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
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 Person
B
CREATE CLASS student OF Person As mylib
C
CREATE CLASS student OF mylib As Person
D
CREATE CLASS Person OF mylib As student
参考解析
解析：
使用CREATE CLASS命令可以创建新的类库，基本格式为：CREATE CLASS新类名OF新类库名As父类。
使用CREATE CLASS命令可以创建新的类库，基本格式为：CREATE CLASS新类名OF新类库名As父类。
相关考题：
已建立一个名为teacher的类，保存该类的类库名称是mylib，则删除该类正确的命令是（ ）。A)REMOVE CLASS mylib OF teacherB)REMOVE CLASS teacher OF mylibC)DELETE CLASS mylib OF teacherD)DELETE CLASS teacher OF rnylib
（ 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
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
A developer is creating a class Book that needs to access class Paper.The Paper class is deployed in a JARnamedmyLib.jar.Whichthree，taken independently，will allow the developer to use the Paper class while compiling the Book class？（）A.The JAR fileis located at$JAVA_HOME/jre/classes/myLib.jar.B.The JAR fileis located at$JAVA_HOME/jre/lib/ext/myLib.jar.C.TheJ AR fileis located at/foo/myLib.jar and aclasspath environment variable is set that includes /foo/myLib.jar/Paper.class.D.The JAR fileis located at/foo/myLib.jar and a classpath environment variable is set that includes/foo/myLib.jar.E.The JAR file is located at/foo/myLib.jar and the Book class is compiled using javac-cp/foo/myLib.jar/Paper Book.java.F.The JAR file is located at/foo/myLib.jar and the Book class is compiled using javac-classpath/foo/myLib.jar Book.java.
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
创建一个名为myteacher的新类，保存新类的类库名称是mylib，新类的父类是Teacher，正确的命令是 （ ）。A. CREATE CLASS mylib OF myteacher AS TeacherB. CREATE CLASS myteacher OF Teacher AS mylibC. CREATE CLASS myteacher OF mylib AS TeacherD. CREATE CLASS Teacher OF mylib AS myteacher
●以下的SQL 99语句，Student与Person之间的关系是 (62) 。CREATE TYPE Person(name char(20)，address varchar(50))；CREATE TYPE Student(under Person(degree char(20)department char(20)）；(62)A．类型继承B．类型引用C．表继承D．无任何关系
创建一个名为student的新类，保存新类的类库名称是mylib，新类的父类名是Person，正确的命令是（ ）。A.CREATE CLASS mylib OF student AS PcrsonB.CREATE CLASS student OF Person AS mylibC.CREATE CLASS student OF mylib AS PersonD.CREATE CLASS Person OF mylib AS student
下列代码段声明了3个类：classPerson{)；classStudent：publicPerson{}；classUndergraduate：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：//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
要关闭当前处于打开状态的类库文件mylib,可以使用命令（ ）。A)RELEASE CLASSLIB mylibB)RELEASE CLASS mylibC)CLOSE CLASS mylibD)CLOSE CLASSLIB mylib
（ 33 ） 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 P erson, 正确的命令是A ） CREATE CLASS mylib OF student A s P ersonB ） CREATE CLASS student OF P erson A s mylibC ） CREATE CLASS student OF mylib A s P ersonD ） CREATE CLASS P erson OF mylib A s student
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
类Teacher和Student是类Person的子类； Person p； Teacher t； Student s； //p， t and s are all non-null. if（t instanceof Person） { s = （Student）t； } 最后一句语句的结果是：（）A、 将构造一个Student对象；B、 表达式是合法的；C、 表达式是错误的；D、 编译时正确，但运行时错误。
在SQL Sever中，创建数据库student，使用的语句是（）。A、CREATE TABLE studentB、CREATE VIEW studentC、CREATE PROC studentD、CREATE DATABASE student
下列有关类声明的代码片段，哪一项是正确的？（） A、 import java.sql.*； package school； class Student{ }B、 package school； import java.sql.*； class Student{ }C、 package school； class Student{ } import java.sql.*；D、 package school； import java.sql.*；private String name； class Student{ }
对于如下代码，描述正确的是哪项？（） class Student{ public static void main（String[] args）{ Student student=new Student（）； } } A、new Student（）创建了Student对象的一个实例B、Student student声明了对象Student的一个引用C、class Student声明了一个类D、new Student（）创建了一个类E、Student student 声明了一个类
A developer is creating a class Book， that needs to access class Paper. The Paper class is deployed in a JAR named myLib.jar. Which three， taken independently， will allow the developer to use the Paper class while compiling the Book class？（）A、The JAR file is located at $JAVA_HOME/jre/classes/myLib.jarB、The JAR file is located at $JAVA_HOME/jre/lib/ext/myLib.jarC、The JAR file is located at /foo/myLib.jar and a classpath environment variable is set that includes /foo/myLib.jar/Paper.classD、The JAR file is located at /foo/myLib.jar and a classpath environment variable is set that includes /foo/myLib.jarE、The JAR file is located at /foo/myLib.jar and the Book class is compiled using javac –cp /foo/myLib.jar/Paper Book.javaF、The JAR file is located at foo/myLib.jar and the Book class is compiled using javac –classpath /foo/myLib.jar Book.java
对于如下代码，描述正确的是哪项？ （） class Student{ public static void main（String[] args）{ Student student = new Student（）； } } A、Student student 声明了一个类B、new Student（）创建了Student 对象的一个实例C、Student student 声明了对象Student 的一个引用D、class Student 声明了一个类
A developer is creating a class Book, that needs to access class Paper. The Paper class is deployed in a JAR named myLib.jar. Which three, taken independently, will allow the developer to use the Paper class while compiling the Book class?（）A、The JAR file is located at $JAVA_HOME/jre/classes/myLib.jar.B、The JAR file is located at $JAVA_HOME/jre/lib/ext/myLib.jar..C、The JAR file is located at /foo/myLib.jar and a classpath environment variable is set that includes /foo/myLib.jar/Paper.class.D、The JAR file is located at /foo/myLib.jar and a classpath environment variable is set that includes /foo/myLib.jar.E、The JAR file is located at /foo/myLib.jar and the Book class is compiled using javac -cp /foo/myLib.jar/Paper Book.java.F、The JAR file is located at /foo/myLib.jar and the Book class is compiled using javac -d /foo/myLib.jar Book.javaG、The JAR file is located at /foo/myLib.jar and the Book class is compiled using javac -classpath /foo/myLib.jar Book.java
多选题对于如下代码，描述正确的是哪项？（） class Student{ public static void main（String[] args）{ Student student=new Student（）； } }Anew Student（）创建了Student对象的一个实例BStudent student声明了对象Student的一个引用Cclass Student声明了一个类Dnew Student（）创建了一个类EStudent student 声明了一个类
多选题对于如下代码，描述正确的是哪项？ （） class Student{ public static void main（String[] args）{ Student student = new Student（）； } }AStudent student 声明了一个类Bnew Student（）创建了Student 对象的一个实例CStudent student 声明了对象Student 的一个引用Dclass Student 声明了一个类
单选题下列有关类声明的代码片段，哪一项是正确的？（）A import java.sql.*； package school； class Student{ }B package school； import java.sql.*； class Student{ }C package school； class Student{ } import java.sql.*；D package school； import java.sql.*；private String name； class Student{ }
单选题类Teacher和Student是类Person的子类； Person p； Teacher t； Student s； //p， t and s are all non-null. if（t instanceof Person） { s = （Student）t； } 最后一句语句的结果是：（）A 将构造一个Student对象；B 表达式是合法的；C 表达式是错误的；D 编译时正确，但运行时错误。