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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.
/*
* 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,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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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();
}