Apache BCEL Source Code Files are inside the Apache BCEL source package file like bcel-6.6.1-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 6.6.1 in \Users\fyicenter\bcel-6.6.1\src:

⏎ org/apache/bcel/classfile/EnumElementValue.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.DataOutputStream;
import java.io.IOException;

/**
 * @since 6.0
 */
public class EnumElementValue extends ElementValue {
    // For enum types, these two indices point to the type and value
    private final int typeIdx;

    private final int valueIdx;

    public EnumElementValue(final int type, final int typeIdx, final int valueIdx, final ConstantPool cpool) {
        super(type, cpool);
        if (type != ENUM_CONSTANT) {
            throw new IllegalArgumentException("Only element values of type enum can be built with this ctor - type specified: " + type);
        }
        this.typeIdx = typeIdx;
        this.valueIdx = valueIdx;
    }

    @Override
    public void dump(final DataOutputStream dos) throws IOException {
        dos.writeByte(super.getType()); // u1 type of value (ENUM_CONSTANT == 'e')
        dos.writeShort(typeIdx); // u2
        dos.writeShort(valueIdx); // u2
    }

    public String getEnumTypeString() {
        return super.getConstantPool().getConstantUtf8(typeIdx).getBytes();
    }

    public String getEnumValueString() {
        return super.getConstantPool().getConstantUtf8(valueIdx).getBytes();
    }

    public int getTypeIndex() {
        return typeIdx;
    }

    public int getValueIndex() {
        return valueIdx;
    }

    @Override
    public String stringifyValue() {
        return super.getConstantPool().getConstantUtf8(valueIdx).getBytes();
    }
}

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

Or download all of them as a single archive file:

File name: bcel-6.6.1-sources.jar
File size: 688374 bytes
Release date: 2022-09-18
Download 

⇒ Install Apache BCEL 6.5.0 Binary Package

⇐ Download and Install Apache BCEL Source Package

⇑ Apache BCEL (Byte Code Engineering Library)

⇑⇑ Java Bytecode Tools