缓冲流的使用

任意找一个.java 文件，把该文件的每一行读取到一个 String 数组中，然后在每一行前面加上一个行号，重新写入到该文件。

（要求使用 BufferedReader 和 BufferedWriter）

package bufferedreader;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;

public class test {

	public static void main(String[] args) {
		File file=new File("C:/Users/xzy/Desktop/JoinExample.java");
		try {
			FileInputStream fileInputStream=new FileInputStream(file);
			InputStreamReader inputStreamReader=new InputStreamReader(fileInputStream);
			BufferedReader bufferedReader=new BufferedReader(inputStreamReader);
			
			
			int n=0;
			while ((bufferedReader.readLine())!=null) {
				
				n++;
			}
			
			FileInputStream fileInputStream1=new FileInputStream("C:/Users/xzy/Desktop/JoinExample.java");

            InputStreamReader fileReader1=new InputStreamReader(fileInputStream1);

            BufferedReader bufferedReader1=new BufferedReader(fileReader1);
			
            String[] line=new String[n];
				
				while ((bufferedReader1.readLine())!=null) {
					for (int i = 0; i < line.length; i++) {
						line[i]=(i+"--"+bufferedReader1.readLine());
						
					}
				}
			FileWriter fileWriter=new FileWriter("C:/Users/xzy/Desktop/JoinExample.java");
	        BufferedWriter bufferedWriter=new BufferedWriter(fileWriter);
	           for (int j = 0; j < line.length; j++) {
	                bufferedWriter.newLine();
	                bufferedWriter.write(line[j]);
	            }
			inputStreamReader.close();
			bufferedReader.close();
			bufferedReader1.close();
			bufferedWriter.close();
		} catch (FileNotFoundException e) {
			// TODO 自动生成的 catch 块
			e.printStackTrace();
		} catch (IOException e) {
			// TODO 自动生成的 catch 块
			e.printStackTrace();
		}

}
}