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    <p>Have a look at <a href="http://java.sun.com/docs/books/tutorial/reflect/member/fieldTypes.html" rel="noreferrer">Obtaining Field Types</a> from the Java Tutorial <a href="http://java.sun.com/docs/books/tutorial/reflect/" rel="noreferrer">Trail: The Reflection API</a>. </p> <p>Basically, what you need to do is to get all <a href="http://java.sun.com/javase/6/docs/api/java/lang/reflect/Field.html" rel="noreferrer"><code>java.lang.reflect.Field</code></a> of your class <strike>and call <a href="http://java.sun.com/javase/6/docs/api/java/lang/reflect/Field.html#getType%28%29" rel="noreferrer"><code>Field#getType()</code></a> on each of them</strike> (check edit below). To get <strong>all</strong> object fields including public, protected, package and private access fields, simply use <a href="http://java.sun.com/javase/6/docs/api/java/lang/Class.html#getDeclaredFields%28%29" rel="noreferrer"><code>Class.getDeclaredFields()</code></a>. Something like this:</p> <pre><code>for (Field field : Person.class.getDeclaredFields()) { System.out.format("Type: %s%n", field.getType()); System.out.format("GenericType: %s%n", field.getGenericType()); } </code></pre> <p><strong>EDIT:</strong> As pointed out by <a href="https://stackoverflow.com/users/49237/wowest">wowest</a> in a comment, you actually need to call <a href="http://java.sun.com/javase/6/docs/api/java/lang/reflect/Field.html#getGenericType%28%29" rel="noreferrer"><code>Field#getGenericType()</code></a>, check if the returned <a href="http://java.sun.com/javase/6/docs/api/java/lang/reflect/Type.html" rel="noreferrer"><code>Type</code></a> is a <code>ParameterizedType</code> and then grab the parameters accordingly. Use <a href="http://java.sun.com/javase/6/docs/api/java/lang/reflect/ParameterizedType.html#getRawType%28%29" rel="noreferrer"><code>ParameterizedType#getRawType()</code></a> and <a href="http://java.sun.com/javase/6/docs/api/java/lang/reflect/ParameterizedType.html#getActualTypeArguments%28%29" rel="noreferrer"><code>ParameterizedType#getActualTypeArgument()</code></a> to get the raw type and an array of the types argument of a <code>ParameterizedType</code> respectively. The following code demonstrates this:</p> <pre><code>for (Field field : Person.class.getDeclaredFields()) { System.out.print("Field: " + field.getName() + " - "); Type type = field.getGenericType(); if (type instanceof ParameterizedType) { ParameterizedType pType = (ParameterizedType)type; System.out.print("Raw type: " + pType.getRawType() + " - "); System.out.println("Type args: " + pType.getActualTypeArguments()[0]); } else { System.out.println("Type: " + field.getType()); } } </code></pre> <p>And would output:</p> <pre><code>Field: name - Type: class java.lang.String Field: children - Raw type: interface java.util.List - Type args: class foo.Person </code></pre>
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    1. POHow can I determine the type of a generic field in Java?
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    1. USPascal Thivent
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    1. COPascal -- you're super close. you want Type type = Field.getGenericType(); And then check if it's a ParameterizedType, then grab the parameters. This ends up being a rabbit hole -- asker needs to define limits or be prepared to write some pretty fancy code.
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    2. COThanks wowest, that is exactly what I need in conjunction with ParameterizedType.getRawType and ParameterizedType.getActualArguments.
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      1. USJuan Mendes
    3. COI can't figure out how to mark your comment as the right answer so I'll just answer my own question so I can post an example
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