java IO Reader Writer

package com.cjf.io;import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.DataInputStream;import java.io.FileNotFoundException;import java.io.FileReader;import java.io.FileWriter;import java.io.IOException;import java.io.InputStreamReader;import java.io.LineNumberReader;import java.io.PrintWriter;import java.io.StringBufferInputStream;import java.io.StringReader;public class NewIODemo {/** * @param args */public static void main(String[] args) {//readline();//standard();     // format();line();}/** * 讀一行 */public static void readline(){try {BufferedReader in1 = new BufferedReader(new FileReader("f:/tcp.txt"));String result = new String();while((result = in1.readLine()) != null){System.out.println(result);}in1.close();} catch (FileNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}//標準輸入public static void standard(){try {BufferedReader in2 = new BufferedReader(new InputStreamReader(System.in));System.out.println("請輸入一行");System.out.println(in2.readLine());} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}/** * format memory input */public static void format(){try {DataInputStream in3 = new DataInputStream(new StringBufferInputStream("abcd"));while(in3.available() != 0){System.out.println(in3.readLine());}} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}/** * lineNumber */public  static void line(){try {LineNumberReader li = new LineNumberReader(new BufferedReader(new FileReader("f:/tcp.txt")));BufferedReader in4 = new BufferedReader(li);PrintWriter out1 = new PrintWriter(new BufferedWriter(new FileWriter("f:/writer.txt")));String s = null;while((s = in4.readLine()) != null){out1.println("lineNumber: " + li.getLineNumber()+" : " + s);}out1.close();} catch (FileNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}