stormyinning29.java

java编程思想第四版习题答案

// exceptions/StormyInning29.java
// TIJ4 Chapter Exceptions, Exercise 29, page 500
/* Modify all the exception types in StormyInning.java so that they extend
* RuntimeException, and show that no exception specifications or try blocks
* are necessary. Remove the '//!' comments and show how the methods can be
* compiled without specifications.
*/

class BaseballException extends RuntimeException {}
class Foul extends RuntimeException {}
class Strike extends RuntimeException {}

abstract class Inning {
	public Inning() {}
	public void event() {}
	public abstract void atBat();
	public void walk() {}
}

class StormException extends RuntimeException {}
class RainedOut extends RuntimeException {}
class PopFoul extends RuntimeException {}

interface Storm {
	public void event();
	public void rainHard();
}

public class StormyInning29 extends Inning implements Storm {
	public StormyInning29() {}
	public StormyInning29(String s) {}
	public void walk() {}
	public void event() {}
	public void rainHard() {}
	public void atBat() {}
	public static void main(String[] args) {
		StormyInning29 si = new StormyInning29();
		si.atBat();
		// What happens if you upcast?
		Inning i = new StormyInning29();
		i.atBat();
	}
}