我设法编译了我的代码：
/**
* to write a simple java class Mobile that models a mobile phone.
*
* @author (jamal)
* @version (20/10/13)
*/
public class Mobile
{
// type of phone
private String phonetype;
// size of screen in inches
private int screensize;
// menory card capacity
private int memorycardcapacity;
// name of present service provider
private String serviceprovider;
// type of contract with service provider
private int typeofcontract;
// camera resolution in megapixels
private int cameraresolution;
// the percentage of charge left on the phone
private int checkcharge;
// wether the phone has GPS or not
private String GPS;
// instance variables - replace the example below with your own
private int x;
// The constructor method
public Mobile(String mobilephonetype, int mobilescreensize,
int mobilememorycardcapacity,int mobilecameraresolution,String mobileGPS, String newserviceprovider) {
this.phonetype = mobilephonetype;
this.screensize = mobilescreensize;
this.memorycardcapacity = mobilememorycardcapacity;
this.cameraresolution = mobilecameraresolution;
this.GPS = mobileGPS;
// you do not use this ones during instantiation,you can remove them if you do not need or assign them some default values
//this.serviceprovider = newserviceprovider;
//this.typeofcontract = 12;
//this.checkcharge = checkcharge;
Mobile samsungPhone = new Mobile(
"Samsung" // String mobilephonetype
, 1024 // int mobilescreensize
, 2 // int mobilememorycardcapacity
, 8 // int mobilecameraresolution
, "GPS" //String mobileGPS
, "verizon" // String newserviceprovider
);
//typeofcontract = 12;
//checkcharge = checkcharge;
}
// A method to display the state of the object to the screen
public void displayMobileDetails() {
System.out.println("phonetype: " + phonetype);
System.out.println("screensize: " + screensize);
System.out.println("memorycardcapacity: " + memorycardcapacity);
System.out.println("cameraresolution: " + cameraresolution);
System.out.println("GPS: " + GPS);
System.out.println("serviceprovider: " + serviceprovider);
System.out.println("typeofcontract: " + typeofcontract);
}
/**
* The mymobile class implements an application that
* simply displays "new Mobile!" to the standard output.
*/
public class mymobile {
public void main(String[] args) {
System.out.println("new Mobile!"); //Display the string.
}
}
public static void buildPhones(){
Mobile Samsung = new Mobile("Samsung", 3, 4, 8, "verizon",
"GPS");
Mobile Blackberry = new Mobile("Blackberry", 3, 4,
8, "verizon", "GPS");
}
public static void main(String[] args) {
buildPhones();
}
}
但是，当我尝试添加此代码时：
//Mutator for newserviceprovider
public void setnewserviceprovider(String newserviceprovider)
{
this.newserviceprovider = newserviceprovider;
}
//Mutator for contracttype
public void setcontracttype(String contracttype)
{
this.contracttype = contracttype;
}
上面添加的代码：
/**
* to write a simple java class Mobile that models a mobile phone.
*
* @author (jamal)
* @version (1/10/13)
*/
public class Mobile
{
// type of phone
private String phonetype;
// size of screen in inches
private int screensize;
// menory card capacity
private int memorycardcapacity;
// name of present service provider
private String mobileServiceProvider;
// type of contract with service provider
private int typeofcontract;
// camera resolution in megapixels
private int cameraresolution;
// the percentage of charge left on the phone
private int checkcharge;
// wether the phone has GPS or not
private String GPS;
// instance variables - replace the example below with your own
private int x;
// The constructor method
public Mobile(String mobilephonetype, int mobilescreensize,
int mobilememorycardcapacity, String mobileServiceProvider, int mobilecameraresolution, String mobileGPS) {
this.phonetype = mobilephonetype;
this.screensize = mobilescreensize;
this.memorycardcapacity = mobilememorycardcapacity;
this.mobileServiceProvider = mobileServiceProvider;
this.cameraresolution = mobilecameraresolution;
this.GPS = mobileGPS;
// you do not use this ones during instantiation,you can remove them if you do not need or assign them some default values
//this.serviceprovider = newserviceprovider;
//this.typeofcontract = 12;
//this.checkcharge = checkcharge;
// Mobile samsungPhone = new Mobile(
// "Samsung" // String mobilephonetype
//, 1024 // int mobilescreensize
//, 2 // int mobilememorycardcapacity
//, 8 // int mobilecameraresolution
//, "GPS" //String mobileGPS
//, "verizon" // String newserviceprovider
//);
//typeofcontract = 12;
//checkcharge = checkcharge;
}
//Mutator for newserviceprovider
public void setmobileServiceProvider(String mobileServiceProvider)
{
this.mobileServiceProvider = mobileServiceProvider;
}
// A method to display the state of the object to the screen
public void displayMobileDetails() {
System.out.println("phonetype: " + phonetype);
System.out.println("screensize: " + screensize);
System.out.println("memorycardcapacity: " + memorycardcapacity);
System.out.println("cameraresolution: " + cameraresolution);
System.out.println("GPS: " + GPS);
System.out.println("mobileServiceProvider: " + mobileServiceProvider);
System.out.println("typeofcontract: " + typeofcontract);
}
/**
* The mymobile class implements an application that
* simply displays "new Mobile!" to the standard output.
*/
public class mymobile {
public void main(String[] args) {
System.out.println("new Mobile!"); //Display the string.
}
}
public static void buildPhones(){
Mobile Samsung = new Mobile("Samsung", 3, 4, 8, "verizon",
"GPS");
Mobile Blackberry = new Mobile("Blackberry", 3, 4,
8, "verizon", "GPS");
}
public static void main(String[] args) {
buildPhones();
}
}
我收到错误消息无法找到符号 - 变量mobileserviceprovider
任何答案。我真的很失落，我会非常感谢你们的帮助。
答案 0 :(得分：1)
编译错误告诉您mobileserviceprovider类中没有名为Mobile的类实例变量。添加
private String mobileServiceProvider;
Java命名约定显示变量使用 camelCase 来命名变量，例如： mobileServiceProvider
读