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8360575: java.util.Properties.list() methods trim each value to 37 characters in the listed output #26018

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8360575: java.util.Properties.list() methods trim each value to 37 characters in the listed output #26018

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8360575: java.util.Properties.list() methods trim each value to 37 ch…
jaikiran Jun 27, 2025
d276ad0
Alan's review - limit the details in implNote
jaikiran Jun 27, 2025
049e43e
Andy's review suggestions
jaikiran Jun 27, 2025
df9c7ca
Alan's review - no need to state the number of characters
jaikiran Jun 30, 2025
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34 changes: 29 additions & 5 deletions src/java.base/share/classes/java/util/Properties.java
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
/*
* Copyright (c) 1995, 2024, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 1995, 2025, 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
Expand Down Expand Up @@ -1211,10 +1211,22 @@ public Set<String> stringPropertyNames() {
}

/**
* Prints this property list out to the specified output stream.
* Prints this property list out to the specified {@link PrintStream}.
* This method is useful for debugging.
*
* @param out an output stream.
* @implNote The implementation of this method truncates the output for very long
* property values.
* <p>
* An alternative for listing the {@code Properties} to a {@code PrintStream}
* without truncation is:
* {@snippet lang=java :
* Properties p = ...
* PrintStream out = ...
* // list the properties to PrintStream
* p.forEach((k, v) -> out.println(k + "=" + v));
* }
*
* @param out the output PrintStream
* @throws ClassCastException if any key in this property list
* is not a string.
*/
Expand All @@ -1233,10 +1245,22 @@ public void list(PrintStream out) {
}

/**
* Prints this property list out to the specified output stream.
* Prints this property list out to the specified {@link PrintWriter}.
* This method is useful for debugging.
*
* @param out an output stream.
* @implNote The implementation of this method truncates the output for very long
* property values.
* <p>
* An alternative for listing the {@code Properties} to a {@code PrintWriter}
* without truncation is:
* {@snippet lang=java :
* Properties p = ...
* PrintWriter out = ...
* // list the properties to PrintWriter
* p.forEach((k, v) -> out.println(k + "=" + v));
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Should our example recommend using toString as a utility to obtain a debug string instead, as it performs no truncation?

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Using toString() will be harder to read; as proposed each property is on a separate line.

* }
*
* @param out the output PrintWriter
* @throws ClassCastException if any key in this property list
* is not a string.
* @since 1.1
Expand Down