https://commons.apache.org/proper/commons-collections/: The Apache Commons Collections package contains types that extend and augment the Java Collections Framework. (The Apache Software Foundation)
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public class org.apache.commons.collections4.queue.SynchronizedQueue<E> extends org.apache.commons.collections4.collection.SynchronizedCollection<E> implements java.util.Queue<E>
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.apache.commons.collections4.queue.SynchronizedQueue
  super_class: org.apache.commons.collections4.collection.SynchronizedCollection
{
  private static final long serialVersionUID;
    descriptor: J
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL
    ConstantValue: 1

  public static <E> org.apache.commons.collections4.queue.SynchronizedQueue<E> synchronizedQueue(java.util.Queue<E>);
    descriptor: (Ljava/util/Queue;)Lorg/apache/commons/collections4/queue/SynchronizedQueue;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // java.util.Queue queue
         0: .line 50
            new org.apache.commons.collections4.queue.SynchronizedQueue
            dup
            aload 0 /* queue */
            invokespecial org.apache.commons.collections4.queue.SynchronizedQueue.<init>:(Ljava/util/Queue;)V
            areturn
        end local 0 // java.util.Queue queue
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    1     0  queue  Ljava/util/Queue<TE;>;
    Signature: <E:Ljava/lang/Object;>(Ljava/util/Queue<TE;>;)Lorg/apache/commons/collections4/queue/SynchronizedQueue<TE;>;
    MethodParameters:
       Name  Flags
      queue  final

  protected void <init>(java.util.Queue<E>);
    descriptor: (Ljava/util/Queue;)V
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.apache.commons.collections4.queue.SynchronizedQueue this
        start local 1 // java.util.Queue queue
         0: .line 63
            aload 0 /* this */
            aload 1 /* queue */
            invokespecial org.apache.commons.collections4.collection.SynchronizedCollection.<init>:(Ljava/util/Collection;)V
         1: .line 64
            return
        end local 1 // java.util.Queue queue
        end local 0 // org.apache.commons.collections4.queue.SynchronizedQueue this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    2     0   this  Lorg/apache/commons/collections4/queue/SynchronizedQueue<TE;>;
            0    2     1  queue  Ljava/util/Queue<TE;>;
    Signature: (Ljava/util/Queue<TE;>;)V
    MethodParameters:
       Name  Flags
      queue  final

  protected void <init>(java.util.Queue<E>, );
    descriptor: (Ljava/util/Queue;Ljava/lang/Object;)V
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=3, locals=3, args_size=3
        start local 0 // org.apache.commons.collections4.queue.SynchronizedQueue this
        start local 1 // java.util.Queue queue
        start local 2 // java.lang.Object lock
         0: .line 77
            aload 0 /* this */
            aload 1 /* queue */
            aload 2 /* lock */
            invokespecial org.apache.commons.collections4.collection.SynchronizedCollection.<init>:(Ljava/util/Collection;Ljava/lang/Object;)V
         1: .line 78
            return
        end local 2 // java.lang.Object lock
        end local 1 // java.util.Queue queue
        end local 0 // org.apache.commons.collections4.queue.SynchronizedQueue this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    2     0   this  Lorg/apache/commons/collections4/queue/SynchronizedQueue<TE;>;
            0    2     1  queue  Ljava/util/Queue<TE;>;
            0    2     2   lock  Ljava/lang/Object;
    Signature: (Ljava/util/Queue<TE;>;Ljava/lang/Object;)V
    MethodParameters:
       Name  Flags
      queue  final
      lock   final

  protected java.util.Queue<E> decorated();
    descriptor: ()Ljava/util/Queue;
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.apache.commons.collections4.queue.SynchronizedQueue this
         0: .line 87
            aload 0 /* this */
            invokespecial org.apache.commons.collections4.collection.SynchronizedCollection.decorated:()Ljava/util/Collection;
            checkcast java.util.Queue
            areturn
        end local 0 // org.apache.commons.collections4.queue.SynchronizedQueue this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/apache/commons/collections4/queue/SynchronizedQueue<TE;>;
    Signature: ()Ljava/util/Queue<TE;>;

