查看本类的 API文档回源码主页

   /*
    * Copyright 2016 The Netty Project
    *
    * The Netty Project licenses this file to you under the Apache License,
    * version 2.0 (the "License"); you may not use this file except in compliance
    * with the License. You may obtain a copy of the License at:
    *
    *   https://www.apache.org/licenses/LICENSE-2.0
    *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
   * License for the specific language governing permissions and limitations
   * under the License.
   */
  package io.netty.util;
  
  /**
   * Represents a supplier of {@code boolean}-valued results.
   */
  public interface BooleanSupplier {
      /**
       * Gets a boolean value.
       * @return a boolean value.
       * @throws Exception If an exception occurs.
       */
      boolean get() throws Exception;
  
      /**
       * A supplier which always returns {@code false} and never throws.
       */
      BooleanSupplier FALSE_SUPPLIER = new BooleanSupplier() {
          @Override
          public boolean get() {
              return false;
          }
      };
  
      /**
       * A supplier which always returns {@code true} and never throws.
       */
      BooleanSupplier TRUE_SUPPLIER = new BooleanSupplier() {
          @Override
          public boolean get() {
              return true;
          }
      };
  }