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How to check if a string contains only digits in Java [duplicate]
In Java for String class there is a method called matches, how to use this method to check if my string is having only digits using regular expression. I tried with below examples, but both of them returned me false as result.
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“The given path's format is not supported.”
...ombine instead:
Path.Combine(str_uploadpath, fileName);
which returns a string.
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Swift - encode URL
If I encode a string like this:
17 Answers
17
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How do I use the conditional operator (? :) in Ruby?
..." : "false" then expected puts to return the boolean which then became the string value.
– Fresheyeball
Aug 25 '15 at 23:16
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C++: What is the size of an object of an empty class?
...aligned on a word boundary (such as an integer). For example, if you place char x; int y; inside the class, my GCC clocks it at eight bytes (since the second int must be aligned in that implementation).
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Python string class like StringBuilder in C#?
Is there some string class in Python like StringBuilder in C#?
8 Answers
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How does this program work?
...oat is converted to double, as the prototype of printf is int printf(const char*, ...), from 6.5.2.2/7,
The ellipsis notation in a function prototype declarator causes argument type conversion to stop after the last declared parameter. The default argument promotions are performed on trailing ar...
Why don't Java's +=, -=, *=, /= compound assignment operators require casting?
...57
or
byte b = 100;
b /= 2.5;
System.out.println(b); // prints 40
or
char ch = '0';
ch *= 1.1;
System.out.println(ch); // prints '4'
or
char ch = 'A';
ch *= 1.5;
System.out.println(ch); // prints 'a'
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reference assignment is atomic so why is Interlocked.Exchange(ref Object, Object) needed?
...ces:
"Reads and writes of the following
data types are atomic: bool, char,
byte, sbyte, short, ushort, uint, int,
float, and reference types."
So, you can write to the volatile reference without risk of getting a corrupted value.
You should of course be careful with how you decide which...
What is the list of valid @SuppressWarnings warning names in Java?
...witch statement (enum case)
nls to suppress warnings relative to non-nls string literals
null to suppress warnings relative to null analysis
restriction to suppress warnings relative to usage of discouraged or
forbidden references
serial to suppress warnings relative to missing serialVersi...