设有下面两个类的定义。 class Person { long id; // 身份证号 String name; // 姓名 } class Student extends Person { int score; // 入学总分 } intgetScore() { return score;} } 则类Person和类Student的关系是? } A.包含关系B.继承关系C.关联关系D.上述类定义有语法错误
设有下面两个类的定义。 class Person { long id; // 身份证号 String name; // 姓名 } class Student extends Person { int score; // 入学总分 } intgetScore() { return score;} } 则类Person和类Student的关系是? }
A.包含关系
B.继承关系
C.关联关系
D.上述类定义有语法错误
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能将程序补充完整的选项是( )。class Person{ private int a; public int change(int m){ return m; }}public class Teacher extends Person{ public int b; public static void main(String arg[]) { Person p = new Person(); Teacher t = new Teacher(); int i; ______ }} B.A.i=mB.i=bC. i=p.aD.i=p. change(50)
( 30 )下列代码声明了 3 个类class Person{};class Student:public Person{};class Undergraduate:Student{};下列关于这些类之间关系的描述中,错误的是A )类 Person 是类 Undergraduate 的基类B )类 Undergraduate 从类 Student 公有继承C )类 Student 是类 Person 的派生类D )类 Undergraduate 是类 Person 的派生类
设有下列两个类的定义,则类Person和类Man的关系是( )。 class Person { long id; //身份证号 String name; //姓名 } class Man extends Person { int age; //年龄 int getAge() { return age; } }A.包含关系B.继承关系C.关联关系D.无关系,上述类定义有语法错误
下列代码段声明了3个类:class Person();class Student:public Person{};class Undergraduate:Student{};下列关于这些类之间关系的描述中,错误的是( )。A.类Person是类Undergraduate的基类B.类Undergraduate从类Student公有继承C.类Student是类Person的派生类D.类Undergraduate是类Person的派生类
给出下列的不完整的类代码,则哪个语句可以被加到横线处? ( ) class Person{ String name,department; int age; public Person(String n){name=n;} public Person(String n,int s){name=n; age=a;} public Person(String n,String d,int a){ department=d;______ } }A.Person(n,a);B.this(Person(n,a));C.this(n,s);D.this(name,age);
使用VC6打开考生文件夹下的工程test4_3。此工程包含一个源程序文件test4_3.cpp,其对一个学校的教师和考生情况进行了描述。由于教师和考生之间有相同的信息,如姓名、年龄等,所以可抽象出一个基类person,考生类student和教师类teacher作为person类的派生类。请按要求完成下列操作,将程序中的类定义补充完整。(1)定义基类person的私有数据成员name和age,分别用于表示姓名和年龄,name为字符指针,age为血型的数据。请在注释“//**1**”之后添加适当的语句。(2)完成基类person的重载构造函数person(char *mint a)的定义,把数据成员name,age分别初始化为参数n,a的值,请在注释“//**2**”之后添加适当的语句。(3)根据主函数main中对s1的声明,定义派生类student的构造函数。在注释“//**3**”之后添加适当的语句。(4)完成派生类teacher成员函数void setinf(ehar *n,int a,char *d,char *1)的定义,其功能为记录教师的姓名、年龄、院,系与职称信息。请在注释“//**4**”之后添加适当的语句。输出结果如下:刘雷(45)destructor蒋军(23)destructor注意:除在指定位置添加语句之外,请不要改动程序中的其他内容。源程序文件test4_3.cpp清单如下:include<iostream.h>class person{//**1**public:person(){}person(char *n,int a){//**2**}void setname(char *n){name=n;)void setage(int a){age=a;}~person(){cout<<name<<"("<<age<<")destructor"<<endl;)};class student:public person{char *department;int code;public://**3**{department=d;code=c;}};class teacher:public person{char *department;char *level;public:teacher(){}void setinf(char *n,int a,char *d,char *1){//**4**department=d;level=1;}};void main(){student s1("蒋军",23,"计算机学院",2);teacher t1;t1.setinf("刘雷",45,"计算机学院","教授");}
设有下面两个类的定义:classperson{longid;//身份证号stringname;//姓名}classstudentextendsperson{intscore;//入学总分intgetscore(){returnscore;}}则类person和类student的关系是_________。 A.关联关系B.上述类定义有语法错误C.继承关系D.包含关系
下列程序运行后的输出结果是( )。#include#includeusing namespace std;class Person{public:Person(string n):name(n) { coutprivate:int year,month,day;};class Student:public Person{public:Student(string n,int y,int m,int d,char c):birthday(y,m,d),sex(c),Person(n) { coutA. SB.PSC.DPSD.PDS
创建一个名为student的新类,保存新类的类库名称是mylib,新类的父类是Person,正确的命令是A.CREATE CLASS mylib OF student As PemonB.CREATE CLASS student OF Pe~on As mylibC.CREATE CLASS student 0F mylib As Pe~onD.CREATE CLASS Person OF mylib As student
阅读下面代码 abstract class Person { public Person(String n) { name=n; } public______String getDescription(); public String getName() { return name; } private String name; } 在下画线处应填入的修饰符是A.staticB.abstractC.protectedD.final
给出下列的不完整的类代码,则下列的( )语句可以加到横线处。 class Person{ String name,department; int age public Person(String n){name=n;} public Person(String n,int a){name=n;age=a;} pubilc Person(String n,String d,int a) { _______________ department=d; } }A.Person(n,a);B.this(Person(n,a));C.this(n,a);D.this(name,age);
给出下面不完整的类代码,则横线处的语句应该为( )。 class Person { String name,department; int age; public Person (Strings) {name=s;} public Person (String s,intA.{name=s;age=a;} public Person (String n,String d,intA){ __________ department=d; } }A)Person (n,A);B.this (Person(n,A));C.this(n,A);D.this(name,age);
