创建Person类对象的语句正确的是 public class Person{ private int age; private Stri

1. 以下说法正确的是 public class Person{ private int age; private String name; publicint getAge(){ return age; } public String getName(){ return name; } public void setAge(int age){ this.age = age; } public void setName(String name){ this.name = name; } public void show(){ System.out.println("姓名:"+name+",age"+age); } } public class TestPerson{ public static void main(String[] args){ Person p = new Person(); } } 选项： A、 p能调用的方法有setAge(int),getAge(),setName(String),setAge(int) B、 p是Person类的对象 C、 p能调用的方法有Person() D、 p.setName("Tom")能把p的姓名属性赋值为Tom

2.有类Person的定义如下，创建对象的语句正确的有（） class Person{ int age; String name; public Person(int age){ this.age = age; } public Person(String name){ this.name = name; } public void Person(int age, String name){ this.age = age; this.name = name; } } 选项： A、Person p = new Person（）; B、Person p = new Person(10); C、Person p = new Person( "tom"); D、Person p = new Person( 10, "tom");

3.Public class Person { String name; int age=25; public Person(String name){ this(); //line nl setName(name); }Public Person(string name, int age){ Person(name); //line n2 setAge(age); } //setter and getter methods go here public String show(){ return name+" "+ age; } public static void main(String ] args) { Person pl=new Person("Jesse"); Person p2=new Person("Walter",52); System.out.printIn(p1.show()); System.out.println(p2.show()); }} What is the result? 选项： A: Compilation fails only at line n1. B:Compilation fails at both line nl and line n2. C: Compilation fails only at line n2. D: Jesse 25 Walter 52

4.给出程序的运行结果（） class Person { String name; int age; Person(){ System.out.println("Person()"); } void Person(){ System.out.println("method()"); } public void tell() { System.out.println("姓名：" + name + "，年龄：" + age); } } public class ClassTest02 { public static void main(String[] args) { Person person = new Person(); person.name = "张三"; person.age = 30; person.tell(); } }

5.类Person中定义构造方法public Person(String name,int age) {this.name=name; this.age=age; }下列对此构造方法应用正确的是( )选项： A:Person p=new Person(); ; B:Person p=Person(“zhangsan”); ; C:Person p=new Person(“zhangsan”,20); ; D:Person p=Person(zhangsan,20);

6.【填空题】阅读下面的程序,写出程序的运行结果: //filename:App8_2.java 调用父类中的特定构造方法 class Person { private String name; private int age; public Person() { System.out.println("调用了Person类的无参构造方法"); } public Person(String name, int age) { System.out.println("调用了Person类的有参构造方法"); this.name=name; this.age=age; } public void show() { System.out.println("姓名:" name " 年龄:" age); } } class Student extends Person { private String department; public Student() { System.out.println("调用了学生类的无参构造方法Student()"); } public Student (Strin

7.以下代码运行输出的是class Person{ private String name = "Person"; int age=0;}public class Child extends Person{ public String grade; public static void main(String[] args){ Person p = new Child(); System.out.println(p.name); }}选项： A:Person; B:没有输出; C:编译出错; D:运行出错

8.以下代码运行输出是（）public class Person{private String name=”Person”;int age=0;}public class Child extends Person{public String grade;public static void main(String[] args){Person p = new Child();System.out.println(p.name);}}选项： A:输出：Person; B:没有输出; C:编译出错; D:运行出错

9.47．以下代码运行输出是（） public class Person{ private String name=”Person”; int age=0; } public class Child extends Person{ public String grade; public static void main(String] args){ Person p = new Child(); System.out.println(p.name); } } A) 输出：Person B) 没有输出 C) 编译出错 D) 运行出错

10.给出程序的运行结果（）class Person { String name; int age; Person(){ System.out.println("Person()"); } void Person(){ System.out.println("method()"); } public void tell() { System.out.println("姓名：" + name + "，年龄：" + age); } }public class ClassTest02 { public static void main(String[] args) { Person person = new Person(); person.name = "张三"; person.age = 30; person.tell(); }}选项： A:Person()姓名：张三，年龄：30 B:姓名：张三，年龄：30 C:Person()method()姓名：张三，年龄：30 D:method()姓名：张三，年龄：30

11.请阅读下面的程序，程序的运行结果是（）。 Class Person { String name; int age; public Person() {} public Person(String n, int a) { name = n; age = a; } public void show() { System.out.print(name + "---" + age +" "); } } Public class Test { public static void main(String] args) { Person p1 = new Person(); p1.show(); Person p2 = new Person("周星驰", 27); p2.show(); } }1分选项： A:null---0周星驰---27 B:null---27周星驰---27 C:周星驰---0null---27 D:周星驰---27null---27

12.以Person作为父类，创建学生子类Student,请完善程序。Class Person{ private String name; private int age; public Person() { System.out.println("调用了Person类的无参构造方法"); } public Person(String name, int age) { System.out.println("调用了Person类的有参构造方法"); this.name=name; this.age=age; } public void show() { System.out.println("姓名:"+name+" 年龄:"+age); }}Class Student （） //指明Person为父类{ private String department; public Student() { System.out.println("调用了学生类的无参构造方法Student()"); } public Student (String name,int age,String dep) { （）; //调用父类的有参构造方法 department=dep; System.out.println("我是"+department +"的学生"); System.out.println("调用了学生类的有参构造方法Student(String name,int age,String dep) "); } public （） //定义show方法，实现对父类show方法的覆盖 { System.out.println("学院:"+department); }}Public class Test{ public static void main(String] args) { Student stu1=new Student(); Student stu2=new Student("张三",23, "计算机科学系"); stu2.show( ); //调用stu2的show方法 }}

