countedobject.java

来自「think in java 最新版本的源码」· Java 代码 · 共 9 行

//: generics/CountedObject.java

public class CountedObject {
  private static long counter = 0;
  private final long id = counter++;
  public long id() { return id; }
  public String toString() { return "CountedObject " + id;}
} ///:~