  public E element();
    descriptor: ()Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=1
        start local 0 // org.apache.commons.collections4.queue.SynchronizedQueue this
         0: .line 92
            aload 0 /* this */
            getfield org.apache.commons.collections4.queue.SynchronizedQueue.lock:Ljava/lang/Object;
            dup
            astore 1
            monitorenter
         1: .line 93
            aload 0 /* this */
            invokevirtual org.apache.commons.collections4.queue.SynchronizedQueue.decorated:()Ljava/util/Queue;
            invokeinterface java.util.Queue.element:()Ljava/lang/Object;
            aload 1
            monitorexit
         2: areturn
         3: .line 92
      StackMap locals: org.apache.commons.collections4.queue.SynchronizedQueue java.lang.Object
      StackMap stack: java.lang.Throwable
            aload 1
            monitorexit
         4: athrow
        end local 0 // org.apache.commons.collections4.queue.SynchronizedQueue this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    5     0  this  Lorg/apache/commons/collections4/queue/SynchronizedQueue<TE;>;
      Exception table:
        from    to  target  type
           1     2       3  any
           3     4       3  any
    Signature: ()TE;

  public boolean equals(java.lang.Object);
    descriptor: (Ljava/lang/Object;)Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=3, args_size=2
        start local 0 // org.apache.commons.collections4.queue.SynchronizedQueue this
        start local 1 // java.lang.Object object
         0: .line 99
            aload 1 /* object */
            aload 0 /* this */
            if_acmpne 2
         1: .line 100
            iconst_1
            ireturn
         2: .line 102
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield org.apache.commons.collections4.queue.SynchronizedQueue.lock:Ljava/lang/Object;
            dup
            astore 2
            monitorenter
         3: .line 103
            aload 0 /* this */
            invokevirtual org.apache.commons.collections4.queue.SynchronizedQueue.decorated:()Ljava/util/Queue;
            aload 1 /* object */
            invokeinterface java.util.Queue.equals:(Ljava/lang/Object;)Z
            aload 2
            monitorexit
         4: ireturn
         5: .line 102
      StackMap locals: org.apache.commons.collections4.queue.SynchronizedQueue java.lang.Object java.lang.Object
      StackMap stack: java.lang.Throwable
            aload 2
            monitorexit
         6: athrow
        end local 1 // java.lang.Object object
        end local 0 // org.apache.commons.collections4.queue.SynchronizedQueue this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    7     0    this  Lorg/apache/commons/collections4/queue/SynchronizedQueue<TE;>;
            0    7     1  object  Ljava/lang/Object;
      Exception table:
        from    to  target  type
           3     4       5  any
           5     6       5  any
    MethodParameters:
        Name  Flags
      object  final

  public int hashCode();
    descriptor: ()I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=1
        start local 0 // org.apache.commons.collections4.queue.SynchronizedQueue this
         0: .line 111
            aload 0 /* this */
            getfield org.apache.commons.collections4.queue.SynchronizedQueue.lock:Ljava/lang/Object;
            dup
            astore 1
            monitorenter
         1: .line 112
            aload 0 /* this */
            invokevirtual org.apache.commons.collections4.queue.SynchronizedQueue.decorated:()Ljava/util/Queue;
            invokeinterface java.util.Queue.hashCode:()I
            aload 1
            monitorexit
         2: ireturn
         3: .line 111
      StackMap locals: org.apache.commons.collections4.queue.SynchronizedQueue java.lang.Object
      StackMap stack: java.lang.Throwable
            aload 1
            monitorexit
         4: athrow
        end local 0 // org.apache.commons.collections4.queue.SynchronizedQueue this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    5     0  this  Lorg/apache/commons/collections4/queue/SynchronizedQueue<TE;>;
      Exception table:
        from    to  target  type
           1     2       3  any
           3     4       3  any

  public boolean offer();
    descriptor: (Ljava/lang/Object;)Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=3, args_size=2
        start local 0 // org.apache.commons.collections4.queue.SynchronizedQueue this
        start local 1 // java.lang.Object e
         0: .line 118
            aload 0 /* this */
            getfield org.apache.commons.collections4.queue.SynchronizedQueue.lock:Ljava/lang/Object;
            dup
            astore 2
            monitorenter
         1: .line 119
            aload 0 /* this */
            invokevirtual org.apache.commons.collections4.queue.SynchronizedQueue.decorated:()Ljava/util/Queue;
            aload 1 /* e */
            invokeinterface java.util.Queue.offer:(Ljava/lang/Object;)Z
            aload 2
            monitorexit
         2: ireturn
         3: .line 118
      StackMap locals: org.apache.commons.collections4.queue.SynchronizedQueue java.lang.Object java.lang.Object
      StackMap stack: java.lang.Throwable
            aload 2
            monitorexit
         4: athrow
        end local 1 // java.lang.Object e
        end local 0 // org.apache.commons.collections4.queue.SynchronizedQueue this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    5     0  this  Lorg/apache/commons/collections4/queue/SynchronizedQueue<TE;>;
            0    5     1     e  TE;
      Exception table:
        from    to  target  type
           1     2       3  any
           3     4       3  any
    Signature: (TE;)Z
    MethodParameters:
      Name  Flags
      e     final

