单选题1. public class Employee {  2. String name;  3. double baseSalary;  4. Employee(String name, double baseSalary) {  5. this.name = name;  6. this.baseSalary = baseSalary;  7. }  8. }  And:  1. public class Salesperson extends Employee { 2. double commission;  3. public Salesperson(String name, double baseSalary,  4. double commission) {  5. // insert code here  6. } 7. }  Which code, inserted at line 7, completes the Salesperson constructor?()A this.commission = commission;B superb(); commission = commission;C this.commission = commission; superb();D super(name, baseSalary); this.commission = commission;E super(); this.commission = commission;F this.commission = commission; super(name, baseSalary);

单选题
1. public class Employee {  2. String name;  3. double baseSalary;  4. Employee(String name, double baseSalary) {  5. this.name = name;  6. this.baseSalary = baseSalary;  7. }  8. }  And:  1. public class Salesperson extends Employee { 2. double commission;  3. public Salesperson(String name, double baseSalary,  4. double commission) {  5. // insert code here  6. } 7. }  Which code, inserted at line 7, completes the Salesperson constructor?()
A

 this.commission = commission;

B

 superb(); commission = commission;

C

 this.commission = commission; superb();

D

 super(name, baseSalary); this.commission = commission;

E

 super(); this.commission = commission;

F

 this.commission = commission; super(name, baseSalary);


参考解析

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阅读以下说明和Java代码,将应填入(n)处的字句写在对应栏内。[说明]本程序的功能是给公司的员工Tom,Jack,Green增加薪水。三人的职位分别是programmer, Manager,CEO。程序由6个类组成:WorkerTest是主类,programmer,Manager,CEO三个类,薪水增加的规则是 programmer的涨幅是5%;Manager的是10%;CEO也是Manager,但是它除了有Manager的涨幅,还有1000元的bonus。接口SalaryRaise提供了一个增加薪水的方法raise()。[java程序]public class WorkerTest {public WorkerTest( ) {}public static void main( String[] args) {Programmer programmer = new Programmer( "Tom" ,3000);Manager manager = new Manager( "Jack" ,4000);CEO ceo = new CEO( "Green" ,4000);Worker [] worker = new Worker[3];programmer, raise( );manager, raise( );ceo. raise( );worker[0] = programmer;worker [1] = manager;worker[2] = ceo;for ( int i = 0 ;i < worker, length; i + + ) {System. out. prinfln (" Name:" + worker [i]. getName ( ) +" \ tSalary:" + worker [i]. getSalary ());public interface SalaryRaise { void raise( ); }public class Worker {public String name;public double (1);public Worker( ) {}public String getName( ) {return name;}public void setName( String name) {this. name = name;}public double getSalary( ) {return salary;}public void setSalary(double salary) { this. salary = salary; }}public class Programmer extends Worker implements (2) {public Programmer( ) {}public void raise( ) {double pets=0.05;double sala = this. getSalary( ) * (1 + pers);this. setSalary (sala);public Programmer( Siring name, double salary) tthis. name = name;this. salary = salary;public class Manager extends (3) implements SalaryRaise {public Manager( ) { }public Manager(String name, double salary) {this. name = name;this. salary = salary;}public void raise( ) {double pets = 0.1;double sala = this. getSalary() * (1 + pers);this. setSalary(sala);}}public class CEO extends Manager implements SalaryRaise {public CEO() {}public CEO( String name,double salary) {this. name = name;this. salary = salary;}public void raise( ) {double bonus = 1000;(4);double sala = this. getSalary( );(5);this. setSalary(sala);}}

