Apache Ant Source Code Files are inside the Apache Ant source package file like apache-ant-1.10.10-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 Ant 1.10.10 in \Users\fyicenter\apache-ant-1.10.10\src\main:

⏎ org/apache/tools/ant/helper/DefaultExecutor.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
 *
 *      https://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.tools.ant.helper;

import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Executor;
import org.apache.tools.ant.Project;

/**
 * Default Target executor implementation. Runs each target individually
 * (including all of its dependencies). If an error occurs, behavior is
 * determined by the Project's "keep-going" mode.
 * @since Ant 1.6.3
 */
public class DefaultExecutor implements Executor {

    private static final SingleCheckExecutor SUB_EXECUTOR = new SingleCheckExecutor();

    /** {@inheritDoc}. */
    public void executeTargets(Project project, String[] targetNames)
        throws BuildException {
        BuildException thrownException = null;
        for (String targetName : targetNames) {
            try {
                project.executeTarget(targetName);
            } catch (BuildException ex) {
                if (project.isKeepGoingMode()) {
                    thrownException = ex;
                } else {
                    throw ex;
                }
            }
        }
        if (thrownException != null) {
            throw thrownException;
        }
    }

    /** {@inheritDoc}. */
    public Executor getSubProjectExecutor() {
        return SUB_EXECUTOR;
    }

}

⏎ org/apache/tools/ant/helper/DefaultExecutor.java

Or download all of them as a single archive file:

File name: apache-ant-1.10.10-fyi.zip
File size: 2392938 bytes
Release date: 2021-04-17
Download 

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