设有下列两个类的定义,则类Person和类Man的关系是 ( ) class Person{ long id;//身份证号 Stringname;//姓名 } class Man extends Person{ int age;//年龄 int getScore(){ return score; } }A.包含关系B.继承关系C.关联关系D.无关系,上述类定义有语法错误
设有下面两个类的定义: class Person{ long id // 身份证号 String name; //姓名 } class Student extends Person{ int score: //成绩 int getScore ( ) { return score; } } 则类Person和类Student的关系是( )。A.包含关系B.继承关系C.关联关系D.无关系
阅读以下说明和Java 码,将应填入(n)处的字名写在的对应栏内。[说明] 编写一个学生类Student,要求:(1) 学生类Student 属性有:id: long 型,代表学号name: String类对象,代表姓名age: int 型,代表年龄sex: boolen 型,代表性别(其中:true 表示男,false 表示女)phone: String 类对象,代表联系电话(2) 学生类Student 的方法有:Student (long i,String n,int a,boolean s,String p):有参构造函数,形参表中的参数分别初始化学号、姓名、年龄、性别和联系电话。int getAge ():获取年龄作为方法的返回值。boolean getSex ():获取性别作为方法的返回值。String getPhone ():获取联系电话作为方法的返回值。public String to String ():以姓名:性别:学号:联系电话的形式作为方法的返import java. applet. Applet;import java. awt.* ;public class Student extends Applet {long id;String name, phone;int age;boolean sex;Student(long i, String n, int a, boolean s, String p){id=i;name = n;age = a;sex= s;phone = p;{public void paint( Graphics g){Student x= new Student (5000," xiaoliu" , 89, true, " 8989898" );(1);(2)g. drawstring( x. getPhone( ), 140,140);}int getAge( ){ return age; }boolean getsex ( ){ return sex; }String getPhone( ){ return phone; }String ToString( ){(3)}}
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要求:1. 按如下类图写出相应数据库建表 sql 脚本。 其中 Student 和 Score 是1 对多的关系,Scroe 和 Course是多对 1 的关系。Student-id: String-name: String-birthday: Date-address: String-phone: String-email: StringScore-student: Student-course: Course-grade: floatCourse-id: String-name: String-description: String
设有下列两个类的定义,则类Person和类Man的关系是 ( ) class Person { long id; //身份证号 String name; //姓名 } class Man extends Person{ int age;//年龄 int getScore() { return score; } }A.包含关系B.继承关系C.关联关系D.无关系,上述类定义有语法错误
public class Person { private String name, comment; private int age; public Person(String n, int a, String c) { name = n; age = a; comment = c; } public boolean equals(Object o) { if(! (o instanceof Person)) return false; Person p = (Person)o; return age == p.age name.equals(p.name); } } What is the appropriate definition of the hashCode method in class Person?() A、 return super.hashCode();B、 return name.hashCode() + age * 7;C、 return name.hashCode() + comment.hashCode() /2;D、 return name.hashCode() + comment.hashCode() / 2 - age * 3;
类Student代码如下: class Student{ String name; int age; Student(String nm){ name = nm; } } 执行语句Student stu = new Student()后,字段age的值是哪项?() A、 0B、 nullC、 falseD、 编译错误
在C#中,假设Person是一个类,而ITeller是一个接口,下面的()类声明是正确的。A、class Employee:Person,ITeller B、class Employee:ITeller,PersonC、class Employee-Person,ITellerD、class Employee:Person / ITeller
单选题类Student代码如下: class Student{ String name; int age; Student(String nm){ name = nm; } } 执行语句Student stu = new Student()后,字段age的值是哪项?()A 0B nullC falseD 编译错误
多选题Which are syntactically valid statement at// point x?() class Person { private int a; public int change(int m){ return m; } } public class Teacher extends Person { public int b; public static void main(String arg[]){ Person p = new Person(); Teacher t = new Teacher(); int i; // point x } }Ai = m;Bi = b;Ci = p.a;Di = p.change(30);Ei = t.b.
单选题创建一个名为student的新类,保存新类的类库名称是mylib,新类的父类是Person,正确的命令是( )。ACREATE CLASS mylib OF student As PersonBCREATE CLASS student OF Person As mylibCCREATE CLASS student OF mylib As PersonDCREATE CLASS Person OF mylib As student
单选题public class Person { private String name, comment; private int age; public Person(String n, int a, String c) { name = n; age = a; comment = c; } public boolean equals(Object o) { if(! (o instanceof Person)) return false; Person p = (Person)o; return age == p.age name.equals(p.name); } } What is the appropriate definition of the hashCode method in class Person?()A return super.hashCode();B return name.hashCode() + age * 7;C return name.hashCode() + comment.hashCode() /2;D return name.hashCode() + comment.hashCode() / 2 - age * 3;
单选题Given the uncompleted code of a class: 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) { // doing the same as two arguments version of constructor // including assignment name=n,age=a department = d; } } Which expression can be added at the "doing the same as..." part of the constructor?()A Person(n,a);B this(Person(n,a));C this(n,a);D this(name,age);