Java tutorial
//package com.java2s; /* * Copyright 2015 Yan Zhenjie * * 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.io.BufferedWriter; import java.io.Writer; public class Main { public static BufferedWriter toBufferedWriter(Writer writer) { return writer instanceof BufferedWriter ? (BufferedWriter) writer : new BufferedWriter(writer); } }