被顺序调用?请选择输出结果 ( )class People { String name; public Pe

1.被顺序调用, 请选择输出结果 ( )class People { String name; public People() { System.out.print(1); } public People(String name) { System.out.print(2); this.name = name; } } class Child extends People { People father; public Child(String name) { System.out.print(3); this.name = name; father = new People(name + ":F"); } public Child(){ System.out.print(4); } }public class Test{ public static void main(String[] args){ People p = new Child("梅西"); }} 选项：312|32|432|132

2.以下代码被顺序调用？请选择输出结果 ( )class People { String name; public People() { System.out.print(1); } public People(String name) { System.out.print(2); this.name = name; } } class Child extends People { People father; public Child(String name) { System.out.print(3); this.name = name; father = new People(name + ":F"); } public Child(){ System.out.print(4); } }public class Test{ public static void main(String[] args){ People p = new Child("梅西"); }}选项： A:312; B:32; C:432; D:132

3.public class Child extends People { People father; public Child(String name) { System.out.print(3); this.name = name; father = new People(name + ":F"); } public Child() { System.out.print(4); } public static void main(String[] args) { new Child("Alice"); } } class People { String name; public People() { System.out.print(1); } public People(String name) { System.out.print(2); this.name = name; }}选项： A:32; B:132; C:123; D:1234

4.下面是People和Child类的定义和构造方法,每个构造方法都输出编号。在执行new Child("mike")的时候都有哪些构造方法被顺序调用?请选择输出结果 ( )Class People { String name; public People() { System.out.print(1); } public People(String name) { System.out.print(2); this.name = name; }}Class Child extends People { People father; public Child(String name) { System.out.print(3); this.name = name; father = new People(name + ":F"); } public Child(){ System.out.print(4); }}(2分) 选项： A:312 B:32 C:432 D:132

5. 下面是People和Child类的定义和构造方法,每个构造方法都输出编号。在执行new Child("mike")的时候都有哪些构造方法被顺序调用?请选择输出结果 ( )Class People { String name; public People() { System.out.print(1); } public People(String name) { System.out.print(2); this.name = name; }}Class Child extends People { People father; public Child(String name) { System.out.print(3); this.name = name; father = new People(name + ":F"); } public Child(){ System.out.print(4); }} 选项： A:312 B: 32 C: 432 D: 132

6.已知People类定义如下： public class People{ String name; int age; char sex; People(String n,int a,char s) { name=n; age=a; sex=s; } } MainClass类定义如下： public class MainClass{ public static void main(String args[]) { People p1=new People("lily",20,'女'); People p2=p1; People p3=new People("lily",20,'女'); System.out.print((p1==p2)+","+(p1==p3)); } } 程序的输出结果是________________________________.

7. 已知People类定义如下： public class People{ String name; int age; char sex; People(String n,int a,char s) { name=n; age=a; sex=s; } } MainClass类定义如下： public class MainClass{ public static void main(String args[]) { People p1=new People("lily",20,'女'); People p2=p1; People p3=new People("lily",20,'女'); System.out.print((p1==p2)+","+(p1==p3)); } }程序的输出结果是________________________________.

8.以下程序的输出结果是？class Person{String name="person";public void shout(){System.out.print(name);}}class Student extends Person{String name="student";String school="school";}class Test{public static void main(String[] args){Person p=new Student();System.out.print(p instanceof Student);System.out.print(p instanceof Person);System.out.print(p instanceof Object);System.out.print(p instanceof System);}}

9.智慧职教: 分析下面的Java代码，编译运行结果是()public class Test{ String name; public Test(){ this.name="小新"; } public Test(String name){ System.out.println("我是"+this.name); } public static void main(String[] args){ Test test=new Test("小强")； }}

10.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

11.public class InheritThread extends Thread { private String name; public InheritThread (String name) { this.name = name; } public void run() { System.out.println("Greetings from thread name !"); } } public static void main(String args[]) { InheritThre

