https://openjdk.java.net/ 
class com.sun.xml.internal.messaging.saaj.soap.MessageImpl$MimeMatchingIterator implements java.util.Iterator<javax.xml.soap.AttachmentPart>
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: com.sun.xml.internal.messaging.saaj.soap.MessageImpl$MimeMatchingIterator
  super_class: java.lang.Object
{
  private java.util.Iterator<javax.xml.soap.AttachmentPart> iter;
    descriptor: Ljava/util/Iterator;
    flags: (0x0002) ACC_PRIVATE
    Signature: Ljava/util/Iterator<Ljavax/xml/soap/AttachmentPart;>;

  private javax.xml.soap.MimeHeaders headers;
    descriptor: Ljavax/xml/soap/MimeHeaders;
    flags: (0x0002) ACC_PRIVATE

  private javax.xml.soap.AttachmentPart nextAttachment;
    descriptor: Ljavax/xml/soap/AttachmentPart;
    flags: (0x0002) ACC_PRIVATE

  final com.sun.xml.internal.messaging.saaj.soap.MessageImpl this$0;
    descriptor: Lcom/sun/xml/internal/messaging/saaj/soap/MessageImpl;
    flags: (0x1010) ACC_FINAL, ACC_SYNTHETIC

  public void <init>(com.sun.xml.internal.messaging.saaj.soap.MessageImpl, javax.xml.soap.MimeHeaders);
    descriptor: (Lcom/sun/xml/internal/messaging/saaj/soap/MessageImpl;Ljavax/xml/soap/MimeHeaders;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=3, args_size=3
        start local 0 // com.sun.xml.internal.messaging.saaj.soap.MessageImpl$MimeMatchingIterator this
        start local 2 // javax.xml.soap.MimeHeaders headers
         0: .line 920
            aload 0 /* this */
            aload 1
            putfield com.sun.xml.internal.messaging.saaj.soap.MessageImpl$MimeMatchingIterator.this$0:Lcom/sun/xml/internal/messaging/saaj/soap/MessageImpl;
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 921
            aload 0 /* this */
            aload 2 /* headers */
            putfield com.sun.xml.internal.messaging.saaj.soap.MessageImpl$MimeMatchingIterator.headers:Ljavax/xml/soap/MimeHeaders;
         2: .line 922
            aload 0 /* this */
            aload 1
            getfield com.sun.xml.internal.messaging.saaj.soap.MessageImpl.attachments:Lcom/sun/xml/internal/messaging/saaj/util/FinalArrayList;
            invokevirtual com.sun.xml.internal.messaging.saaj.util.FinalArrayList.iterator:()Ljava/util/Iterator;
            putfield com.sun.xml.internal.messaging.saaj.soap.MessageImpl$MimeMatchingIterator.iter:Ljava/util/Iterator;
         3: .line 923
            return
        end local 2 // javax.xml.soap.MimeHeaders headers
        end local 0 // com.sun.xml.internal.messaging.saaj.soap.MessageImpl$MimeMatchingIterator this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    4     0     this  Lcom/sun/xml/internal/messaging/saaj/soap/MessageImpl$MimeMatchingIterator;
            0    4     2  headers  Ljavax/xml/soap/MimeHeaders;
    MethodParameters:
         Name  Flags
      this$0   final
      headers  

  public boolean hasNext();
    descriptor: ()Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // com.sun.xml.internal.messaging.saaj.soap.MessageImpl$MimeMatchingIterator this
         0: .line 931
            aload 0 /* this */
            getfield com.sun.xml.internal.messaging.saaj.soap.MessageImpl$MimeMatchingIterator.nextAttachment:Ljavax/xml/soap/AttachmentPart;
            ifnonnull 2
         1: .line 932
            aload 0 /* this */
            aload 0 /* this */
            invokevirtual com.sun.xml.internal.messaging.saaj.soap.MessageImpl$MimeMatchingIterator.nextMatch:()Ljavax/xml/soap/AttachmentPart;
            putfield com.sun.xml.internal.messaging.saaj.soap.MessageImpl$MimeMatchingIterator.nextAttachment:Ljavax/xml/soap/AttachmentPart;
         2: .line 933
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield com.sun.xml.internal.messaging.saaj.soap.MessageImpl$MimeMatchingIterator.nextAttachment:Ljavax/xml/soap/AttachmentPart;
            ifnull 3
            iconst_1
            ireturn
      StackMap locals:
      StackMap stack:
         3: iconst_0
            ireturn
        end local 0 // com.sun.xml.internal.messaging.saaj.soap.MessageImpl$MimeMatchingIterator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    4     0  this  Lcom/sun/xml/internal/messaging/saaj/soap/MessageImpl$MimeMatchingIterator;

