1 /* Licensed to the Apache Software Foundation (ASF) under one or more 2 * contributor license agreements. See the NOTICE file distributed with 3 * this work for additional information regarding copyright ownership. 4 * The ASF licenses this file to You under the Apache License, Version 2.0 5 * (the "License"); you may not use this file except in compliance with 6 * the License. You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package java.lang; 18 19 import java.io.IOException; 20 import java.nio.CharBuffer; 21 22 /** 23 * Represents a sequence of characters that can be incrementally read (copied) 24 * into a {@link CharBuffer}. 25 */ 26 public interface Readable { 27 28 /** 29 * Reads characters into the specified {@code CharBuffer}. The maximum 30 * number of characters read is {@code CharBuffer.remaining()}. 31 * 32 * @param cb 33 * the buffer to be filled with characters read. 34 * @return the number of characters actually read, or -1 if this 35 * {@code Readable} reaches its end 36 * @throws IOException 37 * if an I/O error occurs. 38 */ read(CharBuffer cb)39 int read(CharBuffer cb) throws IOException; 40 } 41