[Solved] Match process between right answers and randomly selected student grades

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I have read your comment and I think you just need to place ID, name, lastName variables outside of your main function and make them static. You can also do this with the key array. This way other methods can work with these variables.

import java.util.Random;
public class YEAH {
    private static final Random randomChar=new Random();

    private static String studentID[][] = new String [3][4];
    private static String studentName[][]= new String[3][4];
    private static String studentLastName[][]= new String [3][4];
    private static char key[]={'a','b','c','e','d','b','a','b','a','e'};

    public static void main(String[] args) {
        //your code here...
    }
    //...

EDIT
EDIT2

So this code will count the points of each person and displays it. Hope it helps.

import java.util.Random;
public class YEAH
{
    private static final Random randomChar=new Random();
    private static String studentID[][] = new String [3][4];
    private static String studentName[][]= new String[3][4];
    private static String studentLastName[][]= new String [3][4];
    private static char key[]={'a','b','c','e','d','b','a','b','a','e'};
    private static int studentPoints[][]=new int[3][4]
    private static int studentGrades[][]=new int[3][4];  //points*10
    private static char[][][] studentAnswers = new char[3][4][10];
        //store the answers given by students

    public static void main(String[] args)
    {
        studentName[0][0]="Cagatay";
        studentName[0][1]="Serhat";
            //... your code ...
        studentID[2][2]="D3";
        studentID[2][3]="D4";
        generateRandomAnswers();
        countPoints();
        PrintResults();
    }

    private static void PrintResults() {
        for (int i = 0; i < 3; i++)
        {
            for (int j = 0; j < 4; j++)
            {
                System.out.Println(studentPoints[i][j] + "\t" +
                    studentID[i][j] + "\t" +
                    studentName[i][j] + "\t" +
                    studentLastName[i][j]);
            }
        }
    }

    private static void countPoints() {
        for (int i = 0; i < 3; i++)
        {
            for (int j = 0; j < 4; j++)
            {
                for (int k = 0; k < 10; k++)
                {
                    studentPoints[i][j] = 0;
                    if (studentAswers[i][j][k] == key[i][j][k])
                    {
                        studentPoints[i][j]++;
                    }
                    studentGrades[i][j] = 10 * studentPoints[i][j];
                }
            }
        }
    }

    private static void generateRandomAnswers() {
        Random rnd = new Random();
        String alphabet="abcde";
        for (int i = 0; i < 3; i++)
        {
            for (int j = 0; j < 4; j++)
            {
                for (int k = 0; k < 10; k++)
                {
                    studentAnswers[i][j][k]=alphabet.charAt(randomChar.nextInt(5));
                }
            }
        }
    }
}

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solved Match process between right answers and randomly selected student grades