Can java work on a smatphone?

Question

I don't have a pc ....can I practice java on a smartphone?

Answer 1

Java is a massive language but the number one feature is that it is portable to any device with Java Runtime Environment (JRE). If you want to learn java and develop your own programs, then you will need a Java Development Kit (JDK). The JDK includes the JRE and the java bytecode compiler to compile your sourcecode. 

As for the apps to run and compile - There are several alternatives and it's all just personal preference.

To summarize;
RUN JAVA: JRE (required)
COMPILE JAVA: JDK (required)

Dr.

Answer 2

You can use AIDE or practice here in the playground.