  public E peek();
    descriptor: ()Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=1
        start local 0 // org.apache.commons.collections4.queue.SynchronizedQueue this
         0: .line 125
            aload 0 /* this */
            getfield org.apache.commons.collections4.queue.SynchronizedQueue.lock:Ljava/lang/Object;
            dup
            astore 1
            monitorenter
         1: .line 126
            aload 0 /* this */
            invokevirtual org.apache.commons.collections4.queue.SynchronizedQueue.decorated:()Ljava/util/Queue;
            invokeinterface java.util.Queue.peek:()Ljava/lang/Object;
            aload 1
            monitorexit
         2: areturn
         3: .line 125
      StackMap locals: org.apache.commons.collections4.queue.SynchronizedQueue java.lang.Object
      StackMap stack: java.lang.Throwable
            aload 1
            monitorexit
         4: athrow
        end local 0 // org.apache.commons.collections4.queue.SynchronizedQueue this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    5     0  this  Lorg/apache/commons/collections4/queue/SynchronizedQueue<TE;>;
      Exception table:
        from    to  target  type
           1     2       3  any
           3     4       3  any
    Signature: ()TE;

  public E poll();
    descriptor: ()Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=1
        start local 0 // org.apache.commons.collections4.queue.SynchronizedQueue this
         0: .line 132
            aload 0 /* this */
            getfield org.apache.commons.collections4.queue.SynchronizedQueue.lock:Ljava/lang/Object;
            dup
            astore 1
            monitorenter
         1: .line 133
            aload 0 /* this */
            invokevirtual org.apache.commons.collections4.queue.SynchronizedQueue.decorated:()Ljava/util/Queue;
            invokeinterface java.util.Queue.poll:()Ljava/lang/Object;
            aload 1
            monitorexit
         2: areturn
         3: .line 132
      StackMap locals: org.apache.commons.collections4.queue.SynchronizedQueue java.lang.Object
      StackMap stack: java.lang.Throwable
            aload 1
            monitorexit
         4: athrow
        end local 0 // org.apache.commons.collections4.queue.SynchronizedQueue this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    5     0  this  Lorg/apache/commons/collections4/queue/SynchronizedQueue<TE;>;
      Exception table:
        from    to  target  type
           1     2       3  any
           3     4       3  any
    Signature: ()TE;

  public E remove();
    descriptor: ()Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=1
        start local 0 // org.apache.commons.collections4.queue.SynchronizedQueue this
         0: .line 139
            aload 0 /* this */
            getfield org.apache.commons.collections4.queue.SynchronizedQueue.lock:Ljava/lang/Object;
            dup
            astore 1
            monitorenter
         1: .line 140
            aload 0 /* this */
            invokevirtual org.apache.commons.collections4.queue.SynchronizedQueue.decorated:()Ljava/util/Queue;
            invokeinterface java.util.Queue.remove:()Ljava/lang/Object;
            aload 1
            monitorexit
         2: areturn
         3: .line 139
      StackMap locals: org.apache.commons.collections4.queue.SynchronizedQueue java.lang.Object
      StackMap stack: java.lang.Throwable
            aload 1
            monitorexit
         4: athrow
        end local 0 // org.apache.commons.collections4.queue.SynchronizedQueue this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    5     0  this  Lorg/apache/commons/collections4/queue/SynchronizedQueue<TE;>;
      Exception table:
        from    to  target  type
           1     2       3  any
           3     4       3  any
    Signature: ()TE;

  protected java.util.Collection decorated();
    descriptor: ()Ljava/util/Collection;
    flags: (0x1044) ACC_PROTECTED, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=1, locals=1, args_size=1
         0: .line 1
            aload 0
            invokevirtual org.apache.commons.collections4.queue.SynchronizedQueue.decorated:()Ljava/util/Queue;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
}
Signature: <E:Ljava/lang/Object;>Lorg/apache/commons/collections4/collection/SynchronizedCollection<TE;>;Ljava/util/Queue<TE;>;
SourceFile: "SynchronizedQueue.java"