https://tomcat.apache.org/: Tomcat Connectors and HTTP parser 
public class org.apache.tomcat.util.http.ConcurrentDateFormat
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.apache.tomcat.util.http.ConcurrentDateFormat
  super_class: java.lang.Object
{
  private final java.lang.String format;
    descriptor: Ljava/lang/String;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  private final java.util.Locale locale;
    descriptor: Ljava/util/Locale;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  private final java.util.TimeZone timezone;
    descriptor: Ljava/util/TimeZone;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  private final java.util.Queue<java.text.SimpleDateFormat> queue;
    descriptor: Ljava/util/Queue;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL
    Signature: Ljava/util/Queue<Ljava/text/SimpleDateFormat;>;

  public void <init>(java.lang.String, java.util.Locale, java.util.TimeZone);
    descriptor: (Ljava/lang/String;Ljava/util/Locale;Ljava/util/TimeZone;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=5, args_size=4
        start local 0 // org.apache.tomcat.util.http.ConcurrentDateFormat this
        start local 1 // java.lang.String format
        start local 2 // java.util.Locale locale
        start local 3 // java.util.TimeZone timezone
         0: .line 39
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 37
            aload 0 /* this */
            new java.util.concurrent.ConcurrentLinkedQueue
            dup
            invokespecial java.util.concurrent.ConcurrentLinkedQueue.<init>:()V
            putfield org.apache.tomcat.util.http.ConcurrentDateFormat.queue:Ljava/util/Queue;
         2: .line 40
            aload 0 /* this */
            aload 1 /* format */
            putfield org.apache.tomcat.util.http.ConcurrentDateFormat.format:Ljava/lang/String;
         3: .line 41
            aload 0 /* this */
            aload 2 /* locale */
            putfield org.apache.tomcat.util.http.ConcurrentDateFormat.locale:Ljava/util/Locale;
         4: .line 42
            aload 0 /* this */
            aload 3 /* timezone */
            putfield org.apache.tomcat.util.http.ConcurrentDateFormat.timezone:Ljava/util/TimeZone;
         5: .line 43
            aload 0 /* this */
            invokevirtual org.apache.tomcat.util.http.ConcurrentDateFormat.createInstance:()Ljava/text/SimpleDateFormat;
            astore 4 /* initial */
        start local 4 // java.text.SimpleDateFormat initial
         6: .line 44
            aload 0 /* this */
            getfield org.apache.tomcat.util.http.ConcurrentDateFormat.queue:Ljava/util/Queue;
            aload 4 /* initial */
            invokeinterface java.util.Queue.add:(Ljava/lang/Object;)Z
            pop
         7: .line 45
            return
        end local 4 // java.text.SimpleDateFormat initial
        end local 3 // java.util.TimeZone timezone
        end local 2 // java.util.Locale locale
        end local 1 // java.lang.String format
        end local 0 // org.apache.tomcat.util.http.ConcurrentDateFormat this
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0    8     0      this  Lorg/apache/tomcat/util/http/ConcurrentDateFormat;
            0    8     1    format  Ljava/lang/String;
            0    8     2    locale  Ljava/util/Locale;
            0    8     3  timezone  Ljava/util/TimeZone;
            6    8     4   initial  Ljava/text/SimpleDateFormat;
    MethodParameters:
          Name  Flags
      format    
      locale    
      timezone  

  public java.lang.String format(java.util.Date);
    descriptor: (Ljava/util/Date;)Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=4, args_size=2
        start local 0 // org.apache.tomcat.util.http.ConcurrentDateFormat this
        start local 1 // java.util.Date date
         0: .line 48
            aload 0 /* this */
            getfield org.apache.tomcat.util.http.ConcurrentDateFormat.queue:Ljava/util/Queue;
            invokeinterface java.util.Queue.poll:()Ljava/lang/Object;
            checkcast java.text.SimpleDateFormat
            astore 2 /* sdf */
        start local 2 // java.text.SimpleDateFormat sdf
         1: .line 49
            aload 2 /* sdf */
            ifnonnull 3
         2: .line 50
            aload 0 /* this */
            invokevirtual org.apache.tomcat.util.http.ConcurrentDateFormat.createInstance:()Ljava/text/SimpleDateFormat;
            astore 2 /* sdf */
         3: .line 52
      StackMap locals: java.text.SimpleDateFormat
      StackMap stack:
            aload 2 /* sdf */
            aload 1 /* date */
            invokevirtual java.text.SimpleDateFormat.format:(Ljava/util/Date;)Ljava/lang/String;
            astore 3 /* result */
        start local 3 // java.lang.String result
         4: .line 53
            aload 0 /* this */
            getfield org.apache.tomcat.util.http.ConcurrentDateFormat.queue:Ljava/util/Queue;
            aload 2 /* sdf */
            invokeinterface java.util.Queue.add:(Ljava/lang/Object;)Z
            pop
         5: .line 54
            aload 3 /* result */
            areturn
        end local 3 // java.lang.String result
        end local 2 // java.text.SimpleDateFormat sdf
        end local 1 // java.util.Date date
        end local 0 // org.apache.tomcat.util.http.ConcurrentDateFormat this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    6     0    this  Lorg/apache/tomcat/util/http/ConcurrentDateFormat;
            0    6     1    date  Ljava/util/Date;
            1    6     2     sdf  Ljava/text/SimpleDateFormat;
            4    6     3  result  Ljava/lang/String;
    MethodParameters:
      Name  Flags
      date  

