code: ///////////////////////////////////////////////////////////////////////////////////////////////
  // checkstyle: Checks Java source code and other text files for adherence to a set of rules.
  // Copyright (C) 2001-2023 the original author or authors.
  //
  // This library is free software; you can redistribute it and/or
  // modify it under the terms of the GNU Lesser General Public
  // License as published by the Free Software Foundation; either
  // version 2.1 of the License, or (at your option) any later version.
  //
  // This library is distributed in the hope that it will be useful,
  // but WITHOUT ANY WARRANTY; without even the implied warranty of
  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  // Lesser General Public License for more details.
  //
  // You should have received a copy of the GNU Lesser General Public
  // License along with this library; if not, write to the Free Software
  // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  ///////////////////////////////////////////////////////////////////////////////////////////////
  
  package com.puppycrawl.tools.checkstyle.checks.coding;
  
  import com.puppycrawl.tools.checkstyle.StatelessCheck;
  import com.puppycrawl.tools.checkstyle.api.AbstractCheck;
  import com.puppycrawl.tools.checkstyle.api.DetailAST;
  import com.puppycrawl.tools.checkstyle.api.TokenTypes;
  
  /**
   * <p>
   * Checks that there is no method {@code finalize} with zero parameters.
   * </p>
   * <p>
   * See
   * <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html#finalize()">
   * Object.finalize()</a>
   * </p>
   * <p>
   * Rationale: Finalizers are unpredictable, often dangerous, and generally unnecessary.
   * Their use can cause erratic behavior, poor performance, and portability problems.
   * For more information for the finalize method and its issues, see Effective Java:
   * Programming Language Guide Third Edition by Joshua Bloch, &#167;8.
   * </p>
   * <p>
   * To configure the check:
   * </p>
   * <pre>
   * &lt;module name=&quot;NoFinalizer&quot;/&gt;
   * </pre>
   * <p>Example:</p>
   * <pre>
   *  public class Test {
   *
   *      protected void finalize() throws Throwable { // violation
   *          try {
   *             System.out.println("overriding finalize()");
   *          } catch (Throwable t) {
   *             throw t;
   *          } finally {
   *             super.finalize();
   *          }
   *      }
   *  }
   * </pre>
   * <p>
   * Parent is {@code com.puppycrawl.tools.checkstyle.TreeWalker}
   * </p>
   * <p>
   * Violation Message Keys:
   * </p>
   * <ul>
   * <li>
   * {@code avoid.finalizer.method}
   * </li>
   * </ul>
   *
   * @since 5.0
   */
  @StatelessCheck
  public class NoFinalizerCheck extends AbstractCheck {
  
      /**
       * A key is pointing to the warning message text in "messages.properties"
       * file.
       */
      public static final String MSG_KEY = "avoid.finalizer.method";
  
      @Override
      public int[] getDefaultTokens() {
          return getRequiredTokens();
      }
  
      @Override
      public int[] getAcceptableTokens() {
          return getRequiredTokens();
      }
  
      @Override
      public int[] getRequiredTokens() {
          return new int[] {TokenTypes.METHOD_DEF};
      }
  
      @Override
      public void visitToken(DetailAST ast) {
          final DetailAST mid = ast.findFirstToken(TokenTypes.IDENT);
          final String name = mid.getText();
  
          if ("finalize".equals(name)) {
              final DetailAST params = ast.findFirstToken(TokenTypes.PARAMETERS);
              final boolean hasEmptyParamList =
                  params.findFirstToken(TokenTypes.PARAMETER_DEF) == null;
  
              if (hasEmptyParamList) {
                  log(ast, MSG_KEY);
              }
          }
      }
  
  }
  