src/java.base/share/classes/jdk/internal/vm/ThreadContainer.java

*** 1,7 ***
  /*
!  * Copyright (c) 2021, 2022, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
--- 1,7 ---
  /*
!  * Copyright (c) 2021, 2023, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this

*** 23,10 ***
--- 23,11 ---
   * questions.
   */
  
  package jdk.internal.vm;
  
+ import java.util.Objects;
  import java.util.stream.Stream;
  
  /**
   * A container of threads.
   */

*** 39,10 ***
--- 40,17 ---
       */
      protected ThreadContainer(boolean shared) {
          super(shared);
      }
  
+     /**
+      * Return the name of this container, may be null.
+      */
+     public String name() {
+         return null;
+     }
+ 
      /**
       * Returns the parent of this container or null if this is the root container.
       */
      public ThreadContainer parent() {
          return ThreadContainers.parent(this);

*** 92,6 ***
--- 100,17 ---
       * The scoped values captured when the thread container was created.
       */
      public ScopedValueContainer.BindingsSnapshot scopedValueBindings() {
          return null;
      }
+ 
+     @Override
+     public String toString() {
+         String name = name();
+         if (name != null && name.indexOf('@') >= 0) {
+             return name;
+         } else {
+             String id = Objects.toIdentityString(this);
+             return (name != null) ? name + "/" + id : id;
+         }
+     }
  }