Finished

AirlineReservation/src/airline.java

 import java.util.Scanner; //import scanner
 import java.util.Random; //I don't know the requirements for generating a flight code, so I will generate one randomly
+import java.util.Arrays;
+import java.util.List;
 public class airline {
 		static String plane[][] = {{"01", "02", "03"}, {"04", "05", "06"}, {"07", "08", "09"}, // set plane as global variable
 			{"10", "11", "12"}, {"13", "14", "15"}, {"16", "17", "18"}, 
@@ -22,7 +24,6 @@ public class airline {
     static Random random = new Random();
 	
     public static void main(String[] args) {
-    	System.out.print(plane[0][0]);
     	details(); //to allow repeatability at the end of the program
     }
     
@@ -72,9 +73,9 @@ public class airline {
 		boolean	available = false;
 		
 		System.out.println("You have chosen First Class"); //confirms class
-		for(int i=0; i<1; i++) {
+		for(int i=0; i<6; i++) {
 			for(int j=0; j<3; j++) {
-				if(plane[i][j] != "XX") {
+				if(!plane[i][j].contentEquals("XX")) {
 						available = true; //checking if seats are available
 				}
 				else
@@ -107,9 +108,9 @@ public class airline {
 		boolean	available = false;
 		
 		System.out.println("You have chosen Business"); //confirms class
-		for(int i=2; i<4; i++) {
+		for(int i=6; i<15; i++) {
 			for(int j=0; j<3; j++) {
-				if(plane[i][j] != "XX") {
+				if(!plane[i][j].contentEquals("XX")) {
 						available = true; //checking if seats are available
 				}
 				else
@@ -145,9 +146,9 @@ public class airline {
 		boolean	available = false;
 		
 		System.out.println("You have chosen Economy"); //confirms class
-		for(int i=5; i<9; i++) {
+		for(int i=15; i<30; i++) {
 			for(int j=0; j<3; j++) {
-				if(plane[i][j] != "XX") {
+				if(!plane[i][j].contentEquals("XX")) {
 						available = true; //checking if seats are available
 				}
 				else
@@ -201,7 +202,7 @@ public class airline {
 		case "First Class":
 			for(int i=0; i<1; i++) {
 				for(int j=0; j<3; j++) {
-					if(plane[i][j] != "XX") { //checks through seats, finds one that hasn't been filled yet
+					if(!seat.contentEquals(plane[i][j]))  { //checks through seats, finds one that hasn't been filled yet
 						seat = plane[i][j];
 						plane[i][j] = "XX";
 						break;
@@ -211,7 +212,7 @@ public class airline {
 		case "Business":
 			for(int i=2; i<4; i++) {
 				for(int j=0; j<3; j++) {
-					if(plane[i][j] != "XX") { //checks through seats, finds one that hasn't been filled yet
+					if(!seat.contentEquals(plane[i][j]))  { //checks through seats, finds one that hasn't been filled yet
 						seat = plane[i][j];
 						plane[i][j] = "XX";
 						break;
@@ -221,7 +222,7 @@ public class airline {
 		case "Economy":
 			for(int i=5; i<9; i++) {
 				for(int j=0; j<3; j++) {
-					if(plane[i][j] != "XX") { //checks through seats, finds one that hasn't been filled yet
+					if (!seat.contentEquals(plane[i][j]))  { //checks through seats, finds one that hasn't been filled yet
 						seat = plane[i][j];
 						plane[i][j] = "XX";	
 						break;
@@ -242,44 +243,54 @@ public class airline {
 		switch(fclass) {
 			case "First Class":
 			seat = input.next();
-			for(int i=0; i<6; i++)
-				for(int j=0; j<3; j++) {
-					System.out.println(plane[i][j]);
-					if (seat == plane[i][j]) 
-						plane[i][j] = "XX";
-				}
 			if (Integer.parseInt(seat) > 18) { //making sure the seat they choose is in their chosen class
 				chooseseat(fclass);	}
-			boardingpass(fclass);//loads up the boarding class
+				for(int i=0; i<6; i++)
+					for(int j=0; j<3; j++) {
+						if (seat.contentEquals(plane[i][j])) {				
+							plane[i][j] = "XX";
+							if (Integer.parseInt(seat) > 18) { //making sure the seat they choose is in their chosen class
+								chooseseat(fclass);	}
+							boardingpass(fclass);//loads up the boarding class
+						}
+				}
+				System.out.println("Sorry, that seat is taken");
+				chooseseat(fclass);
 			break;
 			case "Business":
 			seat = input.next();
-			for(int i=6; i<15; i++) {
-				for(int j=0; j<3; j++) {
-					if (seat == plane[i][j])
-						plane[i][j] = "XX";
+				for(int i=6; i<15; i++) 
+					for(int j=0; j<3; j++) {
+						if (seat.contentEquals(plane[i][j])) {				
+							plane[i][j] = "XX";
+							if (Integer.parseInt(seat) < 18) {//making sure the seat they choose is in their chosen class
+								chooseseat(fclass);}
+							if (Integer.parseInt(seat) > 45) {
+								chooseseat(fclass);}
+							boardingpass(fclass);//loads up the boarding class
+						}
+						if(plane[i][j].contentEquals("XX")){
+							System.out.println("Sorry, that seat is taken");
+							chooseseat(fclass);}
 						
-				}
-				if (Integer.parseInt(seat) < 18) {//making sure the seat they choose is in their chosen class
-					chooseseat(fclass);}
-			if (Integer.parseInt(seat) > 45) {
-					chooseseat(fclass);}
-			boardingpass(fclass);//loads up the boarding class
-			}
+					}			
 			break;
 			case "Economy":
 			seat = input.next();
-			for(int i=15; i<30; i++) {
-				for(int j=0; j<3; j++) {
-					if (seat == plane[i][j])
-						plane[i][j] = "XX";
-						
-				}
-				if (Integer.parseInt(seat) < 45) {//making sure the seat they choose is in their chosen class
-					chooseseat(fclass);}
-			boardingpass(fclass);//loads up the boarding class
+				for(int i=15; i<30; i++) 
+					for(int j=0; j<3; j++) {
+						if (seat.contentEquals(plane[i][j])) {
+							plane[i][j] = "XX";
+							if (Integer.parseInt(seat) < 46) { //making sure the seat they choose is in their chosen class
+								chooseseat(fclass);	}
+							boardingpass(fclass);//loads up the boarding class
+						}	
+						if(plane[i][j].contentEquals("XX")){
+							System.out.println("Sorry, that seat is taken");
+							chooseseat(fclass);}
+					}
 			break;
-			}
+			
 			}
 		}