https://github.com/Terracotta-OSS/offheap-store/: A library that offers data structures allocated off the java heap. 
public final class org.terracotta.offheapstore.util.MemoryUnit extends java.lang.Enum<org.terracotta.offheapstore.util.MemoryUnit>
  minor version: 0
  major version: 59
  flags: flags: (0x4031) ACC_PUBLIC, ACC_FINAL, ACC_SUPER, ACC_ANNOTATION
  this_class: org.terracotta.offheapstore.util.MemoryUnit
  super_class: java.lang.Enum
{
  public static final org.terracotta.offheapstore.util.MemoryUnit BITS;
    descriptor: Lorg/terracotta/offheapstore/util/MemoryUnit;
    flags: (0x4019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL, ACC_ANNOTATION

  public static final org.terracotta.offheapstore.util.MemoryUnit NIBBLES;
    descriptor: Lorg/terracotta/offheapstore/util/MemoryUnit;
    flags: (0x4019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL, ACC_ANNOTATION

  public static final org.terracotta.offheapstore.util.MemoryUnit BYTES;
    descriptor: Lorg/terracotta/offheapstore/util/MemoryUnit;
    flags: (0x4019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL, ACC_ANNOTATION

  public static final org.terracotta.offheapstore.util.MemoryUnit KILOBYTES;
    descriptor: Lorg/terracotta/offheapstore/util/MemoryUnit;
    flags: (0x4019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL, ACC_ANNOTATION

  public static final org.terracotta.offheapstore.util.MemoryUnit MEGABYTES;
    descriptor: Lorg/terracotta/offheapstore/util/MemoryUnit;
    flags: (0x4019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL, ACC_ANNOTATION

  public static final org.terracotta.offheapstore.util.MemoryUnit GIGABYTES;
    descriptor: Lorg/terracotta/offheapstore/util/MemoryUnit;
    flags: (0x4019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL, ACC_ANNOTATION

  public static final org.terracotta.offheapstore.util.MemoryUnit TERABYTES;
    descriptor: Lorg/terracotta/offheapstore/util/MemoryUnit;
    flags: (0x4019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL, ACC_ANNOTATION

  private final int index;
    descriptor: I
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  private static final org.terracotta.offheapstore.util.MemoryUnit[] ENUM$VALUES;
    descriptor: [Lorg/terracotta/offheapstore/util/MemoryUnit;
    flags: (0x101a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL, ACC_SYNTHETIC

