https://www.graalvm.org/ 
public final class org.graalvm.component.installer.SystemUtils$OS extends java.lang.Enum<org.graalvm.component.installer.SystemUtils$OS>
  minor version: 0
  major version: 59
  flags: flags: (0x4031) ACC_PUBLIC, ACC_FINAL, ACC_SUPER, ACC_ANNOTATION
  this_class: org.graalvm.component.installer.SystemUtils$OS
  super_class: java.lang.Enum
{
  public static final org.graalvm.component.installer.SystemUtils$OS WINDOWS;
    descriptor: Lorg/graalvm/component/installer/SystemUtils$OS;
    flags: (0x4019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL, ACC_ANNOTATION

  public static final org.graalvm.component.installer.SystemUtils$OS LINUX;
    descriptor: Lorg/graalvm/component/installer/SystemUtils$OS;
    flags: (0x4019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL, ACC_ANNOTATION

  public static final org.graalvm.component.installer.SystemUtils$OS MAC;
    descriptor: Lorg/graalvm/component/installer/SystemUtils$OS;
    flags: (0x4019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL, ACC_ANNOTATION

  public static final org.graalvm.component.installer.SystemUtils$OS UNKNOWN;
    descriptor: Lorg/graalvm/component/installer/SystemUtils$OS;
    flags: (0x4019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL, ACC_ANNOTATION

  private static final org.graalvm.component.installer.SystemUtils$OS[] ENUM$VALUES;
    descriptor: [Lorg/graalvm/component/installer/SystemUtils$OS;
    flags: (0x101a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL, ACC_SYNTHETIC

  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=4, locals=0, args_size=0
         0: .line 76
            new org.graalvm.component.installer.SystemUtils$OS
            dup
            ldc "WINDOWS"
            iconst_0
            invokespecial org.graalvm.component.installer.SystemUtils$OS.<init>:(Ljava/lang/String;I)V
            putstatic org.graalvm.component.installer.SystemUtils$OS.WINDOWS:Lorg/graalvm/component/installer/SystemUtils$OS;
         1: .line 77
            new org.graalvm.component.installer.SystemUtils$OS
            dup
            ldc "LINUX"
            iconst_1
            invokespecial org.graalvm.component.installer.SystemUtils$OS.<init>:(Ljava/lang/String;I)V
            putstatic org.graalvm.component.installer.SystemUtils$OS.LINUX:Lorg/graalvm/component/installer/SystemUtils$OS;
         2: .line 78
            new org.graalvm.component.installer.SystemUtils$OS
            dup
            ldc "MAC"
            iconst_2
            invokespecial org.graalvm.component.installer.SystemUtils$OS.<init>:(Ljava/lang/String;I)V
            putstatic org.graalvm.component.installer.SystemUtils$OS.MAC:Lorg/graalvm/component/installer/SystemUtils$OS;
         3: .line 79
            new org.graalvm.component.installer.SystemUtils$OS
            dup
            ldc "UNKNOWN"
            iconst_3
            invokespecial org.graalvm.component.installer.SystemUtils$OS.<init>:(Ljava/lang/String;I)V
            putstatic org.graalvm.component.installer.SystemUtils$OS.UNKNOWN:Lorg/graalvm/component/installer/SystemUtils$OS;
         4: .line 75
            iconst_4
            anewarray org.graalvm.component.installer.SystemUtils$OS
            dup
            iconst_0
            getstatic org.graalvm.component.installer.SystemUtils$OS.WINDOWS:Lorg/graalvm/component/installer/SystemUtils$OS;
            aastore
            dup
            iconst_1
            getstatic org.graalvm.component.installer.SystemUtils$OS.LINUX:Lorg/graalvm/component/installer/SystemUtils$OS;
            aastore
            dup
            iconst_2
            getstatic org.graalvm.component.installer.SystemUtils$OS.MAC:Lorg/graalvm/component/installer/SystemUtils$OS;
            aastore
            dup
            iconst_3
            getstatic org.graalvm.component.installer.SystemUtils$OS.UNKNOWN:Lorg/graalvm/component/installer/SystemUtils$OS;
            aastore
            putstatic org.graalvm.component.installer.SystemUtils$OS.ENUM$VALUES:[Lorg/graalvm/component/installer/SystemUtils$OS;
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  private void <init>(java.lang.String, int);
    descriptor: (Ljava/lang/String;I)V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=3, locals=3, args_size=3
        start local 0 // org.graalvm.component.installer.SystemUtils$OS this
         0: .line 75
            aload 0 /* this */
            aload 1
            iload 2
            invokespecial java.lang.Enum.<init>:(Ljava/lang/String;I)V
            return
        end local 0 // org.graalvm.component.installer.SystemUtils$OS this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/graalvm/component/installer/SystemUtils$OS;
    MethodParameters:
               Name  Flags
      $enum$name     
      $enum$ordinal  

