http://fastutil.di.unimi.it/: fastutil extends the Java Collections Framework by providing type-specific maps, sets, lists and priority queues with a small memory footprint and fast access and insertion; provides also big (64-bit) arrays, sets and lists, and fast, practical I/O classes for binary and text files.
  • Sebastiano Vigna 
public interface it.unimi.dsi.fastutil.Stack<K>
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: it.unimi.dsi.fastutil.Stack
  super_class: java.lang.Object
{
  public abstract void push();
    descriptor: (Ljava/lang/Object;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Signature: (TK;)V
    MethodParameters:
      Name  Flags
      o     

  public abstract K pop();
    descriptor: ()Ljava/lang/Object;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Signature: ()TK;

  public abstract boolean isEmpty();
    descriptor: ()Z
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT

  public K top();
    descriptor: ()Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // it.unimi.dsi.fastutil.Stack this
         0: .line 65
            aload 0 /* this */
            iconst_0
            invokeinterface it.unimi.dsi.fastutil.Stack.peek:(I)Ljava/lang/Object;
            areturn
        end local 0 // it.unimi.dsi.fastutil.Stack this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lit/unimi/dsi/fastutil/Stack<TK;>;
    Signature: ()TK;

  public K peek();
    descriptor: (I)Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // it.unimi.dsi.fastutil.Stack this
        start local 1 // int i
         0: .line 78
            new java.lang.UnsupportedOperationException
            dup
            invokespecial java.lang.UnsupportedOperationException.<init>:()V
            athrow
        end local 1 // int i
        end local 0 // it.unimi.dsi.fastutil.Stack this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lit/unimi/dsi/fastutil/Stack<TK;>;
            0    1     1     i  I
    Signature: (I)TK;
    MethodParameters:
      Name  Flags
      i     
}
Signature: <K:Ljava/lang/Object;>Ljava/lang/Object;
SourceFile: "Stack.java"