public class FileWriter_ {
    public static void main(String[] args) {
        String filePath = "D:\\note.txt";
        FileWriter fileWriter = null;
        char[] chars = {'a', 'b', 'c'};
        try {
            fileWriter = new FileWriter(filePath); //默認是覆蓋寫入
            //1.write(int):寫入單個字符
            fileWriter.write('L');
            //2.write(char[]):寫入指定數(shù)組
            fileWriter.write(chars);
            //3.write(char[],off,len):寫入指定數(shù)組的指定部分
            fileWriter.write("IO流操作".toCharArray(), 0, 3);
            //4.write(String):寫入整個字符串
            fileWriter.write("你好上海");
            //5.write(string,off,len):寫入字符串的指定部分
            fileWriter.write("上海深圳", 0, 2);
            //在數(shù)據(jù)量大的情況下,可以使用循環(huán)操作
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            //對應的FileWriter,一定要關閉流，或者flush才能真正的把數(shù)據(jù)寫入到文件
            try {
                if (fileWriter != null) {
                    //fileWriter.flush();
                    //關閉文件流，等價于flush()+關閉
                    fileWriter.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        System.out.println("程序結束！");
    }
}

 	@Test
    public void FileWriteTest() throws IOException {
        //1.提供File類的對象
        File file = new File("hello1.txt");
        //2.FileWriter流的實例化
        FileWriter fw = new FileWriter(file);
        //3.數(shù)據(jù)的寫出操作
        fw.append("Android 開發(fā)\n");
        fw.append("Java 開發(fā)");
        //4.資源的關閉
        fw.close();
    }