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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, 2020, 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,
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package com.sun.source.tree;

/**
 * A tree node for an {@code instanceof} expression.
 *
 * For example:
 *  *   expression instanceof type
 * 
 *
 * @jls 15.20.2 Type Comparison Operator instanceof
 *
 * @author Peter von der Ahé
 * @author Jonathan Gibbons
 * @since 1.6
 */
public interface InstanceOfTree extends ExpressionTree {
    /**
     * Returns the expression to be tested.
     * @return the expression
     */
    ExpressionTree getExpression();

    /**
     * Returns the type for which to check.
     * @return the type
     * @see #getPattern()
     */
    Tree getType();

    /**
     * Returns the tested pattern, or null if this instanceof does not use
     * a pattern.
     *
     * For instanceof with a pattern, i.e. in the following form:
     * 
     *   expression instanceof type variable name
     * 
     * returns the pattern.
     *
     * For instanceof without a pattern, i.e. in the following form:
     * 
     *   expression instanceof type
     * 
     * returns null.
     *
     * @return the tested pattern, or null if this instanceof does not use a pattern
     * @since 16
     */
    PatternTree getPattern();
}