public class xyz {
  int a;
  int b;
  int c;

  //默認(rèn)的構(gòu)造器
  xyz(){
    a=10;
    b=20;
  }

  xyz(int n){
    this();
    c=n;
  }

  xyz(String s){
    this();
    System.out.println(s);
  }

  public static void main(String args[])
  {
      xyz x1=new xyz();
      xyz x2=new xyz(100);
      xyz x3=new xyz("hello");
      System.out.println(x1.a+"  "+x1.b+"  "+x1.c);
      System.out.println(x2.a+"  "+x2.b+"  "+x2.c);
      System.out.println(x3.a+"  "+x3.b+"  "+x3.c);
  }
}