collections example

gistfile1.java

package com.redowl.prototype;

import static org.junit.Assert.*;

import java.util.Collection;
import java.util.List;

import org.junit.Test;

import com.google.common.base.Predicate;
import com.google.common.collect.Collections2;
import com.google.common.collect.Lists;

public class GuavaWalkthrough {

	@Test
	public void test() {
		// generics on the left hand side only, cool!
		Collection<Integer> numbers = Lists.newArrayList();
		for (int i = 0; i < 10; i++) {
			numbers.add(i);
		}
		Collection<Integer> filteredNumbers = Collections2.filter(numbers, new IsEven());
		System.out.println(filteredNumbers);
	}	
	public class IsEven implements Predicate<Integer> {
		@Override
		public boolean apply(Integer compare) {
			return compare % 2 == 0;
		}
	}	
}