testexception.java

关于异常的一些算法；都是很金典的例子

import com.kettas.common.*;
public class TestException{
	public static void main(String args[]){
		int a = 10;
		int b = SystemIn.readInt();
		if ( b != 0 ) System.out.println(a/b);
		//System.out.println(1.0/0); Infinity
		int n[] = new int[4];
		if ((b>=0) && (b<n.length)) System.out.println(n[b]);
		
		Animal animal = new Dog();
		if (animal instance of Cat) {
			Cat c = (Cat) animal;
		}
		if (animal != null){
			animal.eat();
		}
	}
}

class Animal{
	public void eat(){};
}

class Dog extends Animal{}
class Cat extends Animal{}