create a class to construct a string for a node of method declaration
create a class to construct a string for a node of for statement
[BUG_FIX] modify the return value of getBlockStr() for the correct value
create a class to construct a string for a node of for-each statement
create a class to construct a string for a node of do-while statement
create a class to construct a string for a node of if statement
create a class to construct a string for a node of if statement
create a class to construct a string for a node of else statement
[BUG_FIX] modify the return value of getBlockStr() in IfStatementStringBuilder for the correct value
create a class to construct a string for a node of switch statement