Java错误,找不到符号 - 类字符串

Question

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.我已经尝试命名constuctor字段来创建对象.

更新:我已修改string为String,但是现在当我更新它时,我收到错误:

error: constructor Mobile(java.lang.String,int,int,java.lang.String,int,java.lang.String) is already defined in class Mobile

此错误出现在页面底部:

public Mobile(String MobilephoneType, int Mobilescreensize, int Mobilememorycardcapacity, String newserviceprovider, int Mobilecameraresolution,
        String MobileGPS) {

这个错误是什么意思？

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();
    }
}

Answer 1

string 应为大写S.您的字符串类型为小写 s

private String phonetype;

Java区分大小写.String是一个从Object类扩展的类,这就是它大写的原因,就像它一样Integer.然而,原始类型不capitlized(即boolean,int,char).