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明泽颜书

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18279064522

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18279064522

package P107;

interface On_Off {
int ON = 1;
int OFF = 0;

void on();

void off();
}

class Lamp implements On_Off {
int on = On_Off.OFF;

public void on() {

  if (on == On_Off.OFF) {
   System.out.println("开灯!");
   on = On_Off.ON;
  } else
   System.out.println("灯已经开了");
}

public void off() {
  if (on == On_Off.ON) {
   System.out.println("关灯");
   on = On_Off.OFF;
  } else
   System.out.println("灯已经关了");
}
}

class Computer implements On_Off {
String logo;
int on = On_Off.OFF;

Computer() {
}

Computer(String logo) {
  this.logo = logo;
}

public String getLogo() {
  return logo;
}

public void setLogo(String logo) {
  this.logo = logo;
}

public void on() {

  if (on == On_Off.OFF) {
   System.out.println("计算机正在开机 开机成功");
   on = On_Off.ON;
  } else
   System.out.println("计算机已开机");
}

public void off() {
  if (on == On_Off.ON) {
   System.out.println("计算机正在关机 关机成功");
   on = On_Off.OFF;
  } else
   System.out.println("计算机已关机");
}
}

class Person {
String name;

public Person(String s) {
  name = s;
  System.out.println("创建一个操作者:" + s);
}

public void doOn(On_Off o) {
  System.out.println(name + "正在进行开操作:");
  o.on();
}

public void doOff(On_Off o) {
  System.out.println(name + "正在进行关操作:");
  o.off();
}
}

public class p {
public static void main(String[] args) {
  Person zhangsan = new Person("张三");
  Computer computer = new Computer("lenovo");
  Lamp lamp = new Lamp();
  zhangsan.doOn(lamp);
  zhangsan.doOn(computer);
  zhangsan.doOn(computer);
  zhangsan.doOff(computer);
  zhangsan.doOff(lamp);
}
}

18279064522

package Shuzhu;
interface Cubage{
  public static final double PI=3.14;
  public double doCubage();
  public void showMessage(String s);
}
class Cylinder implements Cubage{
   double r;
   double h;
  public Cylinder (double r,double h){
   this.r=r;
   this.h=h;  
  }
  public void showMessage(String s){
   System.out.println("这是"+s);
  }
  public double doCubage(){
   return (Cubage.PI*r*r*h);
  }
}
class Cone implements Cubage{
  double r;
  double h;
public Cone(double r,double h){
  this.r=r;
  this.h=h;  
}
public void showMessage(String s){
  System.out.println("这是"+s);
}
public double doCubage(){
  return (Cubage.PI*r*r*h/3);
}
}
public class Shuzhu23 {

public static void main(String[] args) {
  Cylinder cylinder=new Cylinder(2.5,4);
  Cone cone=new Cone(3,4);
  System.out.println("圆柱的体积:"+cylinder.doCubage());
  System.out.println("圆锥的体积:"+cone.doCubage());
}

}

18279064522

CREATE TABLE Reader
(
TRID char(10) not NULL PRIMARY KEY,
Rname char(8) NULL,
TypeID int NULL,
Lendnum int NULL,
Foreign key(TypeID) references ReaderType(TypeID)
on delete no action
)

18279064522

USE Library
GO
CREATE TABLE Borrow
(
RID char(10) not NUll
Foreign key references reader(RID) on delete cascade,
BID char(9) not null
Foreign key references Book(BID) on delete no action,
LendDate datetime2(0)not null default(getdate()),
ReturnDate datetime2(0)null,
Primary Key (RID,BID,LendDate)
)

18279064522

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18279064522

USE Library
GO
CREATE TABLE Book
(
BID char(9) not NUll PRIMARY KEY ,
Bname varchar(42) NULL,
Author varchar(20) NUll,
PubComp varchar(28) NUll,
Pubdate datetime Null,
Price decimal(7,2) Null check (Price>0),
Class char(10) NULL
)

18279064522

USE Library
GO
CREATE TABLE ReaderType
(
TypeID int not NUll PRIMARY KEY IDENTITY(1,1),
Typename char(8) NULL,
LimitNum int NUll,
LimitDays int NUll
)

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