java - 无法将新的字符串实例变量添加到现有代码中

Question

嗨，我在将字符串讲师名称添加到我为类(class)名称创建的现有类(class)中时遇到问题，你能帮我修复错误 - 这给了我 8 个错误

import java.util.Scanner;

公开课成绩册 {

private String courseName, instructorName;

public GradeBook ( String name )
{
    courseName = name; 
}

public GradeBook ( String name )
{
    instructorName = name; 
}

public void setCourseName ( String name )
{
    CourseName = name;
}

public void setInstructorName ( String name )
{
    InstructorName = name;
}

public void getCourseName ( String name )
{
    return courseName;
}

public void getInstructorName ( String name )
{
    return instructorName;
}

public void displayMessage();
{
    System.out.printf( "Welcome to the grade book for\n%s!\n\n",
        getCourseName() );
    System.out.printf( "Your instructor for this course is\n%s!\n\n",
        getCourseName() );
}

}

Answer 1

From the Java Language Specification

It is a compile-time error to declare two constructors with override-equivalent signatures (§8.4.2) in a class.

和

Two methods [or constructors] have the same signature if they have the same name and argument types.

在您的例子中，您有两个构造函数，它们采用一个 String 类型的参数。换句话说，您有两个具有相同签名的构造函数，而编译器将不允许这样做。

要么使用一个带有两个 String 参数的构造函数，要么使用 setter。