I'm trying to make a "translator" using a HashMap that will transforom text to binary and I can't quite figure out how to replace all the characters with the value of said characters. example. Key : "a" Value : "0110 0001". This is what I have for now. P.S I'm still a beginner, so please correct me where I'm wrong. Thank you!
import java.util.Scanner;
import java.util.Map;
import java.util.HashMap;
public class Main{
public static void main(String[] args){
Scanner scan = new Scanner(System.in);
HashMap<String, String> translator = new HashMap<String, String>();
translator.put("0", "0011 0000");
translator.put("1", "0011 0001");
translator.put("2", "0011 0010");
translator.put("3", "0011 0011");
translator.put("4", "0011 0100");
translator.put("5", "0011 0101");
translator.put("6", "0011 0110");
translator.put("7", "0011 0111");
translator.put("8", "0011 1000");
translator.put("9", "0011 1001");
translator.put("A", "0100 0001");
translator.put("B", "0100 0010");
translator.put("C", "0100 0011");
translator.put("D", "0100 0100");
translator.put("E", "0100 0101");
translator.put("F", "0100 0110");
translator.put("G", "0100 0111");
translator.put("H", "0100 1000");
translator.put("I", "0100 1001");
translator.put("J", "0100 1010");
translator.put("K", "0100 1011");
translator.put("L", "0100 1100");
translator.put("M", "0100 1101");
translator.put("N", "0100 1110");
translator.put("O", "0100 1111");
translator.put("P", "0101 0000");
translator.put("Q", "0101 0001");
translator.put("R", "0101 0010");
translator.put("S", "0101 0011");
translator.put("T", "0101 0100");
translator.put("U", "0101 0101");
translator.put("V", "0101 0110");
translator.put("W", "0101 0111");
translator.put("X", "0101 1000");
translator.put("Y", "0101 1001");
translator.put("Z", "0101 1010");
translator.put("a", "0110 0001");
translator.put("b", "0110 0010");
translator.put("c", "0110 0011");
translator.put("d", "0110 0100");
translator.put("e", "0110 0101");
translator.put("f", "0110 0110");
translator.put("g", "0110 0111");
translator.put("h", "0110 1000");
translator.put("i", "0110 1001");
translator.put("j", "0110 1010");
translator.put("k", "0110 1011");
translator.put("l", "0110 1100");
translator.put("m", "0110 1101");
translator.put("n", "0110 1110");
translator.put("o", "0110 1111");
translator.put("p", "0111 0000");
translator.put("q", "0111 0001");
translator.put("r", "0111 0010");
translator.put("s", "0111 0011");
translator.put("t", "0111 0100");
translator.put("u", "0111 0101");
translator.put("v", "0111 0110");
translator.put("w", "0111 0111");
translator.put("x", "0111 1000");
translator.put("y", "0111 1001");
translator.put("z", "0111 1010");
System.out.println("Enter a phrase : ");
String txt = scan.nextLine();
String diffTxt = null;
for(int i = 0; i < txt.length(); i++){
Character tmp = txt.charAt(i);
String tmpName = tmp.toString();
for(Map.Entry<String, String> entry : translator.entrySet()){
if(tmpName.equals(entry.getKey())){
diffTxt = txt.replace(tmp.toString(), entry.getValue());
}
}
System.out.println(diffTxt);
}
}
}
Just iterate over the character array representation of your input string and use each character's string representation, as a key, to fetch corresponding value from the translator map.
System.out.println("Enter a phrase : ");
char[] txt = scan.nextLine().toCharArray(); //it's more comfortable and faster to work with char array
for(char c : txt) {
System.out.print(translator.get(String.valueOf(txt[i]))+" "); //you need a string representation of char value, as your map's key is String
}
So, the input:
Grejuc Andrei
will print:
0100 0111 0111 0010 0110 0101 0110 1010 0111 0101 0110 0011 null 0100 0001 0110 1110 0110 0100 0111 0010 0110 0101 0110 1001
Pay attention! printed text includes null, and I leave this for you to identify - why.