java 自定义LineNumerReader

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import java.io.BufferedReader;import java.io.FileNotFoundException;import java.io.FileReader;import java.io.IOException;import java.io.Reader;public class MyLineNumberReaderDemo {public static void main(String[] args) {MyLineNumberReader mn  = null;try {mn = new MyLineNumberReader(new FileReader("src/LineNumberReaderDemo.java"));mn.setLineNumber(10);for(String line;(line=mn.readLine())!=null;) {System.out.println(mn.getLineNumber() + " " + line);}} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();} finally {try {if(mn != null) {mn.close();mn = null;}} catch (IOException e) {e.printStackTrace();}}}}class MyLineNumberReader extends BufferedReader{private int lineNumber;MyLineNumberReader(Reader r) {super(r);}public String readLine() throws IOException {lineNumber++;return super.readLine();}public int getLineNumber() {return lineNumber;}public void setLineNumber(int lineNumber) {this.lineNumber = lineNumber;}}

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