JDK 11 jdk.javadoc.jmod is the JMOD file for JDK 11 Java Document tool, which can be invoked by the "javadoc" command.

JDK 11 Java Document tool compiled class files are stored in \fyicenter\jdk-11.0.1\jmods\jdk.javadoc.jmod.

JDK 11 Java Document tool compiled class files are also linked and stored in the \fyicenter\jdk-11.0.1\lib\modules JImage file.

JDK 11 Java Document tool source code files are stored in \fyicenter\jdk-11.0.1\lib\src.zip\jdk.javadoc.

You can click and view the content of each source code file in the list below.

⏎ com/sun/tools/javadoc/main/ConstructorDocImpl.java

/*
 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
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 */

package com.sun.tools.javadoc.main;

import com.sun.javadoc.*;

import com.sun.source.util.TreePath;
import com.sun.tools.javac.code.Symbol.ClassSymbol;
import com.sun.tools.javac.code.Symbol.MethodSymbol;

/**
 * Represents a constructor of a java class.
 *
 *  <p><b>This is NOT part of any supported API.
 *  If you write code that depends on this, you do so at your own risk.
 *  This code and its internal interfaces are subject to change or
 *  deletion without notice.</b>
 *
 * @since 1.2
 * @author Robert Field
 * @author Neal Gafter (rewrite)
 */

@Deprecated(since="9", forRemoval=true)
@SuppressWarnings("removal")
public class ConstructorDocImpl
        extends ExecutableMemberDocImpl implements ConstructorDoc {

    /**
     * constructor.
     */
    public ConstructorDocImpl(DocEnv env, MethodSymbol sym) {
        super(env, sym);
    }

    /**
     * constructor.
     */
    public ConstructorDocImpl(DocEnv env, MethodSymbol sym, TreePath treePath) {
        super(env, sym, treePath);
    }

    /**
     * Return true if it is a constructor, which it is.
     *
     * @return true
     */
    public boolean isConstructor() {
        return true;
    }

    /**
     * Get the name.
     *
     * @return the name of the member.
     */
    public String name() {
        ClassSymbol c = sym.enclClass();
        return c.name.toString();
    }

    /**
     * Get the name.
     *
     * @return the qualified name of the member.
     */
    public String qualifiedName() {
        return sym.enclClass().getQualifiedName().toString();
    }

    /**
     * Returns a string representation of this constructor.  Includes the
     * qualified signature and any type parameters.
     * Type parameters precede the class name, as they do in the syntax
     * for invoking constructors with explicit type parameters using "new".
     * (This is unlike the syntax for invoking methods with explicit type
     * parameters.)
     */
    public String toString() {
        return typeParametersString() + qualifiedName() + signature();
    }
}

⏎ com/sun/tools/javadoc/main/ConstructorDocImpl.java

Or download all of them as a single archive file:

File name: jdk.javadoc-11.0.1-src.zip
File size: 680806 bytes
Release date: 2018-11-04
Download 

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