java中关键字public[Java编程]

//: Cookie.java
// Creates a library
package c05.dessert;

public class Cookie {
  public Cookie() { 
   System.out.println("Cookie constructor"); 
  }
  void foo() { System.out.println("foo"); }
} ///:~

//: Dinner.java
// Uses the library
import c05.dessert.*;

public class Dinner {
  public Dinner() {
   System.out.println("Dinner constructor");
  }
  public static void main(String[] args) {
    Cookie x = new Cookie();
    //! x.foo(); // Can't access
  }
} ///:~

//: Cake.java
// Accesses a class in a separate 
// compilation unit.

class Cake {
  public static void main(String[] args) {
    Pie x = new Pie();
    x.f();
  }
} ///:~

//: Pie.java
// The other class

class Pie {
  void f() { System.out.println("Pie.f()"); }
} ///:~