Additional Java SE Packages

Practice Programs on JDBC With H2

java.sql(JDBC), Additional Java SE Packages /

Concurrent collections are specialized data structures in programming that facilitate safe and efficient manipulation of shared data by multiple threads in a concurrent environment. Traditional collections, like lists, queues, or maps, often face issues like race conditions when accessed by multiple threads simultaneously. Concurrent collections address these issues by providing built-in thread-safe operations. Concurrent collections […]

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Matches exactly n occurrences of the preceding character or group ({n})

java.util.regex /

1. Match Exactly 3 Occurrences Using {n} This program demonstrates the {n} quantifier in Java regular expressions. The {n} matches exactly n occurrences of the preceding character or group. Here, {3} matches exactly three consecutive occurrences of the character a. 2. Match Exactly 2 Digits Using {n} This program uses {2} to match exactly two

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Matches n or more occurrences of the preceding character or group ({n,})

Additional Java SE Packages, java.util.regex /

1. Match 3 or More Occurrences Using {n,} This program demonstrates the {n,} quantifier in Java regular expressions. The {n,} matches n or more consecutive occurrences of the preceding character or group. Here, {3,} matches three or more consecutive a characters. 2. Match 2 or More Digits Using {n,} This program uses {2,} to match

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Matches between n and m occurrences of the preceding character or group ({n,m})

java.util.regex /

1. Match Between 2 and 4 Occurrences Using {n,m} This program demonstrates the {n,m} quantifier in Java regular expressions. The {n,m} matches at least n and at most m occurrences of the preceding character or group. Here, {2,4} matches between two and four consecutive a characters. 2. Match Between 2 and 3 Digits Using {n,m}

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Practice Programs on Character Classes and Quantifiers

java.util.regex /

1. Match Digits Using Character Class and Quantifier This program uses the character class \d to match digits. The + quantifier matches one or more consecutive digits. It finds and displays all numbers present in the input. 2. Match Letters Using Character Class and Quantifier This program uses [a-zA-Z] to match English alphabetic characters. The

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java.util.Matcher

java.util.regex /

java.util.regex.Matcher is a class used to perform matching operations on text using a Pattern. It checks whether text matches a regular expression and can also find matching portions of text. Matcher is commonly used for validation, searching, extracting, and replacing text. It works closely with the Pattern class in the java.util.regex package. Important Features: Checks

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FileOutputStream

java.io and java.nio /

The FileOutputStream class in Java is used to write raw bytes to a file. It is part of the java.io package and is typically used for binary data (images, audio, etc.) or writing bytes to text files. Commonly Used Constructors and Methods Simple Program Mahesh wants to write the message “Hello LotusJavaPrince!” into a file

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