Question

我很难过，因为Java无法找到我的数组[]是因为我在do-while循环中声明了它？但是当我在do-while循环之外声明它时，它有错误。你能救我吗？

public static void main(String[] args) {
   Scanner in=new Scanner(System.in);
   //Input number of grades.
   System.out.print("Enter No. of Grades from 5-10: ");
   int grades=0;

   do{
       grades=in.nextInt();
       int a[]=new int[grades];
       for(int i=0; i<grades; i++){
           //Inputing the grades
           System.out.print("Grades Values: ");
           int temp=0;
           //checking whether the no. grades are less than 5 or more than 10
            if(grades>11 || grades<5){
           System.out.println("INVALID!!");
           System.out.println("Enter Valid Number of Grades: ");
            }
           do{
               temp=in.nextInt();
               //checking whether the user's input of grades' values is between 0 to 100
               if(temp<0 || temp>=101){
                   System.out.println("Invalid Grade!");
                   System.out.println("Enter Valid Grade: ");
               }
           }while(temp<0 || temp>=101);
           a[i]=temp;

       }   
   }while(grades>11 || grades<5); 

   //getting Highest grade
   int highest=a[0];
   for(int i=1; i<a.length;i++){
       if(a[i]>highest){
           highest=a[i];
       }
   }
   System.out.println(highest);


}

Answer 1

是因为我在do-while循环中声明了它吗？

是

do {
    int[] a;
}
...

// a is not visible here, because it is declared within the do-block.

你应该read more about scoping。

但是当我在do-while循环之外声明它时它有错误

这取决于你是如何做到的。这应该有效：

int[] a;
do {
    grades = in.nextInt();
    a = new int[grades];
    ...
}

Java无法找到我的数组

1 个答案: