Java

Java is the basis for the Android operating system and the most common language for developing Android apps. Java, a general-purpose language, has been a mainstay in the world of computer programming for more than 20 years. The key to its popularity has been it “write once, run anywhere” philosophy. Theoretically, you can write Java software on any device, compile it into low-level machine code, and then execute it on any platform that’s equipped with a Java Virtual Machine (JVM). This means Java is highly cross-platform compatible.