RecursiveTypeBound.java

// Using a recursive type bound to express mutual comparability - Pages 132-133
package org.effectivejava.examples.chapter05.item27;

import java.util.Arrays;
import java.util.Iterator;
import java.util.List;

public class RecursiveTypeBound {
	// Returns the maximum value in a list - uses recursive type bound
	public static <T extends Comparable<T>> T max(List<T> list) {
		Iterator<T> i = list.iterator();
		T result = i.next();
		while (i.hasNext()) {
			T t = i.next();
			if (t.compareTo(result) > 0)
				result = t;
		}
		return result;
	}

	public static void main(String[] args) {
		List<String> argList = Arrays.asList(args);
		System.out.println(max(argList));
	}
}