http://picocli.info: Java command line parser with both an annotations API and a programmatic API. Usage help with ANSI styles and colors. Autocomplete. Nested subcommands. Easily included as source to avoid adding a dependency.
  • Remko Popma 
class picocli.CommandLine$Model$Interpolator$1 implements picocli.CommandLine$Model$Interpolator$ILookup
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: picocli.CommandLine$Model$Interpolator$1
  super_class: java.lang.Object
{
  final picocli.CommandLine$Model$Interpolator this$2;
    descriptor: Lpicocli/CommandLine$Model$Interpolator;
    flags: (0x1010) ACC_FINAL, ACC_SYNTHETIC

  void <init>(picocli.CommandLine$Model$Interpolator);
    descriptor: (Lpicocli/CommandLine$Model$Interpolator;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // picocli.CommandLine$Model$Interpolator$1 this
         0: .line 10325
            aload 0 /* this */
            aload 1
            putfield picocli.CommandLine$Model$Interpolator$1.this$2:Lpicocli/CommandLine$Model$Interpolator;
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // picocli.CommandLine$Model$Interpolator$1 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lpicocli/CommandLine$Model$Interpolator$1;
    MethodParameters:
        Name  Flags
      this$0  final

  public java.lang.String get(java.lang.String);
    descriptor: (Ljava/lang/String;)Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=2, args_size=2
        start local 0 // picocli.CommandLine$Model$Interpolator$1 this
        start local 1 // java.lang.String key
         0: .line 10325
            aload 1 /* key */
            invokestatic java.lang.System.getProperty:(Ljava/lang/String;)Ljava/lang/String;
            areturn
        end local 1 // java.lang.String key
        end local 0 // picocli.CommandLine$Model$Interpolator$1 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lpicocli/CommandLine$Model$Interpolator$1;
            0    1     1   key  Ljava/lang/String;
    MethodParameters:
      Name  Flags
      key   
}
SourceFile: "CommandLine.java"
EnclosingMethod: picocli.CommandLine$Model$Interpolator.<init>:(Lpicocli/CommandLine$Model$CommandSpec;)V
NestHost: picocli.CommandLine
InnerClasses:
  public final Model = picocli.CommandLine$Model of picocli.CommandLine
  public CommandSpec = picocli.CommandLine$Model$CommandSpec of picocli.CommandLine$Model
  Interpolator = picocli.CommandLine$Model$Interpolator of picocli.CommandLine$Model
  picocli.CommandLine$Model$Interpolator$1
  abstract ILookup = picocli.CommandLine$Model$Interpolator$ILookup of picocli.CommandLine$Model$Interpolator