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Java Java Objects (Retired) Delivering the MVP Validation

Mohammad hesam Ebrahiminejad
Mohammad hesam Ebrahiminejad
892 Points
Posted by Mohammad hesam Ebrahiminejad
Mohammad hesam Ebrahiminejad
892 Points

please can some one help me on this one

how can i check if a word has upper case?

TeacherAssistant.java 
public class TeacherAssistant {

  public static String validatedFieldName(String fieldName) {
    // These things should be verified:
    // 1.  Member fields must start with an 'm'
    // 2.  The second letter in the field name must be uppercased to ensure camel-casing
    // NOTE:  To check if something is not equal use the != symbol. eg: 3 != 4
    //for(char fieldName : fieldName.toCharArray()) {
   if ( fieldName.charAt(0) == 'm') || Character.isLowerCase(fieldName) {
   throw new IllegalArgumentException(fieldName + "its not correct"); 
   }
    return fieldName;
  }

}

2 Answers

tobiaskrause
tobiaskrause
9,160 Points
tobiaskrause
tobiaskrause
9,160 Points

This is my solution. Remember you have to check if the SECOND letter/char is Uppercase...not if all are lowercase. Also your "Character.isLowerCase(fieldName) can not even work, since you dont give isLowerCase any information about the position of the char in the String fieldName. More information: https://docs.oracle.com/javase/7/docs/api/java/lang/Character.html#isLowerCase(char) https://docs.oracle.com/javase/7/docs/api/java/lang/Character.html#isUpperCase(char)

public class TeacherAssistant {

  public static String validatedFieldName(String fieldName) {
// check if the first letter is not a lowercase 'm'
  if(fieldName.charAt(0) != 'm') {
// it is not a 'm' so we throw an exception
         throw new IllegalArgumentException() ;
// check if the second char is uppercase
  } else  if (!Character.isUpperCase(fieldName.charAt(1))) {
// if it is not ... since we used '!' ... we throw a exception
         throw new IllegalArgumentException() ;
    }
   else {
// validation complete the String passed
          return fieldName;
        }
    }
}