13.1、请根据已知的程序代码，补全类Teacher的工资设置方法setSalary的代码，显示教师信息。 public class Test{ public static void main(String[] args) { Teacher zhang=new Teacher("zhang",40,4580,"VP"); Teacher wang=new Teacher("wang"); zhang.display(); wang.display(); wang.setSalary(3800); wang.display(); }} class Teacher{ private String name; private int age; private double salary; private String professionalTitle; public Teacher(String name,int age,double salary,String professionalTitle){ this.name=name; this.age=age; this.salary=salary; this.professionalTitle=professionalTitle; } public Teacher(String name){ this.name=name; this.age=0; this.salary=0; this.professionalTitle=""; } public void setName(String name){ this.name=name; } public String getName(){ return this.name; } public void setAge(int age){ this.age=age; } public int getAge(){ return this.age; } public void setSalary(double salary){ } public double getSalary(){ return salary; } public void setProfessionalTitle(String professionalTitle){ this.professionalTitle=professionalTitle; } public String getProfessionalTitle(){ return this.professionalTitle; }}选项： A:this.salary = salary; B:salary = salary; C:salary = this.salary; D:其他

14.【单选题】在如下所示的JAVA代码中,this指代的是? public class Person{ private String name; public void setName(String name){ this.name=name; } A. Person类 B. Person类所创建对象的引用 C. setName(String name)的参数name D. setName(String name)方法

15.智慧职教: class Person { public string Name{get；set；} public int Age{get；set；}}对person类初始化正确是（）

16.编译运行如下java代码，输出结果是（）class Person{ String name = "person"; public void shout(){ System.out.print(name); }}class Student extends Person{ String name = "student"; String school = "school";} public class Test{ public static void main(String[] args){ Person p = new Student(); p.shout(); }}选项： A: person ; B:student ; C:person student ; D:编译错误

17. 单选题What is the output of the following code? ( )Public class Test {Public static void main(String] args) {New Person().printPerson();New Student().printPerson();}}Class Student extends Person {Private String getInfo() {Return "Student";}}Class Person {Private String getInfo() {Return "Person";}Public void printPerson() {System.out.println(getInfo());}} 选项： A:Person Person B:Person Student C:Stduent Student D:Student Person

18.【填空题】23. import java.text.*; public class Java_2 { public static void main(String[] args) { Person[] people = new Person[2]; people[0] = new Worker("老张", 30000); people[1] = new Student("小王", "计算机科学"); for (int i = 0; i < people.length; i++) { Person p = people[i]; //*********Found********** System.out.println(____________________() + ", " + p.getDescription()); } } } //*********Found********** ________________ class Person { public Person(String n) { name = n; } //*********Found********** public ___________________ String getDescription(); public String getName() { return name; } private String name; } //*********Found********** class Worker _________________ Person { public Worker(String n, double s) { super(n); salary = s; } public String getDescription() { NumberFormat formatter = NumberFormat.getCurrencyInstance(); return "工人，年薪是 " + formatter.format(salary) + "。"; } private double salary; } //*********Found********** class Student _________________ Person { public Student(String n, String m) { super(n); major = m; } public String getDescription() { return "学生，专业是 " + major + "。"; } private String major; }

19. public class Person{ String name; int age; char sex; public void sayHello(){ System.out.println("Hello"); } } 关于以上类的定义说法正确的是（）选项： A、 Person这个类不能运行 B、 Person类中有三个成员变量分别是name,age和sex C、 Person类中有一个成员方法是sayHello() D、 Person类可以创建出多个对象，这些对象都有name，age和sex属性。都能执行sayHello()方法。

20.What is the output of the following code? public class Test { public static void main(String[] args) { new Person().printPerson(); new Student().printPerson(); } } class Student extends Person { public String getInfo() { return "Student"; } } class Person { public String getInfo() { return "Person"; } public void printPerson() { System.out.println(getInfo()); } }选项： A:Person Person; B:Person Student; C:Stduent Student; D:Student Person

21.在下列程序的划线处应填入的语句是 class Person{ private int a; } public class Man extends Person{ public int b; public static void main(String arg[]){ Person p = new Person(); Man t = new Man(); int i =_________; } }

22.What is the output of the following code? ( )Public class Test {Public static void main(String] args) {New Person().printPerson();New Student().printPerson();}}Class Student extends Person {@OverridePublic String getInfo() {Return "Student";}}Class Person {Public String getInfo() {Return "Person";}Public void printPerson() {System.out.println(getInfo());} } 选项： A:Person Person B:Person Student C:Stduent Student D:Student Person

23. 单选题What is the output of the following code? ( )Public class Test {Public static void main(String] args) {New Person().printPerson();New Student().printPerson();}}Class Student extends Person {@OverridePublic String getInfo() {Return "Student";}}Class Person {Public String getInfo() {Return "Person";}Public void printPerson() {System.out.println(getInfo());}} 选项： A:Person Person B:Person Student C:Stduent Student D:Student Person