java之LineNumberReader

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LineNumberReader比BufferedReader多了个功能，就是可以返回当前行号。另外setLineNumber能改变行号，却不能改变读的位置。

测试代码：

package com.io;import java.io.Closeable;import java.io.FileNotFoundException;import java.io.FileReader;import java.io.IOException;import java.io.LineNumberReader;import junit.framework.TestCase;public class TestLineNumberReader extends TestCase {public void testLineNumberReader() {LineNumberReader lineNumberReader = null;FileReader fileReader = null;try {fileReader = new FileReader("c:/TestLineNumberReader.txt");lineNumberReader = new LineNumberReader(fileReader);String line = null;while ((line = lineNumberReader.readLine()) != null) {System.out.println(lineNumberReader.getLineNumber() + ": " + line);}} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();} finally {close(lineNumberReader);close(fileReader);}}private void close(Closeable closeable) {if (closeable != null) {try {closeable.close();closeable = null;} catch (IOException e) {e.printStackTrace();}}}}

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