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CharArrayWriter The CharArrayWriter class creates a character buffer in memory and all the character sent to one or more file is stored in the buffer. The buffer of CharArrayWriter automatically grows according to data. In this stream, the data is written into a character array. This class inherits Writer class. CharArrayWriter also has a close( … Read more…
ByteArrayInputStream ByteArrayInputStream class contains an internal buffer which is used to read byte array as stream. In this stream, the data is read from a byte array. Being a subclass of InputStream the ByteArrayInputStream also has a close( ) method. But calling the close( ) method has no effect on the ByteArrayInputStream. ByteArrayInputStream Constructors Constructors Description … Read more…
ByteArrayOutputStream The ByteArrayOutputStream class stream creates a buffer in memory and all the data sent to one or more stream is stored in the buffer. The buffer of ByteArrayOutputStream automatically grows according to data. In this stream, the data is written into a byte array. You write your data to the ByteArrayOutputStream and when you … Read more…
Regular Expressions with String Class If all you want to do with a regular expression is check to see whether a string matches a pattern, you can use the matches( ) method of the String class. This method accepts a regular expression as a parameter and returns a boolean that indicates whether or not the … Read more…
Negative Lookbehind Negative lookbehind is usually useful if we want to match something not proceeded by something else. We can make our own negative lookbehinds with the lookbehind operator (?<!). For example, to match two characters not proceeded by four digit, we could use : More Examples Negative lookbehind After the Match Examples Program Program Source import … Read more…
Lookbehind Lookbehind is just like Lookahead. They only assert whether immediate portion behind a given input string’s current portion is suitable for a match or not. We can make our own lookbehinds with the lookbehind operator (?<=). Lookbehind Before the Match Examples Lookbehind with Lookahead Lookbehind After the Match Examples Program Program Source … Read more…