  public static org.graalvm.component.installer.SystemUtils$OS get();
    descriptor: ()Lorg/graalvm/component/installer/SystemUtils$OS;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=2, locals=2, args_size=0
         0: .line 85
            ldc "os.name"
            invokestatic java.lang.System.getProperty:(Ljava/lang/String;)Ljava/lang/String;
            astore 0 /* osName */
        start local 0 // java.lang.String osName
         1: .line 86
            aload 0 /* osName */
            ifnull 9
            aload 0 /* osName */
            invokevirtual java.lang.String.isEmpty:()Z
            ifne 9
         2: .line 87
            aload 0 /* osName */
            getstatic java.util.Locale.ENGLISH:Ljava/util/Locale;
            invokevirtual java.lang.String.toLowerCase:(Ljava/util/Locale;)Ljava/lang/String;
            astore 1 /* osNameLower */
        start local 1 // java.lang.String osNameLower
         3: .line 88
            aload 1 /* osNameLower */
            ldc "windows"
            invokevirtual java.lang.String.contains:(Ljava/lang/CharSequence;)Z
            ifeq 5
         4: .line 89
            getstatic org.graalvm.component.installer.SystemUtils$OS.WINDOWS:Lorg/graalvm/component/installer/SystemUtils$OS;
            areturn
         5: .line 91
      StackMap locals: java.lang.String java.lang.String
      StackMap stack:
            aload 1 /* osNameLower */
            ldc "linux"
            invokevirtual java.lang.String.contains:(Ljava/lang/CharSequence;)Z
            ifeq 7
         6: .line 92
            getstatic org.graalvm.component.installer.SystemUtils$OS.LINUX:Lorg/graalvm/component/installer/SystemUtils$OS;
            areturn
         7: .line 94
      StackMap locals:
      StackMap stack:
            aload 1 /* osNameLower */
            ldc "mac"
            invokevirtual java.lang.String.contains:(Ljava/lang/CharSequence;)Z
            ifne 8
            aload 1 /* osNameLower */
            ldc "darwin"
            invokevirtual java.lang.String.contains:(Ljava/lang/CharSequence;)Z
            ifeq 9
         8: .line 95
      StackMap locals:
      StackMap stack:
            getstatic org.graalvm.component.installer.SystemUtils$OS.MAC:Lorg/graalvm/component/installer/SystemUtils$OS;
            areturn
        end local 1 // java.lang.String osNameLower
         9: .line 98
      StackMap locals:
      StackMap stack:
            getstatic org.graalvm.component.installer.SystemUtils$OS.UNKNOWN:Lorg/graalvm/component/installer/SystemUtils$OS;
            areturn
        end local 0 // java.lang.String osName
      LocalVariableTable:
        Start  End  Slot         Name  Signature
            1   10     0       osName  Ljava/lang/String;
            3    9     1  osNameLower  Ljava/lang/String;

  public static org.graalvm.component.installer.SystemUtils$OS[] values();
    descriptor: ()[Lorg/graalvm/component/installer/SystemUtils$OS;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=5, locals=3, args_size=0
         0: .line 1
            getstatic org.graalvm.component.installer.SystemUtils$OS.ENUM$VALUES:[Lorg/graalvm/component/installer/SystemUtils$OS;
            dup
            astore 0
            iconst_0
            aload 0
            arraylength
            dup
            istore 1
            anewarray org.graalvm.component.installer.SystemUtils$OS
            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.graalvm.component.installer.SystemUtils$OS valueOf(java.lang.String);
    descriptor: (Ljava/lang/String;)Lorg/graalvm/component/installer/SystemUtils$OS;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=2, locals=1, args_size=1
         0: .line 1
            ldc Lorg/graalvm/component/installer/SystemUtils$OS;
            aload 0
            invokestatic java.lang.Enum.valueOf:(Ljava/lang/Class;Ljava/lang/String;)Ljava/lang/Enum;
            checkcast org.graalvm.component.installer.SystemUtils$OS
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
    MethodParameters:
      Name  Flags
      name  
}
Signature: Ljava/lang/Enum<Lorg/graalvm/component/installer/SystemUtils$OS;>;
SourceFile: "SystemUtils.java"
NestHost: org.graalvm.component.installer.SystemUtils
InnerClasses:
  public final OS = org.graalvm.component.installer.SystemUtils$OS of org.graalvm.component.installer.SystemUtils