What is Java? · Java

Ch 1 · Introduction to Programming & Java — card 2 of 2.

Java is one of the most widely used programming languages in the world. It is famous for its motto "write once, run anywhere" — code you write on one computer runs on almost any other, thanks to the Java Virtual Machine (JVM). Java is strict and organised, which makes it an excellent language for learning solid programming habits.

Why Java is worth learning:

• ✅ Powers Android apps, huge business systems, and websites
• ✅ Strongly typed — it catches many mistakes before the program runs
• ✅ Object-oriented from the ground up — great for big projects
• ✅ Runs on billions of devices through the JVM

Where Java is used in the real world:

• 📱 Android mobile apps
• 🏦 Banking and enterprise systems
• 🌐 Large-scale web servers
• 🔬 Scientific and big-data tools