simulatingnull.java

来自「Thinking in JAVA第四版源代码」· Java 代码 · 共 10 行

//: annotations/SimulatingNull.java
import java.lang.annotation.*;

@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface SimulatingNull {
  public int id() default -1;
  public String description() default "";
} ///:~