String[]getter无法返回Array.ToString（String[])

Question

public class NewRegandLogin {

private String alumniFirstName; 
private String alumniLastName;
private String alumniId;
private  Scanner scanner = new Scanner(System.in);
private String linkedInPage;
static ArrayList<NewRegandLogin> loginInformation = new ArrayList<>();
private  String alumniIdImput;
private  String passwordImput;
private String permanentPasword;
private String[] coursesList;

public NewRegandLogin(String alumniFirstName, String alumniLastName,String alumniId, String[] coursesList, String linkedInPage, String permanentPasword) {
    this.alumniFirstName=alumniFirstName;
    this.alumniLastName = alumniLastName;
    this.alumniId = alumniId;
    this.coursesList = coursesList;
    this.linkedInPage = linkedInPage;
    this.permanentPasword = permanentPasword;       
}
public  void registerNewGrad() {...}
    
public String getAlumniFirstName() {...}

public void setAlumniFirstName(String alumniFirstName) {...}

public String getAlumniLastName() {...}
    
public void setAlumniLastName(String alumniLastName) {...}
    
public void setAlumniId(String alumniId) {...}
        
public String getAlumniId() {...}

void login() {...}
        
void idVerification() {...} 
    
void passwordInsertion() {...}
    
void oTpVerification() {...}
        
static char[] oTp (int length) {...}        
                
void permanentPassword(){...}
    
public boolean isValidPassword(String permanentPasword) {...}
    
public void setPermanentPassword(String permanentPasword) {...}
    
public String getPermanentPassword() {...}

public void setLinkedInPage(String linkedInPage) {...}
    
public String getLinkedInPage() {...}
    
public void setAlumniCourses() {
    
    coursesList = new String[10];
        
    for (int i=0; i < coursesList.length; i++) {
        if(coursesList[i]==null) {
            System.out.println("Completed Course Name: ");
            coursesList[i]=scanner.next();
        }
        if(coursesList[i].equals("s") || coursesList[i].equals("S")) {
            break;
        }
    }
}

public String[] getCourses() {
    return Arrays.toString(coursesList);
}

static NewRegandLogin newRegAndLogin = new NewRegandLogin(null, null, null, null, null, null);

public static void main(String[] args) {

    System.out.println("        WELCOME TO THE ALUMNI SHE-CODES SYSTEM        ");
    System.out.println("_________________________________\n   - New Alumni registration - \n");
    System.out.println("");
    newRegAndLogin.registerNewGrad();
    System.out.println();
    System.out.println("_________________________________");
    System.out.println();   
    System.out.println("Your new Alumni ID is: "  + newRegAndLogin.getAlumniId());
    System.out.println();
    System.out.println("Your temporary password is:");
    System.out.println(newRegAndLogin.oTp(8));
    System.out.println("_________________________________");
    System.out.println("_________________________________\n   - Alumni Login - \n");
    System.out.println("");
    newRegAndLogin.login();
    System.out.println(""); 
    System.out.println("Please make a list of completed Courses: (Enter S to stop adding courses) ");
    newRegAndLogin.setAlumniCourses();
    //newRegAndLogin.setLinkedInPage(null);
    NewRegandLogin.loginInformation.add(new NewRegandLogin(newRegAndLogin.getAlumniFirstName(), newRegAndLogin.getAlumniLastName(),
            newRegAndLogin.getAlumniId(),newRegAndLogin.getCourses(), newRegAndLogin.getLinkedInPage(), newRegAndLogin.getPermanentPassword()));
    printAlumniProfile();
    }
        
public static void printAlumniProfile() {
    for (int i = 0; i<NewRegandLogin.loginInformation.size();i++) {
        System.out.println(((i+1)+"-"+ NewRegandLogin.loginInformation.get(i)));
        System.out.println();
    }           
}}

Answer 1

public String[] getCourses() {
    return Arrays.toString(coursesList);
}

arrays.toString返回字符串，而不是字符串[]。如果要返回字符串，请将返回类型更改为字符串。

如果要返回包含CoursesList字符串表示形式的单元素数组，可以将字符串包装在数组中：

public String[] getCourses() {
    return new String[]{Arrays.toString(coursesList)};
}

如果要返回数组，只需返回数组：

public String[] getCourses() {
    return coursesList;
}

public String[] getCourses() {
    return Arrays.copyOf(coursesList, coursesList.size());
}