Java 错误，找不到符号 - 类字符串
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Java error, cannot find symbol - class string
提问by user2898828
I am trying to get my code to create the new constructor objects which I require to create a mobile phone object. I have tried naming the constuctor fields to create the object.
我试图让我的代码创建新的构造函数对象，我需要创建一个移动电话对象。我尝试命名构造函数字段来创建对象。
UPDATE: I have amended stringto be String, however now when I update it I get the error:
更新：我已修改string为String，但是现在更新时出现错误：
error: constructor Mobile(java.lang.String,int,int,java.lang.String,int,java.lang.String) is already defined in class Mobile
This error comes up at the bottom of the page at:
此错误出现在页面底部：
public Mobile(String MobilephoneType, int Mobilescreensize, int Mobilememorycardcapacity, String newserviceprovider, int Mobilecameraresolution,
String MobileGPS) {
What does this error mean?
这个错误是什么意思？
The code so far:
到目前为止的代码：
/**
* to write a simple java class Mobile that models a mobile phone.
*
* @author (Lewis Burte-Clarke)
* @version (14/10/13)
*/
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, String newserviceprovider, int mobileCameraResolution,
String mobileGPS) {
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;
}
// 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);
}
public Mobile(String MobilephoneType, int Mobilescreensize, int Mobilememorycardcapacity, String newserviceprovider, int Mobilecameraresolution,
String MobileGPS) {
this.phonetype = Mobilephonetype;
this.screensize = 3;
this.memorycardcapacity = 4;
this.cameraresolution = 8;
this.GPS = GPS;
this.serviceprovider = newserviceprovider;
this.typeofcontract = 12;
this.checkcharge = checkcharge;
}
}
class mymobile {
public static void main(String[] args) {
Mobile Samsung = new Mobile("Samsung", "3", "4", "8",
"GPS");
Mobile Blackberry = new Mobile("Blackberry", "3.", "4",
"8", "GPS");
Samsung.displayMobileDetails();
Blackberry.displayMobileDetails();
}
}
回答by Reimeus
回答by dtgee
stringshould be uppercase S. You have your string type as lower case s
string应该是大写的 S。你的字符串类型是小写的 s
private String phonetype;
Java is case-sensitive. Stringis a class that extends from the Object class, which is why it's capitalized, just like Integer. However, primitive types are not capitlized (i.e. boolean, int, char).
Java 区分大小写。String是一个从 Object 类扩展而来的类，这就是它大写的原因，就像Integer. 但是，原始类型没有大写（即boolean, int, char）。
回答by CamHart
Make the s in string capitalized. It's case sensative.
使字符串中的 s 大写。区分大小写。
http://docs.oracle.com/javase/7/docs/api/java/lang/String.html
http://docs.oracle.com/javase/7/docs/api/java/lang/String.html