试题六(共15分)阅读以下说明和Java代码,填补Java代码中的空缺(1)~(6),将解答写在答题纸的对应栏内。【说明】己知某公司按周给员工发放工资,其工资系统需记录每名员工的员工号、姓名、工资等信息。其中一些员工是正式的,按年薪分周发放(每年按52周计算);另一些员工是计时工,以小时工资为基准,按每周工作小时数核算发放。下面是实现该工资系统的Java代码,其中定义了四个类:工资系统类PayRoll,员工类Employee,正式工类Salaried和计时工类Hourly,Salaried和Hourly是Employee的子类。【Java代码】abstract class Employee{protected String name; //员工姓名protected int empCode; //员工号protected double salary; //周发放工资public Employee(int empCode, String name){this.empCode= empCode;this.name= name;}public double getSalary(){return this.salary;}public abstract void pay();}class Salaried (1) Employee{private double annualSalary;Salaried(int empCode, String name, double payRate){super(empCode, name);this.annualSalary= payRate;}public void pay(){salary= (2) ;//计算正式员工的周发放工资数System.out.println(this.name+":"+this.salary);}}class Hourly (3) Employee{private double hourlyPayRate;private int hours;Hourly(int empCode, String name, int hours, double payRate){super(empCode, name);this.hourlyPayRate= payRate;this.hows= hours,}public void pay(){salary= (4) ;//计算计时工的周发放工资数System.out.println(this.name+":"+this.salary);}}public class PayRoll{private (5) employees[]={new Salaried(l001,"Zhang San", 58000.00),//此处省略对其他职工对象的生成new Hourly(1005,"Li", 12, 50.00)};public void pay(Employee e[]){for (int i=0;ie.length; i++){e[i].pay();}}public static void main(String[] args){PayRoll payRoll= new PayRoll();payRoll.pay( (6) );double total= 0.0;for (int i=0;ipayRoll.employees.length; i++){//统计周发放工资总额total+=payRoll.employees[i].getSalary();}System.out.println(total);}}

类Account中字段声明正确的是?()    A、class Account{  name;  amount;  }B、class Account{  String name;  double amount;  }C、class Account{  String name=1.0;  double amount=”Mike”;  }D、class Account{  String name=”Mike”,double amount=1000.0;  }

1. public interface A {  2. public void doSomething(String thing);  3. }  1. public class AImpl implements A {  2. public void doSomething(String msg) { }  3. }  1. public class B {  2. public A doit() {  3. // more code here  4. }  5.  6. public String execute() { 7. // more code here  8. }  9. }  1. public class C extends B {  2. public AImpl doit() {  3. // more code here  4. }  5.  6. public Object execute() {  7. // more code here  8. }  9. }  Which statement is true about the classes and interfaces in the exhibit?() A、 Compilation will succeed for all classes and interfaces.B、 Compilation of class C will fail because of an error in line 2.C、 Compilation of class C will fail because of an error in line 6.D、 Compilation of class AImpl will fail because of an error in line 2.

Class TestException  1. public class TestException extends Exception {  2. } Class a:  1. public class a {  2.  3. public String sayHello(String name) throws TestException {  4.  5. if(name == null) {  6. throw new TestException();  7. }  8.  9. return “Hello “+ name;  10. }  11.  12. }  A programmer wants to use this code in an application: 45. A a=new A();  46. System.out.println(a.sayHello(”John”));  Which two are true?()A、 Class a will not compile.B、 Line 46 can throw the unchecked exception TestException.C、 Line 45 can throw the unchecked exception TestException.D、 Line 46 will compile if the enclosing method throws a TestException.E、 Line 46 will compile if enclosed in a try block, where TestException is caught.

1. public class A {  2. public void doit() {  3. }  4. public String doit() {  5. return “a”;  6. }  7. public double doit(int x) {  8. return 1.0;  9. }  10.}  What is the result?() A、 An exception is thrown at runtime.B、 Compilation fails because of an error in line 7.C、 Compilation fails because of an error in line 4.D、 Compilation succeeds and no runtime errors with class A occur.

public class Employee{       private String name;  public Employee(String name){           this.name = name;      }  public String getName(){         return name;      } }  public class Manager extends Employee{       public Manager(String name){          System.out.println(getName());      } }  执行语句new Manager(“smith”)后程序的输出是哪项?() A、 smithB、 nullC、 编译错误D、 name

public class Employee{   private String name;   public Employee(String name){   this.name = name;  }   public void display(){   System.out.print(name);  }  }   public class Manager extends Employee{   private String department;   public Manager(String name,String department){   super(name);   this.department = department;  }   public void display(){   System.out.println( super.display()+”,”+department);  }   }   执行语句new Manager(“smith”,”SALES”)后程序的输出是哪项?() A、 smith,SALESB、 null,SALESC、 smith,nullD、 null,null

1. public class returnIt (  2. returnType methodA(byte x, double y) (  3. return (short) x/y * 2;  4. )  5. )   What is the valid returnType for methodA in line 2?()  A、 IntB、 ByteC、 LongD、 ShortE、 FloatF、 Double

