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copied!<p>Use Java Compiler API. <a href="http://mike-java.blogspot.com/2008/03/java-6-compiler-api-tutorial.html" rel="nofollow">Here</a> is a blog post that shows you how to do it.</p> <p>You can use temporary files for this, as this requires input/output file, or you can create custom implementation of <a href="http://docs.oracle.com/javase/6/docs/api/javax/tools/JavaFileObject.html" rel="nofollow">JavaFileObject</a> that reads source from string. From the <a href="http://docs.oracle.com/javase/6/docs/api/javax/tools/JavaCompiler.html" rel="nofollow">javadoc</a>:</p> <pre><code> /** * A file object used to represent source coming from a string. */ public class JavaSourceFromString extends SimpleJavaFileObject { /** * The source code of this "file". */ final String code; /** * Constructs a new JavaSourceFromString. * @param name the name of the compilation unit represented by this file object * @param code the source code for the compilation unit represented by this file object */ JavaSourceFromString(String name, String code) { super(URI.create("string:///" + name.replace('.','/') + Kind.SOURCE.extension), Kind.SOURCE); this.code = code; } @Override public CharSequence getCharContent(boolean ignoreEncodingErrors) { return code; } } </code></pre> <p>Once you have the output file (which is a compiled <code>.class</code> file), you can load it using <code>URLClassLoader</code> as follows:</p> <pre><code> ClassLoader loader = new URLClassLoader(new URL[] {myClassFile.toURL()); Class myClass = loader.loadClass("my.package.MyClass"); </code></pre> <p>and then instantiate it, using:</p> <pre><code> myClass.newInstance(); </code></pre> <p>or using a <code>Constructor</code>.</p>

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