  public java.util.Date parse(java.lang.String);
    descriptor: (Ljava/lang/String;)Ljava/util/Date;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=4, args_size=2
        start local 0 // org.apache.tomcat.util.http.ConcurrentDateFormat this
        start local 1 // java.lang.String source
         0: .line 58
            aload 0 /* this */
            getfield org.apache.tomcat.util.http.ConcurrentDateFormat.queue:Ljava/util/Queue;
            invokeinterface java.util.Queue.poll:()Ljava/lang/Object;
            checkcast java.text.SimpleDateFormat
            astore 2 /* sdf */
        start local 2 // java.text.SimpleDateFormat sdf
         1: .line 59
            aload 2 /* sdf */
            ifnonnull 3
         2: .line 60
            aload 0 /* this */
            invokevirtual org.apache.tomcat.util.http.ConcurrentDateFormat.createInstance:()Ljava/text/SimpleDateFormat;
            astore 2 /* sdf */
         3: .line 62
      StackMap locals: java.text.SimpleDateFormat
      StackMap stack:
            aload 2 /* sdf */
            aload 1 /* source */
            invokevirtual java.text.SimpleDateFormat.parse:(Ljava/lang/String;)Ljava/util/Date;
            astore 3 /* result */
        start local 3 // java.util.Date result
         4: .line 63
            aload 2 /* sdf */
            aload 0 /* this */
            getfield org.apache.tomcat.util.http.ConcurrentDateFormat.timezone:Ljava/util/TimeZone;
            invokevirtual java.text.SimpleDateFormat.setTimeZone:(Ljava/util/TimeZone;)V
         5: .line 64
            aload 0 /* this */
            getfield org.apache.tomcat.util.http.ConcurrentDateFormat.queue:Ljava/util/Queue;
            aload 2 /* sdf */
            invokeinterface java.util.Queue.add:(Ljava/lang/Object;)Z
            pop
         6: .line 65
            aload 3 /* result */
            areturn
        end local 3 // java.util.Date result
        end local 2 // java.text.SimpleDateFormat sdf
        end local 1 // java.lang.String source
        end local 0 // org.apache.tomcat.util.http.ConcurrentDateFormat this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    7     0    this  Lorg/apache/tomcat/util/http/ConcurrentDateFormat;
            0    7     1  source  Ljava/lang/String;
            1    7     2     sdf  Ljava/text/SimpleDateFormat;
            4    7     3  result  Ljava/util/Date;
    Exceptions:
      throws java.text.ParseException
    MethodParameters:
        Name  Flags
      source  

  private java.text.SimpleDateFormat createInstance();
    descriptor: ()Ljava/text/SimpleDateFormat;
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=4, locals=2, args_size=1
        start local 0 // org.apache.tomcat.util.http.ConcurrentDateFormat this
         0: .line 69
            new java.text.SimpleDateFormat
            dup
            aload 0 /* this */
            getfield org.apache.tomcat.util.http.ConcurrentDateFormat.format:Ljava/lang/String;
            aload 0 /* this */
            getfield org.apache.tomcat.util.http.ConcurrentDateFormat.locale:Ljava/util/Locale;
            invokespecial java.text.SimpleDateFormat.<init>:(Ljava/lang/String;Ljava/util/Locale;)V
            astore 1 /* sdf */
        start local 1 // java.text.SimpleDateFormat sdf
         1: .line 70
            aload 1 /* sdf */
            aload 0 /* this */
            getfield org.apache.tomcat.util.http.ConcurrentDateFormat.timezone:Ljava/util/TimeZone;
            invokevirtual java.text.SimpleDateFormat.setTimeZone:(Ljava/util/TimeZone;)V
         2: .line 71
            aload 1 /* sdf */
            areturn
        end local 1 // java.text.SimpleDateFormat sdf
        end local 0 // org.apache.tomcat.util.http.ConcurrentDateFormat this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lorg/apache/tomcat/util/http/ConcurrentDateFormat;
            1    3     1   sdf  Ljava/text/SimpleDateFormat;
}
SourceFile: "ConcurrentDateFormat.java"