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 na

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]

在一些大型系统中，大多数的功能在初始化时要花费很多时间，如果在启动的时候，所有功能(连不用的功能)都要全面初始化的话，会连带影响到应用软件要花很多时间才能启动。因此常将程序设计成到了实际要使用某种功能的阶段才初始化该功能。

以下示例展示了Proxy(代理)模式，PrinterProxy类执行一些比较“轻”的方法——设置名称和取得名称，需要真正执行“重”的方法——真正打印——时才初始Print类。图6-1显示了各个类间的关系。

[图6-1]

[Java代码]

//Printable.Java

publiC (1) Printable{

public abstract void setPrinterName(String name)；

public abstract String getprinterName()；

public abstract void print(String string)；

}

//Printer.Java

public class Printer implements Printable{

private String name；

public Printer(){

System.out.println("正在产生Printer的对象实例")；

}

public Printer(String name){

this.name=name；

heavyJob("正在产生Printer的对象实例("+name+")")；

public void setPrinterName(String name){

this.name=name；

public String getPrinterName(){

return name；

public void print(String string){

System.out.println("===" +name+" ====")；

System.out.println(string)；

}

}

//PrinterProxy.Java

public class PrinterProxy (2) Printable{

private String name；

private Printer real；

public PrinterProxy(){}

public PrinterProxy(String name){

this.name=name；

}

public gynchronized void setPrinterName(String name){

if( (3) ){

real.setPrinterName(name)；

}

this.name=name；

}

public String getprinterName(){

return name；

}

public void print(String string){

(4)；

real.print(string)；

}

private synchronized void realize(){//产生真正的Printer对象

if(real==null){

real=(5)；

}

}

}

(1)

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);

}

}

interface Playable {

void play();

}

interface Bounceable {

void play();

}

interface Rollable extends Playable, Bounceable {

Ball ball = new Ball("PingPang");

}

class Ball implements Rollable {

private String name;

public String getName() {

return name;

}

public Ball(String name) {

this.name = name;

}

public void play() {

ball = new Ball("Football");

System.out.println(ball.getName());

}

}

这个错误不容易发现。