  public javax.xml.soap.AttachmentPart next();
    descriptor: ()Ljavax/xml/soap/AttachmentPart;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=1
        start local 0 // com.sun.xml.internal.messaging.saaj.soap.MessageImpl$MimeMatchingIterator this
         0: .line 938
            aload 0 /* this */
            getfield com.sun.xml.internal.messaging.saaj.soap.MessageImpl$MimeMatchingIterator.nextAttachment:Ljavax/xml/soap/AttachmentPart;
            ifnull 4
         1: .line 939
            aload 0 /* this */
            getfield com.sun.xml.internal.messaging.saaj.soap.MessageImpl$MimeMatchingIterator.nextAttachment:Ljavax/xml/soap/AttachmentPart;
            astore 1 /* ret */
        start local 1 // javax.xml.soap.AttachmentPart ret
         2: .line 940
            aload 0 /* this */
            aconst_null
            putfield com.sun.xml.internal.messaging.saaj.soap.MessageImpl$MimeMatchingIterator.nextAttachment:Ljavax/xml/soap/AttachmentPart;
         3: .line 941
            aload 1 /* ret */
            areturn
        end local 1 // javax.xml.soap.AttachmentPart ret
         4: .line 944
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            invokevirtual com.sun.xml.internal.messaging.saaj.soap.MessageImpl$MimeMatchingIterator.hasNext:()Z
            ifeq 6
         5: .line 945
            aload 0 /* this */
            getfield com.sun.xml.internal.messaging.saaj.soap.MessageImpl$MimeMatchingIterator.nextAttachment:Ljavax/xml/soap/AttachmentPart;
            areturn
         6: .line 947
      StackMap locals:
      StackMap stack:
            aconst_null
            areturn
        end local 0 // com.sun.xml.internal.messaging.saaj.soap.MessageImpl$MimeMatchingIterator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    7     0  this  Lcom/sun/xml/internal/messaging/saaj/soap/MessageImpl$MimeMatchingIterator;
            2    4     1   ret  Ljavax/xml/soap/AttachmentPart;

  javax.xml.soap.AttachmentPart nextMatch();
    descriptor: ()Ljavax/xml/soap/AttachmentPart;
    flags: (0x0000) 
    Code:
      stack=2, locals=2, args_size=1
        start local 0 // com.sun.xml.internal.messaging.saaj.soap.MessageImpl$MimeMatchingIterator this
         0: .line 951
            goto 4
         1: .line 952
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield com.sun.xml.internal.messaging.saaj.soap.MessageImpl$MimeMatchingIterator.iter:Ljava/util/Iterator;
            invokeinterface java.util.Iterator.next:()Ljava/lang/Object;
            checkcast com.sun.xml.internal.messaging.saaj.soap.AttachmentPartImpl
            astore 1 /* ap */
        start local 1 // com.sun.xml.internal.messaging.saaj.soap.AttachmentPartImpl ap
         2: .line 953
            aload 1 /* ap */
            aload 0 /* this */
            getfield com.sun.xml.internal.messaging.saaj.soap.MessageImpl$MimeMatchingIterator.headers:Ljavax/xml/soap/MimeHeaders;
            invokevirtual com.sun.xml.internal.messaging.saaj.soap.AttachmentPartImpl.hasAllHeaders:(Ljavax/xml/soap/MimeHeaders;)Z
            ifeq 4
         3: .line 954
            aload 1 /* ap */
            areturn
        end local 1 // com.sun.xml.internal.messaging.saaj.soap.AttachmentPartImpl ap
         4: .line 951
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield com.sun.xml.internal.messaging.saaj.soap.MessageImpl$MimeMatchingIterator.iter:Ljava/util/Iterator;
            invokeinterface java.util.Iterator.hasNext:()Z
            ifne 1
         5: .line 956
            aconst_null
            areturn
        end local 0 // com.sun.xml.internal.messaging.saaj.soap.MessageImpl$MimeMatchingIterator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    6     0  this  Lcom/sun/xml/internal/messaging/saaj/soap/MessageImpl$MimeMatchingIterator;
            2    4     1    ap  Lcom/sun/xml/internal/messaging/saaj/soap/AttachmentPartImpl;

  public void remove();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.sun.xml.internal.messaging.saaj.soap.MessageImpl$MimeMatchingIterator this
         0: .line 961
            aload 0 /* this */
            getfield com.sun.xml.internal.messaging.saaj.soap.MessageImpl$MimeMatchingIterator.iter:Ljava/util/Iterator;
            invokeinterface java.util.Iterator.remove:()V
         1: .line 962
            return
        end local 0 // com.sun.xml.internal.messaging.saaj.soap.MessageImpl$MimeMatchingIterator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lcom/sun/xml/internal/messaging/saaj/soap/MessageImpl$MimeMatchingIterator;

  public java.lang.Object next();
    descriptor: ()Ljava/lang/Object;
    flags: (0x1041) ACC_PUBLIC, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=1, locals=1, args_size=1
         0: .line 1
            aload 0
            invokevirtual com.sun.xml.internal.messaging.saaj.soap.MessageImpl$MimeMatchingIterator.next:()Ljavax/xml/soap/AttachmentPart;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
}
Signature: Ljava/lang/Object;Ljava/util/Iterator<Ljavax/xml/soap/AttachmentPart;>;
SourceFile: "MessageImpl.java"
NestHost: com.sun.xml.internal.messaging.saaj.soap.MessageImpl
InnerClasses:
  private MimeMatchingIterator = com.sun.xml.internal.messaging.saaj.soap.MessageImpl$MimeMatchingIterator of com.sun.xml.internal.messaging.saaj.soap.MessageImpl