如何根據布爾方法的結果列印一些東西？

我有兩種方法

*`public boolean validateMarks() {
    return (this.qualifyingMarks >= 65 && this.qualifyingMarks <= 100);
    }   
    public boolean validateCourseId() {
    return (this.courseId >= 1001 && this.courseId <= 1005);
    }`*

validateMarks()：用于驗證合格考試成績 - 合格成績在 65 到 100 之間（含）用于計算折扣后的課程費用。

因此，當小于 65 時列印列印“不合格，您失敗了”，當課程無效時“課程不正確，請使用正確的課程編號重試”

這是我的 calculateCourseFee 方法

***if(this.validateMarks()) {
            this.courseFee = fee - (fee * discount);
            
            System.out.println("****Course Allocation Details****"   "\n"  
                    "Student Name: "   this.getStudentName()   "\n"   
                    "Course Id: "   this.getCourseId()   "\n"  
                    "Qualifying Exam Marks: "   this.getQualifyingMarks()   "\n"  
                    "Student's Registration Id: "   this.getRegistrationId()   "\n"  
                    "Total Course Fee: "   this.getCourseFee()   "\n"  
                    "Hostel Required: "   hostel);
        }else {
            System.out.println("wrong for marks ");
        }
        
        if(this.validateCourseId()) {
            this.courseFee = fee - (fee * discount);
            
            System.out.println("****Course Allocation Details****"   "\n"  
                    "Student Name: "   this.getStudentName()   "\n"   
                    "Course Id: "   this.getCourseId()   "\n"  
                    "Qualifying Exam Marks: "   this.getQualifyingMarks()   "\n"  
                    "Student's Registration Id: "   this.getRegistrationId()   "\n"  
                    "Total Course Fee: "   this.getCourseFee()   "\n"  
                    "Hostel Required: "   hostel);
        }else {
            System.out.println("Wroog for course");
        }
        ***

I make two different ifs for the two requirements, but everytime I run it, it prints the else statement to, even if marks is greather than 65... am I missing something?

Reviewing my code and tell me what am I missing or what am I doing wrong

uj5u.com熱心網友回復：

您在此處顯示的代碼部分似乎按預期作業。

public class Driver {
  public static void main(String args[]) {
    Eligible e1 = new Eligible();
    e1.calculateCourseFee();
  }
}

class Eligible{
int qualifyingMarks = 66;
int courseId = 1002;

public boolean validateMarks() {
    return (this.qualifyingMarks >= 65 && this.qualifyingMarks <= 100);
    }   

public boolean validateCourseId() {
    return (this.courseId >= 1001 && this.courseId <= 1005);
    }

public void calculateCourseFee(){
    if(this.validateMarks()) {
        System.out.println("works for marks");
    }else {
        System.out.println("wrong for marks ");
    }
    
    if(this.validateCourseId()) {
        System.out.println("works for course");
    }else {
        System.out.println("Wroog for course");
    }
  }
}

輸出：

為分數
作業 為課程作業

也許問題在于您如何設定qualifyingMarks和courseId變數的值？

uj5u.com熱心網友回復：

我希望我能給你一個喜歡或豎起大拇指，我終于做到了，感謝你給我的所有答案，我只是將兩個 if 合二為一。這是代碼：

if(this.validateCourseId() && this.validateMarks()) {
             this.courseFee = fee - (fee * discount);
                
                System.out.println("****Course Allocation Details****"   "\n"  
                        "Student Name: "   this.getStudentName()   "\n"   
                        "Course Id: "   this.getCourseId()   "\n"  
                        "Qualifying Exam Marks: "   this.getQualifyingMarks()   "\n"  
                        "Student's Registration Id: "   this.getRegistrationId()   "\n"  
                        "Total Course Fee: "   this.getCourseFee()   "\n"  
                       "Hostel Required: "   hostel);
        }else if(!this.validateCourseId()) {
            System.out.println("Wrong course");
        }
        else if(!this.validateMarks()) {
            System.out.println("You've failed");
        }

感謝大家！！

uj5u.com熱心網友回復：

可能qualifyingMarks 為零或其他值，在方法“validateMarks”中列印qualifyingMarks，你會得到你的問題的原因。

標籤：爪哇 哎呀 if 语句

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