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Good observation -however, I do think disclosing that Java arrays are storage objects instead of functional objects like a list should be done as early as possible to Java learners. Doing so through the lack of toString override on arrays evident in IO.println
is a good way.</div>
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(On a side note, the simplified main hides the argument array, which allows us to introduce array later into the learning process)</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> amber-dev <amber-dev-retn@openjdk.org> on behalf of Ethan McCue <ethan@mccue.dev><br>
<b>Sent:</b> Saturday, June 28, 2025 12:05 PM<br>
<b>To:</b> David Alayachew <davidalayachew@gmail.com><br>
<b>Cc:</b> amber-dev <amber-dev@openjdk.org><br>
<b>Subject:</b> Re: IO.println behavior on char[]</font>
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<div dir="auto">Yeah it's easy enough to work around, just noting the divergence </div>
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<div dir="ltr" class="x_gmail_attr">On Sat, Jun 28, 2025, 12:42 PM David Alayachew <<a href="mailto:davidalayachew@gmail.com">davidalayachew@gmail.com</a>> wrote:<br>
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<p dir="ltr">Ah, I see you were referring to System.out. </p>
<p dir="ltr">Adding that overload makes sense. Though, I would rather it default to doing Arrays.toString, as opposed to just the one overload. That way, all arrays would be printable.</p>
<p dir="ltr">That was a common pain point for my students. Try to print an array of objects, and they only get an array address. And since they don't recognize that it's an address, it created some confusing bugs, as they think the hexadecimal address string
was from previous or following print statements.</p>
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<div dir="ltr" class="x_gmail_attr">On Sat, Jun 28, 2025, 12:36 PM David Alayachew <<a href="mailto:davidalayachew@gmail.com" rel="noreferrer noreferrer" target="_blank">davidalayachew@gmail.com</a>> wrote:<br>
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<p dir="ltr">Is there a char[] overload? I just checked the javadoc for 24 and 25, and I only see Object, String, and no-arg overloads. Not char[].</p>
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<div dir="ltr" class="x_gmail_attr">On Sat, Jun 28, 2025, 6:40 AM Ethan McCue <<a href="mailto:ethan@mccue.dev" rel="noreferrer noreferrer noreferrer" target="_blank">ethan@mccue.dev</a>> wrote:<br>
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<div dir="ltr">I was going through some examples in my writing and noticed that<br>
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IO.println(new char[] { 'a', 'b' });<br>
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will hit the Object overload of System.out.println and not the char[] overload<br>
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This breaks a few of my examples <a href="https://javabook.mccue.dev/arrays/aliasing" rel="noreferrer noreferrer noreferrer noreferrer" target="_blank">https://javabook.mccue.dev/arrays/aliasing</a></div>
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