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<p class="MsoNormal">Hi,</p>
<p class="MsoNormal">I’m updating my classroom examples to run on JDK 23 and with IO.println I experience different behavior than with System.out.println. Following example explains the issue.</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thank you,</p>
<p class="MsoNormal">Adam</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="background:white"><span style="font-size:9.0pt;font-family:"Courier New";color:#336BDD;mso-ligatures:none">static</span><span style="font-size:9.0pt;font-family:"Courier New";color:black;mso-ligatures:none">
</span><span style="font-size:9.0pt;font-family:"Courier New";color:#336BDD;mso-ligatures:none">void</span><span style="font-size:9.0pt;font-family:"Courier New";color:black;mso-ligatures:none">
<b><i>doSomething</i></b>() {<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:9.0pt;font-family:"Courier New";color:black;mso-ligatures:none">
</span><span style="font-size:9.0pt;font-family:"Courier New";color:#336BDD;mso-ligatures:none">try</span><span style="font-size:9.0pt;font-family:"Courier New";color:black;mso-ligatures:none"> {<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:9.0pt;font-family:"Courier New";color:black;mso-ligatures:none"> Thread.<i>sleep</i>(1000);<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:9.0pt;font-family:"Courier New";color:black;mso-ligatures:none"> }
</span><span style="font-size:9.0pt;font-family:"Courier New";color:#336BDD;mso-ligatures:none">catch</span><span style="font-size:9.0pt;font-family:"Courier New";color:black;mso-ligatures:none"> (InterruptedException ignore) {}<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:9.0pt;font-family:"Courier New";color:black;mso-ligatures:none">}<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:9.0pt;font-family:"Courier New";color:black;mso-ligatures:none"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:9.0pt;font-family:"Courier New";color:#336BDD;mso-ligatures:none">void</span><span style="font-size:9.0pt;font-family:"Courier New";color:black;mso-ligatures:none">
<b>main</b>() {<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:9.0pt;font-family:"Courier New";color:black;mso-ligatures:none"> Thread.<i>ofVirtual</i>().start(() -> {<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:9.0pt;font-family:"Courier New";color:black;mso-ligatures:none">
</span><span style="font-size:9.0pt;font-family:"Courier New";color:#336BDD;mso-ligatures:none">while</span><span style="font-size:9.0pt;font-family:"Courier New";color:black;mso-ligatures:none"> (</span><span style="font-size:9.0pt;font-family:"Courier New";color:#336BDD;mso-ligatures:none">true</span><span style="font-size:9.0pt;font-family:"Courier New";color:black;mso-ligatures:none">)
{<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:9.0pt;font-family:"Courier New";color:black;mso-ligatures:none">
<i>doSomething</i>();<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:9.0pt;font-family:"Courier New";color:black;mso-ligatures:none"> System.</span><i><span style="font-size:9.0pt;font-family:"Courier New";color:#CE54B8;mso-ligatures:none">out</span></i><span style="font-size:9.0pt;font-family:"Courier New";color:black;mso-ligatures:none">.println(</span><span style="font-size:9.0pt;font-family:"Courier New";color:#1E9347;mso-ligatures:none">"I
do something until you press Enter"</span><span style="font-size:9.0pt;font-family:"Courier New";color:black;mso-ligatures:none">);<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:9.0pt;font-family:"Courier New";color:black;mso-ligatures:none"> }<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:9.0pt;font-family:"Courier New";color:black;mso-ligatures:none"> });<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:9.0pt;font-family:"Courier New";color:black;mso-ligatures:none"> Thread.<i>ofVirtual</i>().start(() -> {<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:9.0pt;font-family:"Courier New";color:black;mso-ligatures:none">
</span><span style="font-size:9.0pt;font-family:"Courier New";color:#336BDD;mso-ligatures:none">while</span><span style="font-size:9.0pt;font-family:"Courier New";color:black;mso-ligatures:none"> (</span><span style="font-size:9.0pt;font-family:"Courier New";color:#336BDD;mso-ligatures:none">true</span><span style="font-size:9.0pt;font-family:"Courier New";color:black;mso-ligatures:none">)
{<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:9.0pt;font-family:"Courier New";color:black;mso-ligatures:none">
<i>doSomething</i>();<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:9.0pt;font-family:"Courier New";color:black;mso-ligatures:none">
<i>println</i>(</span><span style="font-size:9.0pt;font-family:"Courier New";color:#1E9347;mso-ligatures:none">"I'm blocked until you press Enter"</span><span style="font-size:9.0pt;font-family:"Courier New";color:black;mso-ligatures:none">);<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:9.0pt;font-family:"Courier New";color:black;mso-ligatures:none"> }<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:9.0pt;font-family:"Courier New";color:black;mso-ligatures:none"> });<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:9.0pt;font-family:"Courier New";color:black;mso-ligatures:none">
<i>readln</i>(</span><span style="font-size:9.0pt;font-family:"Courier New";color:#1E9347;mso-ligatures:none">""</span><span style="font-size:9.0pt;font-family:"Courier New";color:black;mso-ligatures:none">);<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:9.0pt;font-family:"Courier New";color:black;mso-ligatures:none">}<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;mso-ligatures:none"><o:p> </o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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