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    <p>You could use apache commons collection implementing a Predicate for it.</p> <p><a href="http://commons.apache.org/collections/apidocs/org/apache/commons/collections/CollectionUtils.html" rel="noreferrer">http://commons.apache.org/collections/apidocs/org/apache/commons/collections/CollectionUtils.html</a></p> <p>Sample:</p> <pre><code>package snippet; import java.util.Arrays; import java.util.Collection; import org.apache.commons.collections.CollectionUtils; import org.apache.commons.collections.Predicate; public class TestCollection { public static class User { private String name; public User(String name) { super(); this.name = name; } public String getName() { return name; } public void setName(String name) { this.name = name; } @Override public String toString() { return "User [name=" + name + "]"; } } public static void main(String[] args) { Collection&lt;User&gt; users = Arrays.asList(new User("User Name 1"), new User("User Name 2"), new User("Another User")); Predicate predicate = new Predicate() { public boolean evaluate(Object object) { return ((User) object).getName().startsWith("User"); } }; Collection filtered = CollectionUtils.select(users, predicate); System.out.println(filtered); } } </code></pre> <p>A few sample can be found here: <a href="http://apachecommonstipsandtricks.blogspot.de/2009/01/examples-of-functors-transformers.html" rel="noreferrer">http://apachecommonstipsandtricks.blogspot.de/2009/01/examples-of-functors-transformers.html</a></p> <p>And if you need something more generic, like inspect a value of a specific field or property you could do something like:</p> <pre><code>public static class MyPredicate implements Predicate { private Object expected; private String propertyName; public MyPredicate(String propertyName, Object expected) { super(); this.propertyName = propertyName; this.expected = expected; } public boolean evaluate(Object object) { try { return expected.equals(PropertyUtils.getProperty(object, propertyName)); } catch (Exception e) { return false; } } } </code></pre> <p>That could compare a specific property to a expected value, and the use would be something like:</p> <pre><code>Collection filtered = CollectionUtils.select(users, new MyPredicate("name", "User Name 2")); </code></pre>
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    1. USFrancisco Spaeth
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