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  1. import java.util.*;
  2. import java.lang.*;
  3.  
  4. class lab3{
  5.     public static Scanner scanner = new Scanner(System.in);
  6. 	public static int selection = 0;
  7.    public static void main(String[] args){
  8.        while(true){
  9. 			selection = 0;
  10. 			display();
  11. 			scanner = new Scanner(System.in);
  12.          if(selection == 1)decode();
  13.          if(selection == 2)encode();
  14.          if(selection == 3)alphabet();
  15.          if(selection == 4)System.exit(0);
  16.          //end of if statements
  17. 		 }
  18.  
  19. }//end of main method
  20.  
  21. 	public static void display(){
  22. 		while(true){
  23. 				System.out.println("  ");
  24.            System.out.println("1. Decode a message.");
  25.            System.out.println("2. Encode a message.");
  26.            System.out.println("3. Display the alphabet.");
  27.            System.out.println("4. Exit the program.");
  28.            System.out.println("  ");
  29.            System.out.print("Please enter your selection:  ");
  30.            selection = scanner.nextInt();
  31.            System.out.println(" ");
  32.            if(selection > 4 || selection < 1){
  33.                System.out.println("please pick a proper number");
  34.                System.out.println("   ");}
  35. 			  else{
  36. 			  break;
  37. 			  }
  38.          }
  39. 	}// end of diplay
  40. 	public static void alphabet(){
  41. 		 System.out.println("A B C D E F G H I J K L M N O P Q R S T U V W X Y Z");
  42.        System.out.println("  ");
  43. 	}// end of alphabet
  44. 	public static void decode(){
  45. 						String userinputdecode = "";
  46.                   System.out.println("Enter a Phrase to decode: ");
  47.                    userinputdecode = scanner.nextLine().toUpperCase();
  48. 						 System.out.println(userinputdecode);
  49.  
  50.                    char arrUIdecode[] = userinputdecode.toCharArray();
  51.                    for(int i = 0; i < arrUIdecode.length; i++){
  52. 						 	if(arrUIdecode[i]=='A'){
  53. 							 System.out.print("Z");
  54. 							 continue;
  55. 							}
  56. 						 	if(arrUIdecode[i]==' '){
  57. 							 System.out.print(" ");
  58. 							 continue;
  59. 							}
  60. 		               System.out.print(Character.toChars(arrUIdecode[i]-1 ));
  61. 						 }
  62. 	}// end of decode
  63. 	public static void encode(){
  64. 	                   String userinputencode = "";
  65.                    ///////User input/////////
  66.                    System.out.println("Enter a Phrase to encode: ");
  67.                    userinputencode = scanner.nextLine();
  68.                    userinputencode = userinputencode.toUpperCase(); //converting to uppercase
  69.                    System.out.println(userinputencode);
  70.                    char arrUserInput[] = userinputencode.toCharArray();
  71.                    for(int i=0; i<arrUserInput.length;i++){
  72. 						 	if(arrUserInput[i]=='Z'){
  73. 							 System.out.print("A");
  74. 							 continue;
  75. 							}
  76. 							if(arrUserInput[i]==' '){
  77. 							 System.out.print(" ");
  78. 							 continue;
  79. 							}
  80.                      System.out.print(Character.toChars(arrUserInput[i]+1));
  81.   						 }
  82.                    System.out.println("  ");
  83. 	}// end of encode
  84. }//end of class
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https://ideone.com/OnPfxH
language:
Java (12.0.1)
created:
11 years ago
visibility:
public

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