https://openjdk.java.net/ 
public interface java.util.concurrent.locks.ReadWriteLock
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: java.util.concurrent.locks.ReadWriteLock
  super_class: java.lang.Object
{
  public abstract java.util.concurrent.locks.Lock readLock();
    descriptor: ()Ljava/util/concurrent/locks/Lock;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT

  public abstract java.util.concurrent.locks.Lock writeLock();
    descriptor: ()Ljava/util/concurrent/locks/Lock;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
}
SourceFile: "ReadWriteLock.java"