Thread: Beginner Problem

Hello, I tried some exercises: Entering a first and a lastname, the return should be the last name in uppercase.
Example:
input: John Doe
output: John DOE

unfortunately i get a "null null", where is my mistake??

import java.util.Scanner;
 
public class A3 {
 
	static String inData;
	static String firstname;
	static String lastname;
 
	public static void main(String[] args){
 
		Scanner scan = new Scanner(System.in);
		inData=scan.next();
		for(int index=0; index<inData.length(); index++){
			if(inData.charAt(index) == ' ')
			{
				firstname=inData.substring(0, index-1);
				lastname=inData.substring(index+1, inData.length());
				lastname=lastname.toUpperCase();
			}
 
			else {
			}
 
			}
		System.out.println(firstname + " " + lastname);
		}
	}

Add some more printlns to show what the code is doing and what values you are working with.
For example print out the value of inData immediately after it is read in:
System.out.println("inData=" + inData + "<");

How many lines does your program print out? Can you copy and paste here the full contents of the screen from you test.
To copy the contents of the command prompt window:
Click on Icon in upper left corner
Select Edit
Select 'Select All' - The selection will show
Click in upper left again
Select Edit and click 'Copy'

Paste here.

I found the error: I had to use scan.nextLine(); instead of scan.next();
No it works, thanks for your reply.

Yes those methods will return different data. Which one to use depends on your application.