Question

我有一个Course.java代码和Period.java代码。在Course.java代码中，有一个公共的Period getPeriod（）;方法和这个方法里面我想返回Period。但是，我不知道我该怎么做。任何人都可以指导我正确的方向吗？谢谢！

Course.java

课程课程{

int department;
int courseNum;
String name;
char day;
int timeSlot;
int credits;
Student students[] = new Student[20];

private Period period;

public Course(int department, int courseNum, String name, char day, int timeSlot, int credits) {
    this.department = department;
    this.courseNum = courseNum;
    this.name = name;
    this.day = day;
    this.timeSlot = timeSlot;
    this.credits = credits;
}

public int getDepartment() {
    return department;
}

public int getCourseNumber() {               
    return courseNum;
}


public String getName() {
    return name;
}

public Course(Period period){
    this.period = period;
}

public Period getPeriod() {
    return period;
}


public int getCredits() {
    return credits;
}

public Student[] getRoster() {
    return students;
}

public String toString(){
    return ""+this.department+":"+this.courseNum+" " +"["+this.name+"]"+" "+this.period +" " + "credits:"+this.credits;
}

public boolean equals(Course other){
    return courseNum==other.courseNum && department==other.department;
}

}

Period.java 公共课时段{

private char day;
private int timeSlot;

public static void main(String[] args){

    Period p1 = new Period('M', 2);
   Period p2 = new Period('M', 2);
   Period p3 = new Period('F', 4);
   int status = p1.compareTo(p2);
   if(status == 0){
       System.out.println(p1 + " is equal to " + p2);
   }
   else if(status == -1){
       System.out.println(p1 + " comes before " + p2);
   }
   else{
       System.out.println(p1 + " comes after " + p2);
   }
   status = p1.compareTo(p3);
   if(status == 0){
       System.out.println(p1 + " is equal to " + p3);
   }
   else if(status == -1){
       System.out.println(p1 + " comes before " + p3);
   }
   else{
       System.out.println(p1 + " comes after " + p3);
   }

}

public Period(char day, int timeSlot){
     if(day >= 'a' && day <= 'z'){
       day = (char) (day + (int)'A' - (int)'a');   // converting to uppercase here
   }
    this.day = day;
    this.timeSlot = timeSlot;

}

public char getDay(){
    return this.day;
}

public int getTimeSlot(){
    return this.timeSlot;
}

public String toString(){

    return ""+this.day + this.timeSlot;
}

 public boolean equals(Period p){
   return day == p.day && timeSlot == p.timeSlot;

}

public int compareTo(Period other){
   if(equals(other)){
       return 0;
   }
   else{
       if(other.day == day){
           if(timeSlot < other.timeSlot){
               return -1;
           }
           else{
               return 1;
           }
       }
       else{
           String days = "SMTWF";
           int ind1 = days.indexOf(day);
           int ind2 = days.indexOf(other.day);
           if(ind1 < ind2){
               return -1;
           }
           else{
               return 1;
           }
       }
   }

}

public void setTimeSlot(char newSlot){
    int count = 1;
    while (count !=0){
        if ((newSlot < 1) || (newSlot > 9)){
            System.out.println("Time Slot must be between 1-9");
        }
        else {
            this.timeSlot = newSlot;
            count = 0;
        }
    }


}

}

Answer 1

在Course课程中，制作Period类型的实例变量，如下所示：

private Period period;

public Course(Period period) {
    this.period = period;
}

public Period getPeriod() {
    return period;
}

Java（如何在另一个类getter中实现一个类？）

1 个答案: