parcel3.java

来自「Java编程思想 第八课 全源码」· Java 代码 · 共 36 行

//: c08:Parcel3.java
// From 'Thinking in Java, 2nd ed.' by Bruce Eckel
// www.BruceEckel.com. See copyright notice in CopyRight.txt.
// Returning a reference to an inner class.

public class Parcel3 {
  private class PContents implements Contents {
    private int i = 11;
    public int value() { return i; }
  }
  protected class PDestination
      implements Destination {
    private String label;
    private PDestination(String whereTo) {
      label = whereTo;
    }
    public String readLabel() { return label; }
  }
  public Destination dest(String s) {
    return new PDestination(s);
  }
  public Contents cont() { 
    return new PContents(); 
  }
}

class Test {
  public static void main(String[] args) {
    Parcel3 p = new Parcel3();
    Contents c = p.cont();
    Destination d = p.dest("Tanzania");
    System.out.println(d.readLabel()+" " + c.value());
    // Illegal -- can't access private class:
    //! Parcel3.PContents pc = p.new PContents();
  }
} ///:~