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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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/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
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 * 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
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 * accompanied this code).
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package com.sun.source.tree;

/**
 * A tree node for an {@code if} statement.
 *
 * For example:
 *  *   if ( condition )
 *      thenStatement
 *
 *   if ( condition )
 *       thenStatement
 *   else
 *       elseStatement
 * 
 *
 * @jls 14.9 The if Statement
 *
 * @author Peter von der Ahé
 * @author Jonathan Gibbons
 * @since 1.6
 */
public interface IfTree extends StatementTree {
    /**
     * Returns the condition of the if-statement.
     * @return the condition
     */
    ExpressionTree getCondition();

    /**
     * Returns the statement to be executed if the condition is true
     * @return the statement to be executed if the condition is true
     */
    StatementTree getThenStatement();

    /**
     * Returns the statement to be executed if the condition is false,
     * or {@code null} if there is no such statement.
     * @return the statement to be executed if the condition is false
     */
    StatementTree getElseStatement();
}