ChangeCase.java

[RobinsionOrange]

Im trying to create a script that reverses the case of all characters of an argument from the command line:

This is what i got:

public class ChangeCase {
 
  public static void main (String args[])  {
 
        String tempString;
        char tempCharacter;
        char tempCharUp;
        char tempCharDown;
 
        for (int i=0 ; i < args.length ; i++){
        tempString = args[i];
        tempCharacter = tempString.charAt(i);
        tempCharUp = tempCharacter.toUpperCase();
        tempCharDown = tempCharacter.toLowerCase();
                if (tempCharacter.equals(tempCharUp)){
                        tempCharacter = tempCharDown;
                        System.out.println (tempCharacter);
}
                else {
                        tempCharacter = tempCharUp;
                        System.out.println (tempCharacter);
                     }
                }
         }
}
 

But im getting this:
ChangeCase.java:15: char cannot be dereferenced
tempCharUp = tempCharacter.toUpperCase();
^
ChangeCase.java:16: char cannot be dereferenced
tempCharDown = tempCharacter.toLowerCase();
^
ChangeCase.java:17: char cannot be dereferenced
if (tempCharacter.equals(tempCharUp)){
^
3 errors

Any sugestions please, im quite new to java.

Regards in advance.

[sandyw]

Question what does char mean to you.

sandyw

[RobinsionOrange]

Character?

[sandyw]

You might be using char for the wrong reason.
Review what char mean...

or I might be wrong...
sandyw

[JosAH]

A char is a primitive and it hasn't any methods; that's what your compiler is
whining about. Have a look at the Character class and its many utility
methods. Hint: pay special attention to the methods isLowerCase, isUpperCase,
toLowerCase and toUppercase.

kind regards,

Jos

[r035198x]

Im trying to create a script that reverses the case of all characters of an argument from the command line:

This is what i got:

public class ChangeCase {
 
public static void main (String args[]) {
 
String tempString;
char tempCharacter;
char tempCharUp;
char tempCharDown;
 
for (int i=0 ; i < args.length ; i++){
tempString = args[i];
tempCharacter = tempString.charAt(i);
tempCharUp = tempCharacter.toUpperCase();
tempCharDown = tempCharacter.toLowerCase();
if (tempCharacter.equals(tempCharUp)){
tempCharacter = tempCharDown;
System.out.println (tempCharacter);
}
else {
tempCharacter = tempCharUp;
System.out.println (tempCharacter);
}
}
}
}
 

But im getting this:
ChangeCase.java:15: char cannot be dereferenced
tempCharUp = tempCharacter.toUpperCase();
^
ChangeCase.java:16: char cannot be dereferenced
tempCharDown = tempCharacter.toLowerCase();
^
ChangeCase.java:17: char cannot be dereferenced
if (tempCharacter.equals(tempCharUp)){
^
3 errors

Any sugestions please, im quite new to java.

Regards in advance.

tempCharacter.toUpperCase(); is not allowed. Look at API specs for the Character class to see how to convert characters.

[r035198x]

A char is a primitive and it hasn't any methods; that's what your compiler is
whining about. Have a look at the Character class and its many utility
methods. Hint: pay special attention to the methods isLowerCase, isUpperCase,
toLowerCase and toUppercase.

kind regards,

Jos

Hey I thought my connection was faster than Jos' connection ...

[JosAH]

Hey I thought my connection was faster than Jos' connection ...

I already had my espresso so I'm amazingly fast this morning ;-)

kind regards,

Jos