How can i fix the terminated console : I am trying to do cipher game. Our teacher said it will be 2 mode. First mode will be normal mode which is one of the quote will be choosen randomly. Second mode is the test mode which is you will choose a quote. In the test mode i cant go further because it says terminated i dont know what is the problem.

    import java.util.ArrayList;
    import java.util.Random;
    import java.util.Scanner;
    
    public class main {
    
    	public static void main(String[] args) {
    	
    		Scanner in = new Scanner(System.in);
    		Random random = new Random();
    		
    
    		 char plainText[] = {'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'r', 'x', 'y', 'z'};
    	     char cipherText[] = {'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'r', 'x', 'y', 'z'};
    		
    		System.out.println("Please choose a mod: ");
    		System.out.println("1.Normal Mode");
    		System.out.println("2.Test Mode");
    		int user = in.nextInt();
    
    		String[] strings = {
    				"So  many  books  so  little  time ",
    				"Be  the  change that  you  wish to  see  in  the  world ",
    				"No  one  can  make  you  feel  inferior  without  your  consent",
    				"Love  for  all  hatred  for  none ",
    				"Die  with  memories  not  dreams",
    				"Aspire  to  inspire  before  we  expire",
    				"Whatever  you  do  do  it  well",
    				"What we  think  we  become ",
    				"Be so good they cant ignore you ",
    		};
    
    		String randomString = strings[random.nextInt(strings.length)];     
    		
    		
    		if (user==1) {
    			System.out.println(randomString);			
    		    for (int a=0;a<randomString.length();a++) {
    		    	for (int i=0; i<plainText.length;i++) {
    		    		if(plainText[i] == (randomString.charAt(a))) {
    		    			System.out.print(cipherText[i]);
    		    		}
    		    	}
    		    }
    		}
    		else if(user==2) {
    			System.out.println("Please choose one quote: ");
    			String islemler = "1. So  many  books  so  little  time\n" +
    		    "2. Be  the  change that  you  wish to  see  in  the  world\n" +
    			"3. No  one  can  make  you  feel  inferior  without  your  consent\n" +
    			"4. Love  for  all  hatred  for  none\n" +
    			"5. Die  with  memories  not  dreams\n" +
    			"6. Aspire  to  inspire  before  we  expire\n" + 
    			"7. Whatever  you  do  do  it  well\n" +
    			"8. What we  think  we  become\n" +
    			"9. Be so good they cant ignore you\n";
    			
    			System.out.println(islemler);
    			String islem = in.nextLine();
    						
    			switch(islem) {
    			case "1":
    				System.out.println("So many books so little time");
    			case "2":
    				System.out.println("Be  the  change that  you  wish to  see  in  the  world");
    			case "3":
    				System.out.println(" No  one  can  make  you  feel  inferior  without  your  consent");
    			case "4":
    				System.out.println(" Love  for  all  hatred  for  none");
    			case "5":
    				System.out.println("Die  with  memories  not  dreams");
    			case "6":
    				System.out.println("Aspire  to  inspire  before  we  expire");
    			case "7":
    				System.out.println("Whatever  you  do  do  it  well");
    			case "8":
    				System.out.println("What we  think  we  become");
    			case "9":
    				System.out.println(" Be so good they cant ignore you");
    			}
    			
    		}
    		else {
    			System.out.println("Please restart the game");
    		}
    	}
    
    }

