Java I/O - 如何逐行比較文本文件

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/*   
* Copyright 2004 The Apache Software Foundation
*
*   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.
*/
//based on Apache technology http://www.apache.org
import java.io.IOException;
import java.io.LineNumberReader;
import java.io.Reader;
import java.util.List;
public class Diff
{
    public static void readersAsText(Reader r1, String name1, Reader r2, String name2,
        List diffs)
        throws IOException
    {
        LineNumberReader reader1 = new LineNumberReader(r1);
 
 
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