Java OBJECT-ORIENTED8/5

Package chapter1.class;
/**
* Make a simple address book.
* @author LENOVO
*
*/
public class Classdemo_01 {
String name;//Name
String phonenum;//Contact Number
String Email;//e-mail
String address;//Home Address
Use the constructor of the class to assign a value to its member variable
Public classdemo_01 (String name,string phonenum,string email,string address) {
This.name=name;
This.phonenum=phonenum;
This.email=email;
this.address=address;
}
/**
* A method for querying information is required.
*/
public void Printmessage () {
System.out.println ("Name:" +name);
SYSTEM.OUT.PRINTLN ("Contact number:" +phonenum);
System.out.println ("e-mail:" +email);
System.out.println ("Home Address:" +address);
}
public static void Main (String[]args) {
/**
* Create an instantiated object of the class with the New keyword and assign it a value ...
*/
classdemo_01 cd=new classdemo_01 ("Xiaohong Zhang", "13343235564", "[email protected]", "Beijing Changping District Shahe Town No. 123th");
Cd.printmessage ();
}

}

Package chapter1.class;
/**
* Simple Length unit conversion
* @author LENOVO
*
*/
Import Java.util.Scanner;

public class Length {

Double num;//numeric value
String units;//Unit
String targetunits;//Target Unit
Double result;//The result of the final conversion
String str= "";
Assigning values to member variables using construction methods
Public Length (double num,string units,string targetunits) {
This.num=num;
This.units=units;
This.targetunits=targetunits;

}
/**
* Method of conversion between units
*/
Public String unitconversion () {
inches------> centimeters
if (Units.equals ("inch") &&targetunits.equals ("cm")) {
result=num*2.54;
str=num+ "inch =" +result+ "cm";
}
CM------> inches
else if (units.equals ("cm") &&targetunits.equals ("inch")) {
result=num* (1/2.54);
str=num+ "cm =" +result+ "inch";
}
Rice------> cm
else if (units.equals ("M") &&targetunits.equals ("cm")) {
result=num*100;
str=num+ "m =" +result+ "cm";
}
CM------> m
else if (units.equals ("cm") &&targetunits.equals ("M")) {
result=num* (1.0/100);
str=num+ "cm =" +result+ "M";
}
inches----> Feet
else if (units.equals ("inch") &&targetunits.equals ("feet")) {
result=num* (1/12.0);
str=num+ "inch =" +result+ "foot";
}
Feet-----> inches
else if (units.equals ("Foot") &&targetunits.equals ("inch")) {
result=num*12;
str=num+ "foot =" +result+ "inch";
}
Feet-----> M
else if (units.equals ("Feet") &&targetunits.equals ("M")) {
result=num* (1/3.2809);
str=num+ "foot =" +result+ "M";
}
M-----> Feet
else if (units.equals ("M") &&targetunits.equals ("feet")) {
result=num*3.2809;
str=num+ "m =" +result+ "feet";
}
return str;
}
/**
* Main method
*/
public static void Main (String[]args) {
System.out.println ("the conversion between length units is as follows:");
System.out.println ("\ n");
Scanner scanner=new Scanner (system.in);
System.out.println ("Please enter a number:");
Double num1=scanner.nextdouble ();
System.out.println ("Please enter the original unit:");
String Str1=scanner.next ();
System.out.println ("Please enter the unit to be converted into:");
String Str2=scanner.next ();
Length cd=new length (NUM1,STR1,STR2);
System.out.println (Cd.unitconversion ());
}



}

Package chapter1.class;

Public class Truckdivers {
 string name;//defines the name of the truck driver
 //truckdivers construction method
 public Truckdivers (String name) {
  this.name=name;
 }
 //the speed of the truck by means of truck-based classes.
 public void Drive (int num) {
  truck tr=new Truck ();
  system.out.print (name);
  tr.speed (num);
 }
 public static void Main (String[]args) {
  truckdivers td=new truckdivers ("Zhang San");
  truckdivers td1=new truckdivers ("John Doe");
  td.drive (80);
  system.out.println ("\ n");
  td1.drive (38);
 }

}
Class truck{
public int wheelnum;//Wheel number of car
public int weight;//weight of car
public int drivespeed;//Driving speed
public void speed (int speed) {
if (speed>=60) {
System.out.println ("Speeding, easy to cause traffic accidents!") ");
drivespeed=40;//if the speed is too fast, it automatically travels at a speed of 40 yards.
System.out.println ("Your current speed is" +drivespeed);
}
else{
System.out.println ("Driving in safe travel speed!") ");
Drivespeed=speed;
System.out.println ("Your current speed is" +drivespeed);
}
}
}

Java OBJECT-ORIENTED8/5