新人第一次求救，关于BufferedWriter输出到文本的问题

[weexiaoliang]

读代码没什么问题，但想输出到to.txt，一直不成功

import java.io.*;

class Test{
	public static void main(String agrs[]){
		FileReader fr = null;
		FileWriter fw = null;
		BufferedReader br = null;   
		BufferedWriter bw = null;
		try{
			fr = new FileReader("C:/Users/Administrator/Desktop/运行代码/from.txt");
			fw = new FileWriter("C:/Users/Administrator/Desktop/运行代码/to.txt");
			br = new BufferedReader(fr);
			bw = new BufferedWriter(fw);
			
			String line = null;
			while(true){
				line = br.readLine();
				if(line == null){
					break;
				}
				System.out.println(line);    //这个有显示
				bw.write(line);              //就是这里了，不知道是什么问题
			}
		}
		catch(Exception e){
			System.out.println(e);
		}	
		finally{
			try{
				fw.close();
				br.close();
				fr.close();   
				br.close();
			}
			catch(Exception e){
				System.out.println(e);
			}
		}
	}
}

[阳明 to life]

bw.flush()

[weexiaoliang]

thx 感谢你的回复

[huntor]

        BufferedReader reader = null;
        BufferedWriter writer = null;
        try {
            reader = new BufferedReader(new FileReader("Rocks.java"));
            writer = new BufferedWriter(new FileWriter("Rocks.txt"));

            for (String line = reader.readLine(); line != null; line = reader.readLine()) {
                System.out.println(line);
                writer.write(line);
                writer.newLine();
            }
        } catch(Exception e){
            System.out.println(e);
        } finally {
            try {
                writer.close();
                reader.close();
            } catch(Exception e){
                System.out.println(e);
            }
        }

[huntor]

close时会flush。