waveform.java

来自「《Java编程思想》第四版源代码」· Java 代码 · 共 9 行

//: interfaces/filters/Waveform.java
package interfaces.filters;

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