I know that strings are immutable, but how this work
String s1 = "Java";
System.out.println(s1.toUpperCase()); //will show in capital
String s2="Stack overflow";
s2.toUpperCase();
System.out.println(s2); //won't show in capital
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hewa jalal
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1Because you don't assign `s2.toUpperCase()` to s2. – forpas Apr 16 '19 at 19:32
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@forpas but why s1 worked and i didn't assign it to s1. – hewa jalal Apr 16 '19 at 19:33
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Because you didn't print `s1`, you printed the result of `s1.toUpperCase()`. – chrylis -cautiouslyoptimistic- Apr 16 '19 at 19:34
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You print `s1.toUpperCase()` not `s1`. – forpas Apr 16 '19 at 19:34
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ohhhh how did i mistaken that, thank you guys. – hewa jalal Apr 16 '19 at 19:34