Jackson is "the Java JSON library" or "the best JSON parser for Java". Or simply as "JSON for Java".

Jackson Databind Source Code files are provided in the source packge (jackson-databind-2.14.0-sources.jar). You can download it at Jackson Maven Website.

You can also browse Jackson Databind Source Code below:

⏎ com/fasterxml/jackson/databind/ser/std/CalendarSerializer.java

package com.fasterxml.jackson.databind.ser.std;

import java.io.IOException;
import java.text.DateFormat;
import java.util.Calendar;

import com.fasterxml.jackson.core.*;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.annotation.JacksonStdImpl;

/**
 * Standard serializer for {@link java.util.Calendar}.
 * As with other time/date types, is configurable to produce timestamps
 * (standard Java 64-bit timestamp) or textual formats (usually ISO-8601).
 */
@JacksonStdImpl
@SuppressWarnings("serial")
public class CalendarSerializer
    extends DateTimeSerializerBase<Calendar>
{
    public static final CalendarSerializer instance = new CalendarSerializer();

    public CalendarSerializer() { this(null, null); }

    public CalendarSerializer(Boolean useTimestamp, DateFormat customFormat) {
        super(Calendar.class, useTimestamp, customFormat);
    }

    @Override
    public CalendarSerializer withFormat(Boolean timestamp, DateFormat customFormat) {
        return new CalendarSerializer(timestamp, customFormat);
    }

    @Override
    protected long _timestamp(Calendar value) {
        return (value == null) ? 0L : value.getTimeInMillis();
    }

    @Override
    public void serialize(Calendar value, JsonGenerator g, SerializerProvider provider) throws IOException
    {
        if (_asTimestamp(provider)) {
            g.writeNumber(_timestamp(value));
            return;
        }
        _serializeAsString(value.getTime(), g, provider);
    }
}

⏎ com/fasterxml/jackson/databind/ser/std/CalendarSerializer.java

Or download all of them as a single archive file:

File name: jackson-databind-2.14.0-sources.jar
File size: 1187952 bytes
Release date: 2022-11-05
Download 

⇒ Jackson Annotations Source Code

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⇑ Downloading and Reviewing jackson-*.jar

⇑⇑ Jackson - Java JSON library