code: /*
  RequireThis
  checkFields = (default)true
  checkMethods = (default)true
  validateOnlyOverlapping = false
  
  
  */
  
  package com.puppycrawl.tools.checkstyle.checks.coding.requirethis;
  
  public class InputRequireThisSimple {
          private final int number = 1;
  
      public int check() {
          int sum = number; // violation 'Reference to instance variable 'number' needs "this.".'
          sum += other(); // violation 'Method call to 'other' needs "this.".'
          return sum;
      }
  
      private int other() {
              return 0;
      }
  }
  