diff --git a/src/java.base/share/classes/java/util/SimpleTimeZone.java b/src/java.base/share/classes/java/util/SimpleTimeZone.java
index 72ce744e579..5fd63db2049 100644
--- a/src/java.base/share/classes/java/util/SimpleTimeZone.java
+++ b/src/java.base/share/classes/java/util/SimpleTimeZone.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1996, 2020, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1996, 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
@@ -839,8 +839,12 @@ public class SimpleTimeZone extends TimeZone {
 
     /**
      * Queries if the given date is in daylight saving time.
+     * @implSpec The default implementation throws a
+     * {@code NullPointerException} if {@code date} is {@code null}
      * @return true if daylight saving time is in effective at the
      * given date; false otherwise.
+     * @throws NullPointerException This method may throw a
+     * {@code NullPointerException} if {@code date} is {@code null}
      */
     public boolean inDaylightTime(Date date)
     {
diff --git a/src/java.base/share/classes/java/util/TimeZone.java b/src/java.base/share/classes/java/util/TimeZone.java
index 5a1ee9e59c1..c530d33c629 100644
--- a/src/java.base/share/classes/java/util/TimeZone.java
+++ b/src/java.base/share/classes/java/util/TimeZone.java
@@ -295,7 +295,11 @@ public abstract class TimeZone implements Serializable, Cloneable {
     /**
      * Sets the time zone ID. This does not change any other data in
      * the time zone object.
+     * @implSpec The default implementation throws a
+     * {@code NullPointerException} if {@code ID} is {@code null}
      * @param ID the new time zone ID.
+     * @throws NullPointerException This method may throw a
+     * {@code NullPointerException} if {@code ID} is {@code null}
      */
     public void setID(String ID)
     {
@@ -403,13 +407,18 @@ public abstract class TimeZone implements Serializable, Cloneable {
      * found, the name is returned. Otherwise, a string in the
      * <a href="#NormalizedCustomID">normalized custom ID format</a> is returned.
      *
+     * @implSpec The default implementation throws an
+     * {@code IllegalArgumentException} if {@code style} is invalid or a
+     * {@code NullPointerException} if {@code ID} is {@code null}.
      * @param daylight {@code true} specifying a Daylight Saving Time name, or
      *                 {@code false} specifying a Standard Time name
      * @param style either {@link #LONG} or {@link #SHORT}
      * @param locale   the locale in which to supply the display name.
      * @return the human-readable name of this time zone in the given locale.
-     * @throws    IllegalArgumentException if {@code style} is invalid.
-     * @throws    NullPointerException if {@code locale} is {@code null}.
+     * @throws IllegalArgumentException This method may throw an
+     * {@code IllegalArgumentException} if {@code style} is invalid.
+     * @throws NullPointerException This method may throw a
+     * {@code NullPointerException} if {@code ID} is {@code null}
      * @since 1.2
      * @see java.text.DateFormatSymbols#getZoneStrings()
      */
@@ -519,6 +528,8 @@ public abstract class TimeZone implements Serializable, Cloneable {
      * @param date the given Date.
      * @return {@code true} if the given date is in Daylight Saving Time,
      *         {@code false}, otherwise.
+     * @throws NullPointerException This method may throw a
+     * {@code NullPointerException} if {@code date} is {@code null}
      */
     public abstract boolean inDaylightTime(Date date);
 
@@ -532,6 +543,7 @@ public abstract class TimeZone implements Serializable, Cloneable {
      *
      * @return the specified {@code TimeZone}, or the GMT zone if the given ID
      * cannot be understood.
+     * @throws NullPointerException if {@code ID} is {@code null}
      */
     public static synchronized TimeZone getTimeZone(String ID) {
         return getTimeZone(ID, true);