字符流的练习之5种方式复制文本文件

public class Demo1 {
	public static void main(String[] args) throws IOException {
		// 基本的字符流一次读写一个字符
		method1();
	// 基本的字符流一次读写一个字符数组
	method2();

	// 高效的字符流一次读写一个字符
	method3();

	// 高效的字符流一次读写一个字符数组
	method4();

	// 高效的字符流一次读写一行 !!!
	method5();
}

private static void method5() throws IOException {// !!!
	BufferedReader br = new BufferedReader(new FileReader("ToStringDemo.java"));
	BufferedWriter bw = new BufferedWriter(new FileWriter("copy.java"));

	String line;

	while ((line = br.readLine()) != null) {
		bw.write(line);
		bw.newLine();
		bw.flush();
	}

	br.close();
	bw.close();

}

private static void method4() throws IOException {
	BufferedReader br = new BufferedReader(new FileReader("ToStringDemo.java"));
	BufferedWriter bw = new BufferedWriter(new FileWriter("copy.java"));

	char[] chs = new char[1024];
	int len;
	while ((len = br.read(chs)) != -1) {
		bw.write(chs, 0, len);
	}

	br.close();
	bw.close();
}

private static void method3() throws IOException {
	BufferedReader br = new BufferedReader(new FileReader("ToStringDemo.java"));
	BufferedWriter bw = new BufferedWriter(new FileWriter("copy.java"));

	int ch;
	while ((ch = br.read()) != -1) {
		bw.write(ch);
	}

	br.close();
	bw.close();
}

private static void method2() throws IOException {
	FileReader fr = new FileReader("ToStringDemo.java");

	FileWriter fw = new FileWriter("copy.java");

	char[] chs = new char[1024];
	int len;
	while ((len = fr.read(chs)) != -1) {
		fw.write(chs, 0, len);
	}

	fr.close();
	fw.close();

}

private static void method1() throws IOException {
	FileReader fr = new FileReader("ToStringDemo.java");

	FileWriter fw = new FileWriter("copy.java");

	int ch;
	while ((ch = fr.read()) != -1) {
		fw.write(ch);
	}

	fr.close();
	fw.close();

}

}