500+ Guides on Java Top Classes and Methods

This page contains productive guides on important core Java built-in classes and their methods with examples.

Newly Added Java API Guides

java.lang Package API/Methods Guides

java.lang  - java.lang package provides classes that are fundamental to the design of the Java programming language.

java.util Package API/Methods Guides

java.util - java.util package contains the collections framework, legacy collection classes, event model, date and time facilities, internationalization, and miscellaneous utility classes.

java.sql Package API/Methods Guides 

java.sql - The java.sql package provides the API for accessing and processing data stored in a data source (usually a relational database) using the Java programming language.

java.lang.reflect Package API/Methods Guides 

java.lang.reflect - java.lang.reflect package provides classes and interfaces that are used to obtain reflective information about classes and objects.

java.math Package API/Methods Guides 

java.math - java.math package provides classes for performing arbitrary-precision integer arithmetic (BigInteger) and arbitrary-precision decimal arithmetic (BigDecimal).

java.nio.file Package API/Methods Guides 

java.nio.file - java.nio.file package defines interfaces and classes for the Java virtual machine to access files, file attributes, and file systems.

java.util.function Package API/Methods Guides

Functional interfaces provide target types for lambda expressions and method references.

Guides on Java Methods

Java String Class Methods:

Java Map Interface Methods:

Java Map put() example
Java Map get() example
Java Map remove() example
Java Map containsKey() example

Java Set Interface Methods:

Java File Class Methods:

Java Scanner Methods:

Java Consumer Interface Methods:

Java Consumer accept()
Java Consumer andThen()

Java Currency Class Methods:

Java Currency getInstance()

Java SQLDate and SQLTime Class Methods:

Java SQLDate valueOf()
Java SQLTime valueOf()

Java PreparedStatement Interface Methods:

Java PreparedStatement setString()
Java PreparedStatement executeQuery()

Java DriverManger Class Methods:

Java DriverManager getConnection()

Java Connection Interface Methods:

Java Statement Interface Methods:

Java Clob and Blob Class Methods:

Java Clob getSubString()
Java Blob getBytes()

Java ArrayDeque Class Methods:

Java ArrayDeque poll()
Java ArrayDeque push()
Java ArrayDeque pop()

Java HashSet and LinkedHashSet Class Methods:

Java MessageDigest Class Methods

Java MessageDigest getInstance()

Java Pattern Class Methods

Java Pattern asMatchPredicate()


  1. Content is very good and most of the java topic are covered. Best for beginner and advanced learners. Keep posting more blog. Thank you sir

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