To declare a variable of type int with the name score, we would type:

int score;

That's it. Simply state the type, in this case, int, then leave a space and type the name you want to use for the variable. Note also the semicolon ; on the end of the line will tell the compiler that we are done with this line and what follows, if anything, is not part of the declaration.

Similarly, for almost all the other variable types, the declaration would occur in the same way. Here are some examples. This process is like reserving a labeled storage box in the warehouse. The variable names used next are arbitrary.

long millisecondsElapsed;
float subHorizontalPosition;
boolean debugging;
String playerName;

So now we have reserved a space in the warehouse that is the Android device's memory, how do we put a value into that space?