Chaine de caractère [ Java ]

char // déclaration et initialisation en une étape
     car1 = l.charAt(0), 
     car2 = l.charAt(1),
     car3 = l.charAt(2);

     l =""+car1+car2+car3; // modification de toute la chaîne en une fois

public static String incr1(String s)
{
     byte[] tab = s.getBytes();
     
     for (int i=s.length()-1; i>=0; i--)
     {
          if (tab[i]=='Z')
               tab[i]='A';
          else
          {
               tab[i]++;
               break;
          }
     }
     
     return new String(tab);
}

//------------------------------------------------
     
private static String incr2(String s, int n)
{
     if (n==0)
          return "AA";
               
     char c = s.charAt(n);

     if (c=='Z')
          return incr2(s,n-1)+'A';
     else
          return s.substring(0,n)+(char) (c+1);
}

public static String incr2(String s)
{
     return incr2(s,s.length()-1);
}

//------------------------------------------------
     
public static void main(String args[])
{
     System.out.println(incr1("ABC")); // ABD
     System.out.println(incr1("ABZ")); // ACA
     System.out.println(incr1("ZZZ")); // AAA
     System.out.println();
     System.out.println(incr2("ABC")); // ABD
     System.out.println(incr2("ABZ")); // ACA
     System.out.println(incr2("ZZZ")); // AAAA
}

public static void main(String args[])
{
	String str = "ABCD";

	// Méthode 1 -----------------------------------

	for (int i=0; i<str.length(); i++)
		System.out.println("#1 - "+str.charAt(i));

	// Méthode 2 -----------------------------------
	
	for (char c : str.toCharArray())
		System.out.println("#2 - "+c);
	
	// Méthode 3 -----------------------------------
	
	for (byte b : str.getBytes())
		System.out.println("#3 - "+(char) b);
}

String maChaine = "ABCD"; 
for(int i = 0; i <maChaine.length(); i++) 
System.out.println("char char" + (i +1) + " = '" 
+ maChaine.charAt(i) + "';"); 

String l = "ABC";
char car1;
char car2;
char car3;
car1 = l.charAt( 0 );
car2 = l.charAt( 1 );
car3 = l.charAt( 2 );

	if( car3 == 'Z') {
		if( car2 == 'Z') {
			car1++;
			car2 = car3 = 'A';
		}
		else {
			car2++;
			car3='A';
		}
	}
	else {
		car3++;
	}
	
	l ="";
	l += car1;
	l +=  car2;
	l += car3;
	System.out.println ( l );