Person() { super(); } public Person(String name, int age) { super(); this.name = name; this.age = age; } 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; } @Override public String toString() { return "我的姓名是:" + name + ",我的年龄是:" + age ; } }
- 给定如下代码,要在第三个构造方法的空白处填上一行代码使之能够调用第二个构造方法,这行代码应该是() class Circle{ String name,radius; int r; public Circle(String n){ name=n; } public Circle(String n,int a){ name=n; r=a; } public Circle(String n,String d,int a){ radius=d; } }