instanceof.java

java程序设计源代码

class InstanceOf 
{
	public static void main(String[] args) 
	{
		Object [] things = new Object[3];
		things[0] = new Integer(4);
		things[1] = new Double(3.14);
		things[2] = new Double(2.09);
		double s = 0;
		for( int i=0; i<things.length; i++ ){
			if( things[i] instanceof Integer )
				s += ((Integer)things[i]).intValue();
			else if( things[i] instanceof Double )
				s += ((Double)things[i]).doubleValue();
		}
		System.out.println("sum=" + s);
	}
}