Apache BCEL Source Code Files are inside the Apache BCEL source package file like bcel-6.5.0-src.zip. Unzip the source package file and go to the "src/main" sub-directory, you will see source code files.

Here is the list of Java source code files of the Apache BCEL 6.5.0 in \Users\fyicenter\bcel-6.5.0\src:

⏎ org/apache/bcel/classfile/AnnotationDefault.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

package org.apache.bcel.classfile;

import java.io.DataInput;
import java.io.DataOutputStream;
import java.io.IOException;

import org.apache.bcel.Const;

/**
 * Represents the default value of a annotation for a method info
 *
 * @since 6.0
 */
public class AnnotationDefault extends Attribute {

    private ElementValue defaultValue;

    /**
     * @param name_index    Index pointing to the name <em>Code</em>
     * @param length        Content length in bytes
     * @param input         Input stream
     * @param constant_pool Array of constants
     */
    AnnotationDefault(final int name_index, final int length, final DataInput input, final ConstantPool constant_pool) throws IOException {
        this(name_index, length, (ElementValue) null, constant_pool);
        defaultValue = ElementValue.readElementValue(input, constant_pool);
    }

    /**
     * @param name_index    Index pointing to the name <em>Code</em>
     * @param length        Content length in bytes
     * @param defaultValue  the annotation's default value
     * @param constant_pool Array of constants
     */
    public AnnotationDefault(final int name_index, final int length, final ElementValue defaultValue, final ConstantPool constant_pool) {
        super(Const.ATTR_ANNOTATION_DEFAULT, name_index, length, constant_pool);
        this.defaultValue = defaultValue;
    }

    /**
     * Called by objects that are traversing the nodes of the tree implicitely
     * defined by the contents of a Java class. I.e., the hierarchy of methods,
     * fields, attributes, etc. spawns a tree of objects.
     *
     * @param v Visitor object
     */
    @Override
    public void accept(final Visitor v) {
        v.visitAnnotationDefault(this);
    }

    /**
     * @param defaultValue the default value of this methodinfo's annotation
     */
    public final void setDefaultValue(final ElementValue defaultValue) {
        this.defaultValue = defaultValue;
    }

    /**
     * @return the default value
     */
    public final ElementValue getDefaultValue() {
        return defaultValue;
    }

    @Override
    public Attribute copy(final ConstantPool _constant_pool) {
        return (Attribute) clone();
    }

    @Override
    public final void dump(final DataOutputStream dos) throws IOException {
        super.dump(dos);
        defaultValue.dump(dos);
    }
}

⏎ org/apache/bcel/classfile/AnnotationDefault.java

Or download all of them as a single archive file:

File name: bcel-6.5.0-fyi.zip
File size: 706792 bytes
Release date: 2020-07-03
Download 

⇒ JDK "javap" Command

⇐ Install Apache BCEL 6.5.0 Binary Package

⇑ Apache BCEL (Byte Code Engineering Library)

⇑⇑ Java Bytecode Tools