StringTester.java

/*******************************************************************************
 * Companion code for the book "Introduction to Software Design with Java" 
 * by Martin P. Robillard.
 *
 * Copyright (C) 2019 by Martin P. Robillard
 *
 * This code is licensed under a Creative Commons 
 * Attribution-NonCommercial-NoDerivatives 4.0 International License.
 * 
 * See http://creativecommons.org/licenses/by-nc-nd/4.0/
 *******************************************************************************/
package chapter5;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

public class StringTester
{
	/**
	 * Checks that we can call any parameterless method of class String on an
	 * empty string without raising an exception.
	 */
	public static void main(String[] args)
	{
		for( Method method : String.class.getDeclaredMethods() )
		{
			if( method.getParameterCount() == 0 )
			{
				try
				{
					method.invoke("");
				}
				catch(IllegalAccessException | IllegalArgumentException | InvocationTargetException e)
				{
					System.out.println("No, we cannot.");
					System.exit(0);
				}
			}
		}
		System.out.println("Yes, we can!");
	}
}