I/O中的缓冲Buffer

1.未使用缓冲

public static void method4() {
		try {
			Writer writer = new FileWriter(new File("D:\\var\\demo.txt"));
			for (int k=0; k<10; k++)
				writer.write('a');
			writer.close();
			System.out.println("结束");
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

2.使用缓冲

public static void method5() {
		try {
			Writer writer = new BufferedWriter(new FileWriter(new File("D:\\var\\demo.txt")));
			for (int k=0; k<10; k++)
				writer.write('a');
			writer.close();
			System.out.println("结束");
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

3.缓冲API

public BufferedWriter(Writer out) // 缓冲默认8K

public BufferedWriter(Writer out, int sz) // 自定义缓冲区