方法返回零

Question

这是假设返回19个全座位和68名学生剩余价值！ 请帮助，我的理解是我返回正确的值并将它们分配给正确的变量！

public class JetCalculator 
{ 
    public static void main(String[] args) 
    { 
     int totalStudents = 3013; 
     int jetCapacity = 155; 
     int jets; 
     int students; 
     jets = calculateJets(jetCapacity, totalStudents); 
     students = calculateStudents(jetCapacity, totalStudents, jets); 

     System.out.println("A total of "+ totalStudents + " student require "+ jets + " full seated jets."); 
     System.out.println("There will be " + students + " students remaining"); 
     System.out.println("_____________________________________________"); 
     System.out.println(jets); 
     System.out.println(jetCapacity); 
     System.out.println(students); 
    } 

    public static int calculateJets(int totalStudents, int jetCapacity) 
    { 
     int fullJets; 
     fullJets = totalStudents/jetCapacity; 
     return fullJets; 
    } 

    public static int calculateStudents(int jetCapacity, int totalStudents, int jets) 
    { 
     int remainingStudents; 
     remainingStudents = jetCapacity * jets; 
     return remainingStudents; 
    } 
} 

Answer 1

您正在将参数传回给前端。

您通过传递容量然后给学生打电话calculateJets：calculateJets(jetCapacity, totalStudents);但方法要求学生容量：calculateJets(int totalStudents, int jetCapacity)。

这是在整个类接口中参数顺序一致性的一个好参数。

为了帮助调试这在未来尝试的方法开始在println扔，看看发生了什么：

System.out.println("Called calculateJets with totalStudents of " + totalStudents + " and jetCapacity of " + jetCapacity); 

Answer 2

纯粹基于方法的名字：你的意思是说remainingStudents = totalStudents - (jetCapacity * jets);？

Answer 3

你叫calculateJets这样

jets = calculateJets(jetCapacity, totalStudents); 

但此方法的参数名意味着您切换呼叫

public static int calculateJets(int totalStudents, int jetCapacity) 

这意味着你实际上在做155/3013他们为了这是0使用整数算术。