https://github.com/eclipse/eclipse-collections/eclipse-collections: Eclipse Collections is a collections framework for Java. It has JDK-compatible List, Set and Map implementations with a rich API and set of utility classes that work with any JDK compatible Collections, Arrays, Maps or Strings. The iteration protocol was inspired by the Smalltalk collection framework.
  • Craig P. Motlin
  • Donald Raab
  • Mohammad A. Rezaei
  • Hiroshi Ito
  • Nikhil J. Nanivadekar 
public abstract class org.eclipse.collections.impl.map.mutable.primitive.AbstractSentinelValues
  minor version: 0
  major version: 59
  flags: flags: (0x0421) ACC_PUBLIC, ACC_SUPER, ACC_ABSTRACT
  this_class: org.eclipse.collections.impl.map.mutable.primitive.AbstractSentinelValues
  super_class: java.lang.Object
{
  protected boolean containsZeroKey;
    descriptor: Z
    flags: (0x0004) ACC_PROTECTED

  protected boolean containsOneKey;
    descriptor: Z
    flags: (0x0004) ACC_PROTECTED

  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.eclipse.collections.impl.map.mutable.primitive.AbstractSentinelValues this
         0: .line 13
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // org.eclipse.collections.impl.map.mutable.primitive.AbstractSentinelValues this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/map/mutable/primitive/AbstractSentinelValues;

  public int size();
    descriptor: ()I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // org.eclipse.collections.impl.map.mutable.primitive.AbstractSentinelValues this
         0: .line 20
            aload 0 /* this */
            getfield org.eclipse.collections.impl.map.mutable.primitive.AbstractSentinelValues.containsZeroKey:Z
            ifeq 1
            iconst_1
            goto 2
      StackMap locals:
      StackMap stack:
         1: iconst_0
      StackMap locals:
      StackMap stack: int
         2: aload 0 /* this */
            getfield org.eclipse.collections.impl.map.mutable.primitive.AbstractSentinelValues.containsOneKey:Z
            ifeq 3
            iconst_1
            goto 4
      StackMap locals:
      StackMap stack: int
         3: iconst_0
      StackMap locals: org.eclipse.collections.impl.map.mutable.primitive.AbstractSentinelValues
      StackMap stack: int int
         4: iadd
            ireturn
        end local 0 // org.eclipse.collections.impl.map.mutable.primitive.AbstractSentinelValues this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    5     0  this  Lorg/eclipse/collections/impl/map/mutable/primitive/AbstractSentinelValues;
}
SourceFile: "AbstractSentinelValues.java"