  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=5, locals=0, args_size=0
         0: .line 20
            new org.terracotta.offheapstore.util.MemoryUnit
            dup
            ldc "BITS"
            iconst_0
            bipush -3
            invokespecial org.terracotta.offheapstore.util.MemoryUnit.<init>:(Ljava/lang/String;II)V
            putstatic org.terracotta.offheapstore.util.MemoryUnit.BITS:Lorg/terracotta/offheapstore/util/MemoryUnit;
            new org.terracotta.offheapstore.util.MemoryUnit
            dup
            ldc "NIBBLES"
            iconst_1
            iconst_m1
            invokespecial org.terracotta.offheapstore.util.MemoryUnit.<init>:(Ljava/lang/String;II)V
            putstatic org.terracotta.offheapstore.util.MemoryUnit.NIBBLES:Lorg/terracotta/offheapstore/util/MemoryUnit;
            new org.terracotta.offheapstore.util.MemoryUnit
            dup
            ldc "BYTES"
            iconst_2
            iconst_0
            invokespecial org.terracotta.offheapstore.util.MemoryUnit.<init>:(Ljava/lang/String;II)V
            putstatic org.terracotta.offheapstore.util.MemoryUnit.BYTES:Lorg/terracotta/offheapstore/util/MemoryUnit;
            new org.terracotta.offheapstore.util.MemoryUnit
            dup
            ldc "KILOBYTES"
            iconst_3
            bipush 10
            invokespecial org.terracotta.offheapstore.util.MemoryUnit.<init>:(Ljava/lang/String;II)V
            putstatic org.terracotta.offheapstore.util.MemoryUnit.KILOBYTES:Lorg/terracotta/offheapstore/util/MemoryUnit;
            new org.terracotta.offheapstore.util.MemoryUnit
            dup
            ldc "MEGABYTES"
            iconst_4
            bipush 20
            invokespecial org.terracotta.offheapstore.util.MemoryUnit.<init>:(Ljava/lang/String;II)V
            putstatic org.terracotta.offheapstore.util.MemoryUnit.MEGABYTES:Lorg/terracotta/offheapstore/util/MemoryUnit;
            new org.terracotta.offheapstore.util.MemoryUnit
            dup
            ldc "GIGABYTES"
            iconst_5
            bipush 30
            invokespecial org.terracotta.offheapstore.util.MemoryUnit.<init>:(Ljava/lang/String;II)V
            putstatic org.terracotta.offheapstore.util.MemoryUnit.GIGABYTES:Lorg/terracotta/offheapstore/util/MemoryUnit;
            new org.terracotta.offheapstore.util.MemoryUnit
            dup
            ldc "TERABYTES"
            bipush 6
            bipush 40
            invokespecial org.terracotta.offheapstore.util.MemoryUnit.<init>:(Ljava/lang/String;II)V
            putstatic org.terracotta.offheapstore.util.MemoryUnit.TERABYTES:Lorg/terracotta/offheapstore/util/MemoryUnit;
         1: .line 18
            bipush 7
            anewarray org.terracotta.offheapstore.util.MemoryUnit
            dup
            iconst_0
            getstatic org.terracotta.offheapstore.util.MemoryUnit.BITS:Lorg/terracotta/offheapstore/util/MemoryUnit;
            aastore
            dup
            iconst_1
            getstatic org.terracotta.offheapstore.util.MemoryUnit.NIBBLES:Lorg/terracotta/offheapstore/util/MemoryUnit;
            aastore
            dup
            iconst_2
            getstatic org.terracotta.offheapstore.util.MemoryUnit.BYTES:Lorg/terracotta/offheapstore/util/MemoryUnit;
            aastore
            dup
            iconst_3
            getstatic org.terracotta.offheapstore.util.MemoryUnit.KILOBYTES:Lorg/terracotta/offheapstore/util/MemoryUnit;
            aastore
            dup
            iconst_4
            getstatic org.terracotta.offheapstore.util.MemoryUnit.MEGABYTES:Lorg/terracotta/offheapstore/util/MemoryUnit;
            aastore
            dup
            iconst_5
            getstatic org.terracotta.offheapstore.util.MemoryUnit.GIGABYTES:Lorg/terracotta/offheapstore/util/MemoryUnit;
            aastore
            dup
            bipush 6
            getstatic org.terracotta.offheapstore.util.MemoryUnit.TERABYTES:Lorg/terracotta/offheapstore/util/MemoryUnit;
            aastore
            putstatic org.terracotta.offheapstore.util.MemoryUnit.ENUM$VALUES:[Lorg/terracotta/offheapstore/util/MemoryUnit;
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  private void <init>(java.lang.String, int, int);
    descriptor: (Ljava/lang/String;II)V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=3, locals=4, args_size=4
        start local 0 // org.terracotta.offheapstore.util.MemoryUnit this
        start local 3 // int index
         0: .line 26
            aload 0 /* this */
            aload 1
            iload 2
            invokespecial java.lang.Enum.<init>:(Ljava/lang/String;I)V
         1: .line 27
            aload 0 /* this */
            iload 3 /* index */
            putfield org.terracotta.offheapstore.util.MemoryUnit.index:I
         2: .line 28
            return
        end local 3 // int index
        end local 0 // org.terracotta.offheapstore.util.MemoryUnit this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    3     0   this  Lorg/terracotta/offheapstore/util/MemoryUnit;
            0    3     3  index  I
    MethodParameters:
               Name  Flags
      $enum$name     
      $enum$ordinal  
      index          

  public long convert(long, org.terracotta.offheapstore.util.MemoryUnit);
    descriptor: (JLorg/terracotta/offheapstore/util/MemoryUnit;)J
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=4, args_size=3
        start local 0 // org.terracotta.offheapstore.util.MemoryUnit this
        start local 1 // long duration
        start local 3 // org.terracotta.offheapstore.util.MemoryUnit unit
         0: .line 31
            aload 3 /* unit */
            getfield org.terracotta.offheapstore.util.MemoryUnit.index:I
            aload 0 /* this */
            getfield org.terracotta.offheapstore.util.MemoryUnit.index:I
            isub
            lload 1 /* duration */
            invokestatic org.terracotta.offheapstore.util.MemoryUnit.doConvert:(IJ)J
            lreturn
        end local 3 // org.terracotta.offheapstore.util.MemoryUnit unit
        end local 1 // long duration
        end local 0 // org.terracotta.offheapstore.util.MemoryUnit this
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0    1     0      this  Lorg/terracotta/offheapstore/util/MemoryUnit;
            0    1     1  duration  J
            0    1     3      unit  Lorg/terracotta/offheapstore/util/MemoryUnit;
    MethodParameters:
          Name  Flags
      duration  
      unit      

