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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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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
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package com.sun.source.tree;

import java.util.List;

/**
 * A tree node for a lambda expression.
 *
 * For example:
 * {@code
 *   ()->{}
 *   (List ls)->ls.size()
 *   (x,y)-> { return x + y; }
 * }
 */
public interface LambdaExpressionTree extends ExpressionTree {

    /**
     * Lambda expressions come in two forms:
     * 
     *  expression lambdas, whose body is an expression, and
     * 
 statement lambdas, whose body is a block
     * 
     */
    public enum BodyKind {
        /** enum constant for expression lambdas */
        EXPRESSION,
        /** enum constant for statement lambdas */
        STATEMENT
    }

    /**
     * Returns the parameters of this lambda expression.
     * @return the parameters
     */
    List getParameters();

    /**
     * Returns the body of the lambda expression.
     * @return the body
     */
    Tree getBody();

    /**
     * Returns the kind of the body of the lambda expression.
     * @return the kind of the body
     */
    BodyKind getBodyKind();
}