java - 正确调用方法: (Java)

Question

Create a method named getNextProjectIndex() that returns an int that gets the next index of the projects array that contains a -1.0. Find the next item in the projects array that contains a -1.0 and return that index of the array. This method should return -1 if the array is full. -1 is a common flag to indicate failure in methods that should only return non-negative integers.

我在主方法中调用此方法时遇到问题。问题在于我的 getNextProjectIndex 方法还是我的 main 方法如何调用它？

  public double getNextProjectIndex()
  {
    int i = 0;
    int full = -1;
    while(i < projects.length)
    {
      if (projects[i] == -1)
      {

        return i;
      }
      else if (i == (projects.length - 1) && projects[i] != -1)
      {
        return full;
      }

    }

    return i;

  }

这是我的主要方法:

public class Main {

  public static void main(String [ ] args)
  {
    Student testStudent = new Student("BL", "Hill", 34);
    int i = 0;
    System.out.println(testStudent.getFname() + " " + testStudent.getLname() );

    while(i < 5)
    {
      if(testStudent.getNextProjectIndex() != 0)
      {      
        testStudent.setProjectScore(10.0, i);
        System.out.println("Scores are: "+ testStudent.getProjectScore(i));
      }  


      i++;
    }


  }

}

当程序运行时，仅显示 1 个分数，而不是 5 个分数。它没有完全贯穿循环。如果数组中的所有槽都已填满，则该方法只应返回 -1。

Answer 1

Create a method named getNextProjectIndex() that returns an int

您已将您的方法声明为返回 double，即使规范规定返回 int，并且您尝试在函数中返回 int i:

public double getNextProjectIndex()
       ^^^^^^