  public long toBits(long);
    descriptor: (J)J
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=3, args_size=2
        start local 0 // org.terracotta.offheapstore.util.MemoryUnit this
        start local 1 // long amount
         0: .line 35
            aload 0 /* this */
            getfield org.terracotta.offheapstore.util.MemoryUnit.index:I
            getstatic org.terracotta.offheapstore.util.MemoryUnit.BITS:Lorg/terracotta/offheapstore/util/MemoryUnit;
            getfield org.terracotta.offheapstore.util.MemoryUnit.index:I
            isub
            lload 1 /* amount */
            invokestatic org.terracotta.offheapstore.util.MemoryUnit.doConvert:(IJ)J
            lreturn
        end local 1 // long amount
        end local 0 // org.terracotta.offheapstore.util.MemoryUnit this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    1     0    this  Lorg/terracotta/offheapstore/util/MemoryUnit;
            0    1     1  amount  J
    MethodParameters:
        Name  Flags
      amount  

  public int toBits(int);
    descriptor: (I)I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.terracotta.offheapstore.util.MemoryUnit this
        start local 1 // int amount
         0: .line 39
            aload 0 /* this */
            getfield org.terracotta.offheapstore.util.MemoryUnit.index:I
            getstatic org.terracotta.offheapstore.util.MemoryUnit.BITS:Lorg/terracotta/offheapstore/util/MemoryUnit;
            getfield org.terracotta.offheapstore.util.MemoryUnit.index:I
            isub
            iload 1 /* amount */
            invokestatic org.terracotta.offheapstore.util.MemoryUnit.doConvert:(II)I
            ireturn
        end local 1 // int amount
        end local 0 // org.terracotta.offheapstore.util.MemoryUnit this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    1     0    this  Lorg/terracotta/offheapstore/util/MemoryUnit;
            0    1     1  amount  I
    MethodParameters:
        Name  Flags
      amount  

  public long toBytes(long);
    descriptor: (J)J
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=3, args_size=2
        start local 0 // org.terracotta.offheapstore.util.MemoryUnit this
        start local 1 // long amount
         0: .line 43
            aload 0 /* this */
            getfield org.terracotta.offheapstore.util.MemoryUnit.index:I
            getstatic org.terracotta.offheapstore.util.MemoryUnit.BYTES:Lorg/terracotta/offheapstore/util/MemoryUnit;
            getfield org.terracotta.offheapstore.util.MemoryUnit.index:I
            isub
            lload 1 /* amount */
            invokestatic org.terracotta.offheapstore.util.MemoryUnit.doConvert:(IJ)J
            lreturn
        end local 1 // long amount
        end local 0 // org.terracotta.offheapstore.util.MemoryUnit this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    1     0    this  Lorg/terracotta/offheapstore/util/MemoryUnit;
            0    1     1  amount  J
    MethodParameters:
        Name  Flags
      amount  

  public int toBytes(int);
    descriptor: (I)I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.terracotta.offheapstore.util.MemoryUnit this
        start local 1 // int amount
         0: .line 47
            aload 0 /* this */
            getfield org.terracotta.offheapstore.util.MemoryUnit.index:I
            getstatic org.terracotta.offheapstore.util.MemoryUnit.BYTES:Lorg/terracotta/offheapstore/util/MemoryUnit;
            getfield org.terracotta.offheapstore.util.MemoryUnit.index:I
            isub
            iload 1 /* amount */
            invokestatic org.terracotta.offheapstore.util.MemoryUnit.doConvert:(II)I
            ireturn
        end local 1 // int amount
        end local 0 // org.terracotta.offheapstore.util.MemoryUnit this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    1     0    this  Lorg/terracotta/offheapstore/util/MemoryUnit;
            0    1     1  amount  I
    MethodParameters:
        Name  Flags
      amount  

