class Manager extends Employee{
public int getSalary(double x){}
}
class Manager extends Employee{
public double getSalary(int x,int y){}
}
class Manager extends Employee{
public double getSalary(){}
}
class Manager extends Employee{
public int getSalary(int x,int y){}
}
第1题:
在下列源代码文件Test.java中,正确定义类的代码是( )。
A.pblic class test { public int x=0; public test(int x) { this. x=x;} }
B.public class Test { public int x=0; public Test(int x) { this. x=x;} }
C.public class Test extends T1,T2{ public int x = 0; public Test(int x){ this. x = x; } }
D.protected class Test extends T2{ public int x = 0; public Test(int x) { this. x = x; } }
第2题:
在下列源代码文件Test.java中, ( )是正确的类定义。
A.public class test{
B.public class Test{ public int x=0;public int x=0; public test (intx) public Test (int x){ {this.x=x; this.x=x;} }} }
C.public class Test extends T1,T2{
D.protected class Test extends T2{ public int=0;public int x=0; public Test(int x){Public Test (int x){ this.x=x;this.x=x: }} }}
第3题:
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) t
this. 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);
}
}
第4题:
interface Data { public void load(); } abstract class Info { public abstract void load(); } Which class correctly uses the Data interface and Info class?()
第5题:
在下列源代码文件Test.java中,哪个选项是正确的类定义?
A.public class test{ public int x=0; public test(int x ) { this.x=x; } }
B.public class Test { public int x=0; public Test(int x ) { this.x=x; } }
C.public class Test extends T1 T2 { public int x=0; public Test(int x){ this.x=x; } }
D.protected class Test extends T2 { public int x=0; public Test(int x) { this.x=x; } }
第6题:
已知:Manager extends Employee观察:public Manager(String n,double s,int year,int month,int day) { super(n,s,year,month,day); bonus=0; }其中super是 ( )
A.Object类
B.Manager类
C.Employee类
D.Class类
第7题:
A.Employee e=new Manager();
B.Director d=new Manager();
C.Director d=new Employee();
D.Manager m=new Director();
第8题:
阅读和理解下面程序段: class Manager extends Employee{ public Manager(String n,double s,int year,int month,int day){ super(n,s,year,month,day); bonus=0; } public double getSalary(){ double baseSalary-super.gerSalary(); return baseSalary+bonus; } public void setBonus(double b){bonus=b; ) private double bonus; } Manager是Employee的子类,其理由是( )。
A.Manager的适用范围较宽
B.extends关键字声明
C.Manager的域减小了
D.雇员是一个经理
第9题:
Which three demonstrate an “is a” relationship?()
第10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?()