public static boolean equals方法不按需要比较字符串

Question

The Grades & Courses are not equal...

Course Title: Physics
Grade: A-

Course Title: Physics
Grade: A-

以上是我的输出。情况应该不是这样......我在其他类中使用Equals方法（比较字符串的内容），如下所示：

//Equals Method
public static boolean equals(CourseGrade a, CourseGrade b) {
    return a.getCourse().equalsIgnoreCase(b.getGrade());

一切似乎都是狡猾的 - 我没有抛出任何错误。但是，正如您从输出中看到的那样，答案是错误的。它应该是假的，并且它应该输出一行，“等级和课程不相等......”为清楚起见：

public static void main(String[] args) {
    CourseGrade a = new CourseGrade("Physics", "A-");
    CourseGrade b = new CourseGrade("Physics", "A-");

    if (a.equals(b)){
        System.out.println("The Grades & Courses are equal...");
    }
    else {
        System.out.println("The Grades & Courses are not equal...");
    }

    System.out.println();
    System.out.println(a.toString());
    System.out.println(b.toString());

我错过了什么？