问答题
[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{{U}} (1) {{/U}};
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{{U}} (2) {{/U}}{
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{{U}} (3) {{/U}}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;
{{U}}(4) {{/U}};
double sala = this. getSalary( );
{{U}} (5) {{/U}};
this. setSalary(sala);
}
}
【正确答案】
【答案解析】(1)salary (2)SalaryRalse (3)Worker (4) super. raise() (5)sala+=bonus及其等效形式
(1)从Worker这个类的结构来看，它有两个属性ufinle和salary，因此这里应该填salary；
(2)～(3)：很显然Programmer类和Manager类继承于 Worker类和SalaryRaise接口。
(4)～(5)：CEO类继承于Manager类，而根据题意， CEO除了有Managor的涨幅，还有1000元的bonus。所以，CEO薪水的涨幅可以使用基类相同的方法super． raise()，然后再加上奖金sala+=bonus即可。