[Java] Erreur variable

public class Test 
{
    
	/**
	 * @param args
	 */
	
	public static void main(String[] args) 
	{   
		// TODO Auto-generated method stub
		short age = 12;
		char lettre = '!';
		String phrase = new String("Hello");
		
		System.out.println(phrase + lettre);
		System.out.print("Je m'appelle Théo et j'ai" + age + "ans !");
		

	}

}