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As per Java's standard we should follow CamelCase. But why String's method substring() is not in camelCase ? Is it for any specific reason or just an mistake from the initial days ?
I'd say because substring is one physical word.
camelCase is used to separate words, substring is not to be intended as Sub String but as Substring... so the convention is respected.
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When a constant variable ends with a number, do you need to put an underscore in between the number and the rest of the variable?
I haven't found a Java naming convention for this case.
For example YELLOW3 or YELLOW_3
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Regular expression only accepts 0 or 5.
Is there a regex expression to evaluate that?
Thanks.
You can use either "0|5" or "[05]". The first is an alternative, the second is a character class. They will behave identically. See the documentation for Pattern for more information on the building blocks for regular expressions.
Read this. And use this:
"^[05]$"
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Why Java 7 include feature of underscore numeric literals why not comma numeric literals?
The "," operator already has meaning, so existing code would change meaning:
// Is this 3 values or 2?
int[] values = { 123,456, 789 };
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I am currently writing a game in Java, where words in a string will have to be all changed to equal 5 characters a word.
eg. I am writing in Java
Iamwr iting inJav a
I wonder if anyone knows how I would do this?
First remove spaces between words.
Then split that resulting String to length with 5.
Add a space after every 5 character.
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How does substring method work internally and how can it create memory issue ?
How can we solve it?
Prior to Java 7 udate 6, substring used to return a view on the original string. So imagine you had a String of 1,000,000 characters and called s.substring(0, 1) because you are only interested in the first character, the original string would have stayed in memory.
Since Java 7u6 substring returns a new string which prevents that issue.