antlr

expression
    :   assignmentExpression
    |   expression ',' assignmentExpression
    ;

assignmentExpression
    :   additiveExpression
    |   Identifier assignmentOperator additiveExpression
    ;

assignmentOperator
    :   '='
    |   '*='
    |  '/='
    |   '%='
    |   '+='
    |   '-='
    ;

additiveExpression
    :   multiplicativeExpression
    |   additiveExpression '+' multiplicativeExpression
    |   additiveExpression '-' multiplicativeExpression
    ;

multiplicativeExpression
    :   primaryExpression
    |   multiplicativeExpression '*' primaryExpression
    |   multiplicativeExpression '/' primaryExpression
    |   multiplicativeExpression '%' primaryExpression
    ;

age + 10 * 2  + 10
^D

statement : 
         ...
          | FOR '(' forControl ')' statement
         ...
          ;

forControl 
          : forInit? ';' expression? ';' forUpdate=expressionList?
          ;

forInit 
          : variableDeclarators 
          | expressionList 
          ;

expressionList
          : expression (',' expression)*
          ;

for (int i = 0; i < 10; i++){
  println(i);
}