Enumerating Constructors

• Print the names and parameter types of all Rectangle
  constructors:
  

  Constructor[] cons = Rectangle.class.getDeclaredConstructors();
  for (Constructor c : cons) 
  { 
     Class[] params = c.getParameterTypes(); 
     System.out.print("Rectangle(");
     boolean first = true; 
     for (Class p : params) 
     { 
        if (first) first = false; else System.out.print(", "); 
        System.out.print(p.getName()); 
     } 
     System.out.println(")"); 
  } 
  

• Yields
  

  Rectangle() 
  Rectangle(java.awt.Rectangle) 
  Rectangle(int, int, int, int) 
  Rectangle(int, int) 
  Rectangle(java.awt.Point, java.awt.Dimension) 
  Rectangle(java.awt.Point) 
  Rectangle(java.awt.Dimension)