MakeSet.java

// Reflective instantiation with interface access - Page 231
package org.effectivejava.examples.chapter07.item53;

import java.util.Arrays;
import java.util.Set;

public class MakeSet {
	public static void main(String[] args) {
		// Translate the class name into a Class object
		Class<?> cl = null;
		try {
			cl = Class.forName(args[0]);
		} catch (ClassNotFoundException e) {
			System.err.println("Class not found.");
			System.exit(1);
		}

		// Instantiate the class
		Set<String> s = null;
		try {
			s = (Set<String>) cl.newInstance();
		} catch (IllegalAccessException e) {
			System.err.println("Class not accessible.");
			System.exit(1);
		} catch (InstantiationException e) {
			System.err.println("Class not instantiable.");
			System.exit(1);
		}

		// Exercise the set
		s.addAll(Arrays.asList(args).subList(1, args.length));
		System.out.println(s);
	}
}