Why Java is a case-sensitive?

Java is case-sensitive because it uses a C-style syntax . In most programming languages, case sensitivity is the norm. Case-sensitive is useful because it lets you infer what a name means based on its case. In Java code, upper letters and lower letters both are represented differently at the lowest level.

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Is replaceAll a regex?

The replaceAll() method replaces each substring of this string (the String on which it is called) that matches the given regular expression with the given replacement. It internally uses classes like Pattern and Matcher from java. util. regex package for searching and replacing matching characters or substring.

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