onoffswitch14.java

java编程思想第四版习题答案

// exceptions/OnOffSwitch14.java
// TIJ4 Chapter Exceptions, Exercise 14, page 476
// Show that the OnOffSwitch.java can fail by throwing a
// RuntimeException inside the try block.

public class OnOffSwitch14 {
	private static Switch sw = new Switch();
	static Integer[] x = new Integer[1];
	public static void f(int i)
	throws OnOffException1, OnOffException2 {}
	public static void main(String[] args) {
		try {
			sw.on();
			// Code that can throw RuntimeException
			// and leave Switch on:
			f(x[0]);
			sw.off();
		} catch(OnOffException1 e) {
			System.out.println("OnOffException1");
			sw.off();
		} catch(OnOffException2 e) {
			System.out.println("OnOffException2");
			sw.off();
		}
	}
}