Java quiz series

[Deque]

So what's the next question ? Or has the previous question been accepted as complete.

You can post a new one if you like.

[Psycho_Coder]

@Deque Sure I would love too 
 
I don't know if this question has been posted earlier or not but if it is not then here you go.


Its a common and very easy question :

Code: [Select]


public class MonkeyDLuffy {
  public static void main(String... string) {
    System.out.println("Kaizoku-oni, orewa naru!");
         //Character c = new Character('\u000d');
   }
}


Does the above code compiles ? Give proper reasons.

[red.evil]

It can't compile, because at the beginning of the compiling/parsing progress every unicode sign will be read and replaced. In this case, \u000d, it will be replaced with a newline. This leads to a source code like:

Code: [Select]

public class MonkeyDLuffy {
  public static void main(String... string) {
    System.out.println("Kaizoku-oni, orewa naru!");
         //Character c = new Character('
');
   }
}
and some of the comment is now in a new line and not a comment anymore.

If my answer is correct someone else can ask the next question.

[Psycho_Coder]

It can't compile, because at the beginning of the compiling/parsing progress every unicode sign will be read and replaced. In this case, \u000d, it will be replaced with a newline. This leads to a source code like:

Code: [Select]

public class MonkeyDLuffy {
  public static void main(String... string) {
    System.out.println("Kaizoku-oni, orewa naru!");
         //Character c = new Character('
');
   }
}
and some of the comment is now in a new line and not a comment anymore.

If my answer is correct someone else can ask the next question.

Correct!

Make the next quiz.

[sherlock]

Hey guys,
I  enjoy this kind of challenges and really would like to see them continue, so i thought it would be a nice way to introduce myself by posting one (since the last one was posted some time ago).
The challenge is probably too easy, simply explain what is happening

Code: [Select]

import java.lang.reflect.Method;

public class Main {

    private String key = "hello";
   
    public Main(){
        key = decrypt(key);
    }

    public static void main(String[] args) {
        final Main m = new Main();
        m.doStuff();
    }
   
    private String decrypt(final String s){
        final char[] c = s.toCharArray();
        for(int i = 0; i < c.length; i++){
            c[i] = (char)(c[i] - 4 - i);
        }
        return String.valueOf(c);
    }
   
    private void hello(){
        System.out.println("Hey guys!");
    }
   
    public void doStuff(){
        try {
            Method m = this.getClass().getDeclaredMethod(key);
            m.invoke(this);
        } catch (Exception e) {
            //I don't care ;)
        }
    }
   
    {{
      key = "ljrsw"; 
    }}

}