如何將void方法結果存儲到int數組方法中

Question

我正在嘗試將公共靜態void readGrades（）的結果存儲到方法數組int [] grades中。 但是我沒有這樣做。 我不幸地嘗試了ArrayList和其他東西。

public static int[]grades;
public static void main(String[] args) {
        readGrades();
}
public static void readGrades(){
    Scanner in=new Scanner(System.in);
    System.out.print("How many students there are : ");
    int numberOfStudents=in.nextInt();
    for(int i=1;i<=numberOfStudents;i++){
    System.out.print("Enter the grade of the students : ");
    int grades1=in.nextInt();
    grades1++;
}

Answer 1

試試這個：

public static int[] grades;
public static void main(String[] args) {
        readGrades();
}
public static void readGrades(){
    Scanner in=new Scanner(System.in);
    System.out.print("How many students there are : ");
    int numberOfStudents=in.nextInt();
    grades=new int[numberOfStudents];
    for(int i=0;i<numberOfStudents;i++){
        System.out.print("Enter the grade of the students : ");
        int grade=in.nextInt();
        grades[i]=grade;
     }
}

您必須知道這會將數據存儲在grades數組中，並且可以在調用readGrades（）方法之前使用它，嘗試編寫在readGrades（）之后打印成績的代碼。

Answer 2

您無需將grades[] static聲明grades[] static ，也可以使用locally declared int[] ，如下所示：

public static void main(String[] args) {
        Scanner in=new Scanner(System.in);
        System.out.print("How many students there are : ");
        int numberOfStudents=in.nextInt();
        int[] grades = new int[numberOfStudents];
        readGrades(grades, in);
        // here you can write code to play with grades array
}
public static void readGrades(int[] grades, Scanner in){
    for(int i=0;i<numberOfStudents;i++){
         System.out.print("Enter the grade of the students : ");
         grades[i]=in.nextInt();
    }
}

希望這可以幫助。