ClassWithLambda.java

// Copyright 2015 The Bazel Authors. All rights reserved.
//
// Licensed 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
//
//    http://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.

import java.util.function.Function;

class ClassWithLambda {
  interface Rec extends Function<Rec, Rec> {}

  private static final String HELLO = "Hello World";

  int hash(Function<String, Integer> hashFunc) {
    return hashFunc.apply(HELLO);
  }

  void m() {
    Rec f = x -> x.apply(x);

    int x = hash(String::hashCode);
  }
}