  private static long doConvert(int, long);
    descriptor: (IJ)J
    flags: (0x000a) ACC_PRIVATE, ACC_STATIC
    Code:
      stack=4, locals=3, args_size=2
        start local 0 // int delta
        start local 1 // long amount
         0: .line 51
            lload 1 /* amount */
            lconst_0
            lcmp
            iflt 8
         1: .line 52
            iload 0 /* delta */
            ifne 3
         2: .line 53
            lload 1 /* amount */
            lreturn
         3: .line 54
      StackMap locals:
      StackMap stack:
            iload 0 /* delta */
            ifge 5
         4: .line 55
            lload 1 /* amount */
            iload 0 /* delta */
            ineg
            lushr
            lreturn
         5: .line 56
      StackMap locals:
      StackMap stack:
            iload 0 /* delta */
            lload 1 /* amount */
            invokestatic java.lang.Long.numberOfLeadingZeros:(J)I
            if_icmplt 7
         6: .line 57
            ldc 9223372036854775807
            lreturn
         7: .line 59
      StackMap locals:
      StackMap stack:
            lload 1 /* amount */
            iload 0 /* delta */
            lshl
            lreturn
         8: .line 62
      StackMap locals:
      StackMap stack:
            new java.lang.IllegalArgumentException
            dup
            invokespecial java.lang.IllegalArgumentException.<init>:()V
            athrow
        end local 1 // long amount
        end local 0 // int delta
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    9     0   delta  I
            0    9     1  amount  J
    MethodParameters:
        Name  Flags
      delta   
      amount  

  private static int doConvert(int, int);
    descriptor: (II)I
    flags: (0x000a) ACC_PRIVATE, ACC_STATIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // int delta
        start local 1 // int amount
         0: .line 67
            iload 1 /* amount */
            iflt 8
         1: .line 68
            iload 0 /* delta */
            ifne 3
         2: .line 69
            iload 1 /* amount */
            ireturn
         3: .line 70
      StackMap locals:
      StackMap stack:
            iload 0 /* delta */
            ifge 5
         4: .line 71
            iload 1 /* amount */
            iload 0 /* delta */
            ineg
            iushr
            ireturn
         5: .line 72
      StackMap locals:
      StackMap stack:
            iload 0 /* delta */
            iload 1 /* amount */
            invokestatic java.lang.Integer.numberOfLeadingZeros:(I)I
            if_icmplt 7
         6: .line 73
            ldc 2147483647
            ireturn
         7: .line 75
      StackMap locals:
      StackMap stack:
            iload 1 /* amount */
            iload 0 /* delta */
            ishl
            ireturn
         8: .line 78
      StackMap locals:
      StackMap stack:
            new java.lang.IllegalArgumentException
            dup
            invokespecial java.lang.IllegalArgumentException.<init>:()V
            athrow
        end local 1 // int amount
        end local 0 // int delta
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    9     0   delta  I
            0    9     1  amount  I
    MethodParameters:
        Name  Flags
      delta   
      amount  

  public static org.terracotta.offheapstore.util.MemoryUnit[] values();
    descriptor: ()[Lorg/terracotta/offheapstore/util/MemoryUnit;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=5, locals=3, args_size=0
         0: .line 1
            getstatic org.terracotta.offheapstore.util.MemoryUnit.ENUM$VALUES:[Lorg/terracotta/offheapstore/util/MemoryUnit;
            dup
            astore 0
            iconst_0
            aload 0
            arraylength
            dup
            istore 1
            anewarray org.terracotta.offheapstore.util.MemoryUnit
            dup
            astore 2
            iconst_0
            iload 1
            invokestatic java.lang.System.arraycopy:(Ljava/lang/Object;ILjava/lang/Object;II)V
            aload 2
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  public static org.terracotta.offheapstore.util.MemoryUnit valueOf(java.lang.String);
    descriptor: (Ljava/lang/String;)Lorg/terracotta/offheapstore/util/MemoryUnit;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=2, locals=1, args_size=1
         0: .line 1
            ldc Lorg/terracotta/offheapstore/util/MemoryUnit;
            aload 0
            invokestatic java.lang.Enum.valueOf:(Ljava/lang/Class;Ljava/lang/String;)Ljava/lang/Enum;
            checkcast org.terracotta.offheapstore.util.MemoryUnit
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
    MethodParameters:
      Name  Flags
      name  
}
Signature: Ljava/lang/Enum<Lorg/terracotta/offheapstore/util/MemoryUnit;>;
SourceFile: "MemoryUnit.java"