12.class Student{ private String name; public Student(String name) { this.name=name; } public void setName(String name) { this.name=name; } public String getName() { return name; }}public class test4 { public static void modifyStudent(Student std) { std.setName("张三"); } public static void main(String[] args) { Student s1=new Student("李四"); System.out.println(s1.getName()); modifyStudent(s1); System.out.println(s1.getName()); }}

13.47．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

14.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

15.编译运行如下 Java代码，输出结果是。class Base {public void method(){System.out.print ("Base method");}}class Child extends Base{public void methodB(){System.out.print ("Child methodB");}}class Sample {public static void main(String[] args) {Base base= new Child();base.methodB();}}

16.编译运行如下JAVA代码,输入结果是().Class Base {public void method(){System.out.print(“Base method”);}}Class Child extends Base {public void method(){System.out.print(“Child method”);}}Class Sample {public static void main (String[]args){Base base =new Child()Base.method();}}

17.【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; }

18.public class InheritThread extends Thread {private String name;public InheritThread (String name) {this.name = name;}public void run() {System.out.println("Greetings from thread name !");}}public static void main(String args[]){InheritThread greetings = new InheritThread ("Inherited");greetings.start();System.out.println(" Main Thread has been ended");}以上代码执行的结果可能是：

19.下列Java代码中Test类中的四个输出语句的输出结果依次是(　　) Class Person{ String name=”person”; public void shout(){ System.out.println(name); } } class Student extends Person{ String name=”student”; String school=”school”; } Class Test{ public static void main (String[] args ){ Person p=new Student(); System.out.print(p instanceof Student); System.out.print(p instanceof Person); System.out.print(p instanceof Object); System.out.print(p instanceof System); } } 选项：A、true,false,true,falseB、false,true,false,falseC、true,true,true,D、true,,true,false,编译错误

20.[单选题]给出下面代码： 1: class Parent { 2: private String name; 3: public Parent(){} 4: } 5: public class Child extends Parent { 6:private String department; 7:public Child() {} 8: public String getValue(){ return name; } 9: public static void main(String arg[]) { 10: Parent p = new Parent(); 11: } 12: } 那些行将引起错误？ ( ) A 第3行 B 第6行 C 第7行 D 第8行

21. 编译运行如下Java代码,输出结果是( )class Base {public void method(){System.out.print ("Base method");}}class Child extends Base{public void methodB(){System.out.print ("Child methodB");}}class Sample {public static void main(String[] args) {Base base= new Child();base.methodB();}} 选项： A、 Base method B、 Child methodB C、 Base method Child MethodB D、编译错误

22.1、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

23.【单选题】下列Java代码中Test类中的4个输出语句的输出结果依次是( )。class Person{String name = "person";public void shout(){System.out.println(name);}}class Student extends Person{String name="student";String school="school";}class Test{public static void main(String[] args){Person p=new Student();System.out.print(p instanceof Student);System.out.print(p instanceof Person);System.out.print(p instanceof Object);System.out.print(p instanceof System);}}(2.0)(2.0) 选项：A、true、false、true、falseB、false、true、false、falseC、true、true、true、编译错误D、true、true、false、编译错误

24.public class Employee{ private string name; private int age; public void Say(){ Console.Write("{0} {1}",name,age); } public Employee (string p1,int p2){ name = p1; age = p2; }}以下程序中，能正确运行的是：选项： A:public class Manager{ static void Main(string[] args){ Employee emp = new Employee ("David",9); emp.Say(); }}; B:public class Manager{ static void Main(string[] args){ Employee emp = new Employee (Mary,5); emp.Say(); }}; C:public class Manager{ static void Main(string[] args){ Employee emp = new Employee (7, "David"); emp.Say(); }}; D:public class Manager{ static void Main(string[] args){ Employee emp = new Employee (); emp.Say(); }}