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/verifier/structurals/UninitializedObjectType.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.verifier.structurals;


import org.apache.bcel.Const;
import org.apache.bcel.Constants;
import org.apache.bcel.generic.ObjectType;
import org.apache.bcel.generic.ReferenceType;

/**
 * This class represents an uninitialized object type; see The Java
 * Virtual Machine Specification, Second Edition, page 147: 4.9.4 for
 * more details.
 *
 */
public class UninitializedObjectType extends ReferenceType implements Constants {

    /** The "initialized" version. */
    private final ObjectType initialized;

    /** Creates a new instance. */
    public UninitializedObjectType(final ObjectType t) {
        super(Const.T_UNKNOWN, "<UNINITIALIZED OBJECT OF TYPE '"+t.getClassName()+"'>");
        initialized = t;
    }

    /**
     * Returns the ObjectType of the same class as the one of the uninitialized object
     * represented by this UninitializedObjectType instance.
     */
    public ObjectType getInitialized() {
        return initialized;
    }

    /** @return a hash code value for the object.
     */
    @Override
    public int hashCode() { return initialized.hashCode(); }

    /**
     * Returns true on equality of this and o.
     * Equality means the ObjectType instances of "initialized"
     * equal one another in this and the o instance.
     *
     */
    @Override
    public boolean equals(final Object o) {
        if (! (o instanceof UninitializedObjectType)) {
            return false;
        }
        return initialized.equals(((UninitializedObjectType)o).initialized);
    }
}

⏎ org/apache/bcel/verifier/structurals/UninitializedObjectType.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