https://openjdk.java.net/ 
public interface com.sun.jdi.connect.Connector$StringArgument extends com.sun.jdi.connect.Connector$Argument
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: com.sun.jdi.connect.Connector$StringArgument
  super_class: java.lang.Object
{
  public abstract boolean isValid(java.lang.String);
    descriptor: (Ljava/lang/String;)Z
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
       Name  Flags
      value  
}
SourceFile: "Connector.java"
NestHost: com.sun.jdi.connect.Connector
InnerClasses:
  public abstract Argument = com.sun.jdi.connect.Connector$Argument of com.sun.jdi.connect.Connector
  public abstract StringArgument = com.sun.jdi.connect.Connector$StringArgument of com.sun.jdi.connect.Connector