class DiGui...{ public static void main(String args[]) ...{ DiGui.digui(4,"a"); } public static void digui(int i,String f) ...{ if(i==1) return; i=i-1; digui(i,"b"); digui(i,"c"); System.out.print(f); System.out.print(i); System.out.println(); }} 输出: b1c1b2b1c1c2a3