Added an attempt of looping doesn't work

src/Yeyey1.java

@@ -3,7 +3,6 @@ import java.util.Scanner;
 
 public class Yeyey1 {
 	
-	//--------------------------------------------------Setup Phase--------------------------------------------------\\
 	static Scanner input = new Scanner(System.in); //We're just setting up the input for now;
 	static String[] seat = new String[100];
 	static int j=0,k=0,mainSeatNumber=0,classRead;
@@ -24,6 +23,9 @@ public class Yeyey1 {
 		
 		ShowSeats();
 
+		while(classRead!=4)
+		{
+		
 		System.out.println("For First Class please input 1");
 		System.out.println("For Business Class please input 2");
 		System.out.println("For Economy Class please input 3");
@@ -32,6 +34,7 @@ public class Yeyey1 {
 		BookSeats(classRead);
 		
 		ShowSeats();
+		}
 		
 	}
 
@@ -42,24 +45,21 @@ public class Yeyey1 {
 		{
 			System.out.println("Please select a seat from 01 to 18");
 			{
-				mainSeatNumber = input.nextInt();
-				seat[mainSeatNumber - 1] = "XX";
+				OccupySeats();
 			}
 		}
 		else if(mainClass == 2)
 		{
 			System.out.println("Please select a seat from 19 to 45");
 			{
-				mainSeatNumber = input.nextInt();
-				seat[mainSeatNumber - 1] = "XX";
+				OccupySeats();
 			}
 		}
 		else if(mainClass == 3)
 		{
 			System.out.println("Please select a seat from 46 to 90");
 			{
-				mainSeatNumber = input.nextInt();
-				seat[mainSeatNumber - 1] = "XX";
+				OccupySeats();
 			}
 		}
 	} 
@@ -114,4 +114,13 @@ public class Yeyey1 {
 		AssignSeats(45,90);
 	}
 	
+	public static void OccupySeats()
+	{
+		mainSeatNumber = input.nextInt();
+		if(seat[mainSeatNumber] !="XX")
+		{
+		seat[mainSeatNumber - 1] = "XX";
+		}else System.out.println("Seat is already occupied");
+	}
+
 }