我们定义一个Account类来描述银行账户,银行账户有账户名、金额等属性特征,同时有存款、取款等行为特征,下述代码适合描述的是哪项?()     A、class  Accountf      String name;//账户     S tring amount;  //金额      Account (String name)(    ) void deposit (double mount){  //存款     ) void withdraw (double mount){  //取款     }     )B、class  Accountf      String name;//账户d ouole amount;  //金额      Account(double amount){   } void deposit (double mount){  //存款     ) void withdraw (double mount){  //取款     )     )C、class  Accountf      String name;//账户 double amount;  //金额      Account (String name){} void deposit (double mount){//存款     )  void withdraw (double mount){  //取款     )     )D、class Accountf      String name;//账户      double amount;//金额      Account (String name){}      void deposit(){//存款     )  void withdraw(){//取款 )     )

public class Plant {  private String name;  public Plant(String name) { this.name = name; }  public String getName() { return name; }  }  public class Tree extends Plant {  public void growFruit() { }  public void dropLeaves() { }  }  Which is true?() A、 The code will compile without changes.B、 The code will compile if public Tree() { Plant(); } is added to the Tree class.C、 The code will compile if public Plant() { Tree(); } is added to the Plant class.D、 The code will compile if public Plant() { this(”fern”); } is added to the Plant class.E、 The code will compile if public Plant() { Plant(”fern”); } is added to the Plant class.

1. public class OuterClass {  2. private double d1 = 1.0;  3. // insert code here  4. }  Which two are valid if inserted at line 3?()  A、 static class InnerOne { public double methoda() { return d1; } }B、 static class InnerOne { static double methoda() { return d1; } }C、 private class InnerOne { public double methoda() { return d1; } }D、 protected class InnerOne { static double methoda() { return d1; } }E、 public abstract class InnerOne { public abstract double methoda(); }

1. class super {  2. public float getNum() {return 3.0f;}  3. }  4.    5. public class Sub extends Super { 6.   7. }   Which method, placed at line 6, will cause a compiler error?()  A、  Public float getNum()   {return 4.0f; }B、  Public void getNum ()  { }C、  Public void getNum (double d)   { }D、  Public double getNum (float d) {retrun 4.0f; }

11. class Person {  12. String name = “No name‟;  13. public Person(String nm) { name = nm; }  14. }  15.  16. class Employee extends Person {  17. String emplD = “0000”;  18. public Employee(String id) { empID = id; }  19. }  20.  21. public class EmployeeTest {  22. public static void main(String[] args) {  23. Employee e = new Employee(”4321”);  24. System.out.println(e.empID);  25. }  26. }  What is the result?() A、 4321B、 0000C、 An exception is thrown at runtime.D、 Compilation fails because of an error in line 18.

单选题public class Employee{       private String name;  public Employee(String name){           this.name = name;      }  public void display(){         System.out.print(name);      } }  public class Manager extends Employee{       private String department;  public Manager(String name,String department){          super(name);  this.department = department;  }  public void display(){  System.out.println(super.display()+”,”+department);      } }  执行语句new Manager(“smith”,”SALES”)后程序的输出是哪项?()A smith,SALESB null,SALESC smith,nullD null,nullE 编译错误

多选题Class TestException  1. public class TestException extends Exception {  2. } Class a:  1. public class a {  2.  3. public String sayHello(String name) throws TestException {  4.  5. if(name == null) {  6. throw new TestException();  7. }  8.  9. return “Hello “+ name;  10. }  11.  12. }  A programmer wants to use this code in an application: 45. A a=new A();  46. System.out.println(a.sayHello(”John”));  Which two are true?()AClass a will not compile.BLine 46 can throw the unchecked exception TestException.CLine 45 can throw the unchecked exception TestException.DLine 46 will compile if the enclosing method throws a TestException.ELine 46 will compile if enclosed in a try block, where TestException is caught.

单选题public class Employee{       private String name;  public Employee(String name){           this.name = name;      }  public String getName(){         return name;      } }  public class Manager extends Employee{       private String department;  public Manager(String name,String department){          this.department = department;          super(name);  System.out.println(getName());      }  }  执行语句new Manager(“smith”,”SALES”)后程序的输出是哪项?()A smithB nullC SALESD 编译错误

单选题1. public class A {  2. public void doit() {  3. }  4. public String doit() {  5. return “a”;  6. }  7. public double doit(int x) {  8. return 1.0;  9. }  10.}  What is the result?()A An exception is thrown at runtime.B Compilation fails because of an error in line 7.C Compilation fails because of an error in line 4.D Compilation succeeds and no runtime errors with class A occur.

