Force.com Apex Code Developer's Guide

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For Loops

Apex supports three variations of the for loop:
  • The traditional for loop:
    1for (init_stmt; exit_condition; increment_stmt) {
2    code_block
3}
  • The list or set iteration for loop:
    1for (variable : list_or_set) {
2    code_block
3}
    where variable must be of the same primitive or sObject type as list_or_set.
  • The SOQL for loop:
    1for (variable : [soql_query]) {
2    code_block
3}
    or
    1for (variable_list : [soql_query]) {
2    code_block
3}
    Both variable and variable_list must be of the same sObject type as is returned by the soql_query.

Curly braces ({}) are required around a code_block only if the block contains more than one statement.

Note

Each is discussed further in the sections that follow.