public static void input ( ) {
  Scanner scan = new Scanner ( System . in ) ;
  for ( int i = 0 ;
  i < 4 ;
  i ++ ) {
    for ( int j = 0 ;
    j < 4 ;
    j ++ ) {
      a [ i ] [ j ] = scan . nextInt ( ) ;
    }
  }
}

public static void input ( ) { Scanner scan = new Scanner ( System . in ) ; for ( int i = 0 ; i < 4 ; i ++ ) { for ( int j = 0 ; j < 4 ; j ++ ) { a [ i ] [ j ] = scan . nextInt ( ) ; } } }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters) body: (block (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_identifier) arguments: (argument_list (field_access object: (identifier) field: (identifier)))))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (decimal_integer_literal)) update: (update_expression (identifier)) body: (block (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (decimal_integer_literal)) update: (update_expression (identifier)) body: (block (expression_statement (assignment_expression left: (array_access array: (array_access array: (identifier) index: (identifier)) index: (identifier)) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))))))))))