What Is Java? Uses, Examples and Careers

Java is one of the world's most popular programming languages. Banks, enterprise software, Android apps and many projects at companies like TCS, Infosys, Wipro and Zoho are built in Java. It is one of the most requested skills for freshers in India.

SPSkill Park AcademyErode · Chennai 8 मिनट में पढ़ें अपडेट किया गया 6 Oct 2026

Your first Java program

Every Java program lives in a class and starts from the main() method. Run it and see.

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Java

Output Loading Java (first time takes a few seconds)

Press Run to see the result here.

How Java works: the JVM

Java code is compiled into bytecode, which the Java Virtual Machine (JVM) runs. Because there is a JVM for Windows, Linux and Mac, the same program runs everywhere: "write once, run anywhere".

What is Java used for?

Java's main uses:

Enterprise and banking software (Spring Boot)
Android apps
Web backends and APIs
Big data tools (Hadoop, Kafka)

Java's key idea: OOP

Java is object-oriented: classes, objects, inheritance and polymorphism. These ideas come up in almost every interview.

ख़ुद करके देखें· कोड बदलें और Run दबाएँ

Java

Output Loading Java (first time takes a few seconds)

Press Run to see the result here.

How to learn Java free

Skill Park Learn has 34 Java lessons in Tamil and English, from Scanner input to OOP, collections and exceptions, with an online Java compiler, a Java mock test and a free certificate.

अक्सर पूछे जाने वाले सवाल

Is Java hard for beginners?

It has more syntax than Python, but it is very learnable step by step.

Are Java and JavaScript the same?

No. Only the names are similar; they are different languages.

Do freshers get Java jobs?

Yes. Service companies hire many freshers with Java skills.