fullconstructors.java

thinking in java 书中源码 第四版

//: exceptions/FullConstructors.java

class MyException extends Exception {
  public MyException() {}
  public MyException(String msg) { super(msg); }
}

public class FullConstructors {
  public static void f() throws MyException {
    System.out.println("Throwing MyException from f()");
    throw new MyException();
  }
  public static void g() throws MyException {
    System.out.println("Throwing MyException from g()");
    throw new MyException("Originated in g()");
  }
  public static void main(String[] args) {
    try {
      f();
    } catch(MyException e) {
      e.printStackTrace(System.out);
    }
    try {
      g();
    } catch(MyException e) {
      e.printStackTrace(System.out);
    }
  }
} /* Output:
Throwing MyException from f()
MyException
        at FullConstructors.f(FullConstructors.java:11)
        at FullConstructors.main(FullConstructors.java:19)
Throwing MyException from g()
MyException: Originated in g()
        at FullConstructors.g(FullConstructors.java:15)
        at FullConstructors.main(FullConstructors.java:24)
*///:~