throwexceptiondemo.java

java入门经典教程 java入门经典教程 java入门经典教程

// 例3.2.1 ThrowExceptionDemo.java
class ThrowException
{
	public void test(ThrowException te)
    {
		if ( te == null ) 
			throw new NullPointerException();
		else 
			System.out.println("This Object is not NULL");
    }
}
class ThrowExceptionDemo
{
	public static void main(String[] args)
    {
		ThrowException te = new ThrowException();
		ThrowException te_null = null;
        try
		{
			te.test(te);
			te.test(te_null);
		}catch(NullPointerException ne){
			System.out.print("Catch Exception: ");
			ne.printStackTrace();
		}
		System.out.println("The program is over");
    }
}