8343804: Show the default time zone with -XshowSettings option

Reviewed-by: iris, jpai

Author: naotoj

src/java.base/share/classes/sun/launcher/LauncherHelper.java

@@ -63,6 +63,7 @@
 import java.util.Properties;
 import java.util.ResourceBundle;
 import java.util.Set;
+import java.util.TimeZone;
 import java.util.TreeSet;
 import java.util.function.Function;
 import java.util.jar.Attributes;
@@ -318,6 +319,8 @@ private static void printLocale(boolean verbose) {
                 Locale.getDefault(Category.DISPLAY).getDisplayName());
         ostream.println(INDENT + "default format locale = " +
                 Locale.getDefault(Category.FORMAT).getDisplayName());
+        ostream.println(INDENT + "default timezone = " +
+                TimeZone.getDefault().getID());
         ostream.println(INDENT + "tzdata version = " +
                 ZoneInfoFile.getVersion());
         if (verbose) {

test/jdk/tools/launcher/Settings.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2010, 2023, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2010, 2024, 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
@@ -25,7 +25,7 @@
 
 /*
  * @test
- * @bug 6994753 7123582 8305950 8281658 8310201 8311653
+ * @bug 6994753 7123582 8305950 8281658 8310201 8311653 8343804
  * @summary tests -XshowSettings options
  * @modules jdk.compiler
  *          jdk.zipfs
@@ -80,6 +80,7 @@ static void checkNotContains(TestResult tr, String str) {
     private static final String SYSTEM_SETTINGS = "Operating System Metrics:";
     private static final String METRICS_NOT_AVAILABLE_MSG = "No metrics available for this platform";
     private static final String STACKSIZE_SETTINGS = "Stack Size:";
+    private static final String TIMEZONE_SETTINGS = "default timezone";
     private static final String TZDATA_SETTINGS = "tzdata version";
     private static final String ERR_MSG = "Unrecognized showSettings option:";
 
@@ -96,6 +97,7 @@ static void containsAllOptions(TestResult tr) {
         checkNotContains(tr, SEC_SUMMARY_PROPS_SETTINGS);
         checkContains(tr, SEC_PROVIDER_SETTINGS);
         checkContains(tr, SEC_TLS_SETTINGS);
+        checkContains(tr, TIMEZONE_SETTINGS);
         checkContains(tr, TZDATA_SETTINGS);
         if (System.getProperty("os.name").contains("Linux")) {
             checkContains(tr, SYSTEM_SETTINGS);
@@ -119,6 +121,7 @@ static void containsDefaultOptions(TestResult tr) {
         checkContains(tr, SEC_SUMMARY_PROPS_SETTINGS);
         checkContains(tr, SEC_PROVIDER_SETTINGS);
         checkContains(tr, SEC_TLS_SETTINGS);
+        checkContains(tr, TIMEZONE_SETTINGS);
         checkContains(tr, TZDATA_SETTINGS);
         if (System.getProperty("os.name").contains("Linux")) {
             checkContains(tr, SYSTEM_SETTINGS);
@@ -190,6 +193,7 @@ static void runTestOptionLocale() throws IOException {
         checkContains(tr, LOCALE_SETTINGS);
         checkContains(tr, AVAILABLE_LOCALES);
         checkNotContains(tr, LOCALE_SUMMARY_SETTINGS);
+        checkContains(tr, TIMEZONE_SETTINGS);
         checkContains(tr, TZDATA_SETTINGS);
     }