2D array user input - multidimensional-array

Question

hello everyone i am new to java and i need help on this assignment that our teacher gave us... here is my programm... the objective is everytime i choose a course and time the output will display 1 and everytime the user choose a course or a schedule the output fills up.... sorry if i cant explain it clearly my english is bad.....
import java.io.*;
public class Array2D_input {
public static void main(String[] args)throws IOException {
BufferedReader in= new BufferedReader(new InputStreamReader(System.in));
int X=0;
int num=0;
String [] subject={" ","C#Programming","Autocad","Robotics","JavaProgramming"};
String [] time={" ","8:00 - 12:00","12:00 - 4:00","4:00 - 8:00"};
int [][] N=new int[5][4];
do{
System.out.println("SUBJECT ENROLLMENT\n");
System.out.println("Subjects Offered");
for(int s=1;s<=4;s++)
{
System.out.print(" "+s+" - "+subject[s]);
System.out.println();
}
System.out.println();
System.out.print("YOUR CHOICE : ");
int a=Integer.parseInt(in.readLine());
N[4][a]++;
for(int t=1;t<=3;t++)
{
System.out.print(" "+t+" - "+time[t]);
System.out.println();
}
System.out.print("TIME SCHEDULE : ");
int tm=Integer.parseInt(in.readLine());
num=num+1;
System.out.print("More Entries <Y/N> : ");
X=in.readLine().charAt(0);
}
while(X=='Y');
//System.out.print("\n\tENROLLMENT SUMMARY\n");
System.out.print("\t\t TIME SCHEDULE\n");
System.out.print("SUBJECTS\t 8:00-12:00\t 12:00-4:00\t 4:00-8:00\t total" );
for(int s=0; s<5; s++)
{
System.out.print(""+subject[s]);
System.out.println();
for(int t=0; t<4; t++)
System.out.print("\t\t\t "+N[s][t]);
System.out.println();
}
}
}

Answer 1

Here is the revised code for your task, Hope it will help you.
import java.io.*;
public class Array2D_input {
public static void main(String[] args) throws IOException {
BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
String x = "";
String[] subject = { "C#Programming", "Autocad", "Robotics", "JavaProgramming" };
String[] time = { "8:00 - 12:00", "12:00 - 4:00", "4:00 - 8:00" };
int[][] N = new int[subject.length][time.length];
// Initializing array with default values
for (int i = 0; i < subject.length; i++) {
for (int j = 0; j < time.length; j++) {
N[i][j] = 0;
}
}
do {
System.out.println("SUBJECT ENROLLMENT\n");
System.out.println("Subjects Offered");
for (int s = 0; s < subject.length; s++) {
System.out.print(" " + (s + 1) + " - " + subject[s]);
System.out.println();
}
System.out.println();
System.out.print("YOUR CHOICE : ");
int a = readNumber(in, subject.length);
for (int t = 0; t < time.length; t++) {
System.out.print(" " + (t + 1) + " - " + time[t]);
System.out.println();
}
System.out.print("TIME SCHEDULE : ");
int tm = readNumber(in, time.length);
N[a - 1][tm - 1]++;
System.out.print("More Entries <Y/N> : ");
x = in.readLine();
} while (x.equalsIgnoreCase("Y"));
// System.out.print("\n\tENROLLMENT SUMMARY\n");
System.out.print("\t\t TIME SCHEDULE\n");
System.out.print("SUBJECTS\t 8:00-12:00\t 12:00-4:00\t 4:00-8:00\t Total");
for (int s = 0; s < subject.length; s++) {
int count = 0;
System.out.println();
System.out.println(subject[s]);
for (int t = 0; t < time.length; t++) {
System.out.print("\t\t " + N[s][t]);
count += N[s][t];
}
System.out.print("\t\t " + count);
}
}
/**
* Function to read input from the console and also check for max value
*
* #param in
* #param maxLimit
* #return
* #throws IOException
*/
public static int readNumber(BufferedReader in, int maxLimit) throws IOException {
int choice = 0;
try {
choice = Integer.parseInt(in.readLine());
} catch (NumberFormatException nf) {
System.out.println("Enter integer only:");
choice = readNumber(in, maxLimit);
}
if (choice > maxLimit) {
System.out.println("Enter only given options");
choice = readNumber(in, maxLimit);
}
return choice;
}
}

Answer 2

java 2d array input example:
//Coded BY Anurag Goel
//Basic 2DArray Program
import java.util.Scanner;
public class array2d {
public static void main(String args [])
{
int [][] arr =new int[5][5];
System.out.println("Enter student roll no and their subject codes");
Scanner o = new Scanner(System.in);
for(int i=0;i<5;i++)
{
System.out.println("Enter "+(i+1)+"th student subject codes ");
for(int k=0;k<5;k++)
{
System.out.println("Enter "+(k+1)+"th subject code : ");
arr[i][k]=o.nextInt();
}
}
for(int j=0;j<5;j++)
{
System.out.print(""+(j+1)+"th student subject codes ");
for(int l=0;l<5;l++)
{
System.out.print(" "+arr[j][l]+" ");
}
System.out.println("");
}
}
}