Week 2: Methods, strings and lists/21. Clean up string

Write the method

String clean(String wprd)

which returns a string with "all characters except upper and lower case letters and spaces" stripped from the string given as a parameter.


Example method call:
public static void main(String[] args){
    String test = "Hel1234!&%lo";
    String cleaned = clean(test);
    System.out.println(cleaned);
}

Program outputs:
Hello





import java.util.Random;

public class Test{
    public static void main(String[] args){
        final Random r = new Random();
        
        
        String[] words = {
            "a.b.c.",
            "m1213i342x&#/¤(9985e4456d463?",
            "a1b2c3d4e5f6g7h8i9j10",
            "!he\"#re¤% &/in() t,.,-he.- m&(#)iddle*^** of&% tr&&ash& is¤ %%a% mes%#%sage"
            
        };
        for (String w : words) {
            System.out.println("Test with parameter " + w);
            System.out.println("Cleaned: " + clean(w));
            System.out.println("");
        }
        
    }
  }

    //ADD
    // public static String clean(String wprd) {
    //   String finalWord = "";
    //   for (char character: wprd) {
    //     // uppercase
    //     if (character >= 'A' && character <= 'Z') {
    //       finalWord+=character;
    //     }
    //     //lowercase
    //     else if (character >= 'a' && character <= 'z') {
    //       finalWord+=character;
    //     }
    //     //spaces
    //     else if (character == ' ') {
    //       finalWord+=character;
    //     }
    //   }
    //   return finalWord;
    // }


    //ADD
    public static String clean(String wprd) {
      String finalWord = "";
      for (int i = 0; i < wprd.length(); i++) {
        char character = wprd.charAt(i);
        // uppercase
        if (character >= 'A' && character <= 'Z') {
            finalWord += character;
        }
        // lowercase
        else if (character >= 'a' && character <= 'z') {
            finalWord += character;
        }
        // space
        else if (character == ' ') {
            finalWord += character;
        }
      }
      return finalWord;
    }







}






Test with parameter a.b.c.
Cleaned: abc

Test with parameter m1213i342x&#/¤(9985e4456d463?
Cleaned: mixed

Test with parameter a1b2c3d4e5f6g7h8i9j10
Cleaned: abcdefghij

Test with parameter !he"#re¤% &/in() t,.,-he.- m&(#)iddle*^** of&% tr&&ash& is¤ %%a% mes%#%sage
Cleaned: here in the middle of trash is a message