Introduction to Programming

Comma ","

The comma , is used for the separation of method parameters, listed in parentheses:

void someMethod(int i, String s, int j) {  //...  String s = anotherMethod(5, 6.1, "another param");  //...}

A comma can also be used to separate variables of the same type in the declaration statement:

int i, j = 2; k;

In the preceding example, all three variables, i, j, and k, are declared to be of the int type, but only variable j is initialized to 2.

The use of a comma in a looping statement serves the same purpose of the declaration of multiple variables (see Chapter 10, Control Flow Statements):

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