多选题1. class BigDog extends Dog {  2. // insert code here  3. }  分别插入到第 2 行,哪二项可以编译?()ABigDog() { super(); this(); }BBigDog() {  String name = Fido;  super();  }CBigDog() {  super();  String name = Fido;  }Dprivate BigDog() {  super();}

单选题1. public class Person {  2. private String name;  3. public Person(String name) { this.name = name; }  4. public boolean equals(Person p) {  5. return p.name.equals(this.name);  6. }  7. }  Which is true?()A The equals method does NOT properly override the Object.equals method.B Compilation fails because the private attribute p.name cannot be accessed in line 5.C To work correctly with hash-based data structures, this class must also implement the hashCode method.D When adding Person objects to a java.util.Set collection, the equals method in line 4 will prevent duplicates.

单选题public class Employee{   private String name;   public Employee(String name){   this.name = name;  }   public String getName(){   return name;  }  }   public class Manager extends Employee{   public Manager(String name){   System.out.println(getName());  }  }   执行语句new Manager(“smith”)后程序的输出是哪项?()A smithB nullC 编译错误D name

单选题1. class super {  2. public float getNum() {return 3.0f;}  3. }  4.    5. public class Sub extends Super { 6.   7. }   Which method, placed at line 6, will cause a compiler error?()A  Public float getNum()   {return 4.0f; }B  Public void getNum ()  { }C  Public void getNum (double d)   { }D  Public double getNum (float d) {retrun 4.0f; }

单选题下列选项中,能实现对父类的getSalary方法重写的是(  )。class Employee{public double getSalary(){}}Aclass Manager extends Employee{public int getSalary(double x){}}Bclass Manager extends Employee{public double getSalary(int x,int y){}}Cclass Manager extends Employee{public double getSalary(){}}Dclass Manager extends Employee{public int getSalary(int x,int y){}}

单选题public class Plant {  private String name;  public Plant(String name) { this.name = name; }  public String getName() { return name; }  }  public class Tree extends Plant {  public void growFruit() { }  public void dropLeaves() { }  }  Which is true?()A The code will compile without changes.B The code will compile if public Tree() { Plant(); } is added to the Tree class.C The code will compile if public Plant() { Tree(); } is added to the Plant class.D The code will compile if public Plant() { this(”fern”); } is added to the Plant class.E The code will compile if public Plant() { Plant(”fern”); } is added to the Plant class.

多选题1. public class OuterClass {  2. private double d1 = 1.0;  3. // insert code here  4. }  Which two are valid if inserted at line 3?()Astatic class InnerOne { public double methoda() { return d1; } }Bstatic class InnerOne { static double methoda() { return d1; } }Cprivate class InnerOne { public double methoda() { return d1; } }Dprotected class InnerOne { static double methoda() { return d1; } }Epublic abstract class InnerOne { public abstract double methoda(); }

单选题1. public class Employee {  2. String name;  3. double baseSalary;  4. Employee(String name, double baseSalary) {  5. this.name = name;  6. this.baseSalary = baseSalary;  7. }  8. }  And:  1. public class Salesperson extends Employee { 2. double commission;  3. public Salesperson(String name, double baseSalary,  4. double commission) {  5. // insert code here  6. } 7. }  Which code, inserted at line 7, completes the Salesperson constructor?()A this.commission = commission;B superb(); commission = commission;C this.commission = commission; superb();D super(name, baseSalary); this.commission = commission;E super(); this.commission = commission;F this.commission = commission; super(name, baseSalary);

单选题public class Employee{   private String name;   public Employee(String name){   this.name = name;  }   public void display(){   System.out.print(name);  }  }   public class Manager extends Employee{   private String department;   public Manager(String name,String department){   super(name);   this.department = department;  }   public void display(){   System.out.println( super.display()+”,”+department);  }   }   执行语句new Manager(“smith”,”SALES”)后程序的输出是哪项?()A smith,SALESB null,SALESC smith,nullD null,null

单选题public class Employee{   private String name;   public Employee(String name){   this.name = name;  }   public String getName(){   return name;  }  }   public class Manager extends Employee{   private String department;   public Manager(String name,String department){   this.department = department;   super(name); (应于上一行掉位置)   System.out.println(getName());  }  }   Super的位置是否在方法的首行   执行语句new Manager(“smith”,”SALES”)后程序的输出是哪项?()A smithB nullC SALESD 编译错误