onoffswitch.java

这是一个在JAVA中比较常见的有关异常处理的程序

package chapter09;
class Switch
{
	private boolean state=false;
	boolean getState(){return state;}
	void on(){state=true;}
	void off(){state=false;}
}
class AnotherEx extends Exception{}
public class OnOffSwitch
{
	private static Switch sw=new Switch();
	public OnOffSwitch(){}
	static void dispose() throws AnotherEx
	{
		sw.off();
		throw new AnotherEx();
	}
	public static void main(String[] args) throws AnotherEx
	{
		try{
			sw.on();
		}catch(NullPointerException e){
			System.out.println("NullPointerException");
		}catch(IllegalArgumentException e){
			System.out.println("IOException");
		}finally{
			dispose();
		}
		
	}
}