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"nb-javac" is a patched version of OpenJDK "javac", i.e., the Java compiler. This has long been part of NetBeans, providing a highly tuned Java compiler specifically for the Java editor i.e., parsing and lexing for features such as syntax coloring, code completion.

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/*
 * Copyright (c) 2005, 2014, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
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 */

package com.sun.source.tree;

import java.util.List;
import javax.lang.model.element.Name;

/**
 * A tree node for a method or annotation type element declaration.
 *
 * For example:
 *  *   modifiers typeParameters type name
 *      ( parameters )
 *      body
 *
 *   modifiers type name () default defaultValue
 * 
 *
 * @jls 8.4 Method Declarations
 * @jls 8.6 Instance Initializers
 * @jls 8.7 Static Initializers
 * @jls 9.4 Method Declarations
 * @jls 9.6.1 Annotation Type Elements
 *
 * @author Peter von der Ahé
 * @author Jonathan Gibbons
 * @since 1.6
 */
public interface MethodTree extends Tree {
    /**
     * Returns the modifiers, including any annotations for the method being declared.
     * @return the modifiers
     */
    ModifiersTree getModifiers();

    /**
     * Returns the name of the method being declared.
     * @return the name
     */
    Name getName();

    /**
     * Returns the return type of the method being declared.
     * Returns {@code null} for a constructor.
     * @return the return type
     */
    Tree getReturnType();

    /**
     * Returns the type parameters of the method being declared.
     * @return the type parameters
     */
    List getTypeParameters();

    /**
     * Returns the parameters of the method being declared.
     * @return the parameters
     */
    List getParameters();

    /**
     * Return an explicit receiver parameter ("this" parameter),
     * or {@code null} if none.
     *
     * @return an explicit receiver parameter ("this" parameter)
     * @since 1.8
     */
    VariableTree getReceiverParameter();

    /**
     * Returns the exceptions listed as being thrown by this method.
     * @return the exceptions
     */
    List getThrows();

    /**
     * Returns the method body, or {@code null} if this is an abstract or native method.
     * @return the method body
     */
    BlockTree getBody();

    /**
     * Returns the default value, if this is an element within
     * an annotation type declaration.
     * Returns {@code null} otherwise.
     * @return the default value
     */
    Tree getDefaultValue(); // for annotation types
}