public class GGTTable extends MiniJava {

    public static void main(String[] args) {
        int x = -1;
        while (x <= 0) {
            x = read("Wie groß soll die GGT-Tabelle sein? "
                    + "Bitte eine positive Zahl eingeben");
        }
        
        String line = "";
        
        // Überschriftenzeile
        int header = 1;
        while (header <= x) {
            line += "\t" + header;
            header++;
        }
        System.out.println(line); // Headerzeile abschließen
        
        // Inhalt und Zeilennummern
        int row = 1; 
        while (row <= x) {
            line = "" + row;
            
            int column = 1; 
            while (column <= x) {
                int a = row;
                int b = column;
                
                while (a != b) {
                    if (a < b)
                        b -= a;
                    else // a > b
                        a -= b;
                }

                line += "\t" + a;
                column++;
            }
            
            System.out.println(line);
            row++;
        }
    }
}