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Java IO?????

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Java IO?????????????InputStream?OutputStream?Reader?Writer??????????????????????????????????????????????InputStreamReader?OutputStreamWriter?????

Java IO???????

Java IO???????????

File????

File???????????????????????????????????????????File??????????????????????????????????????????????????????????java.io??????????????????????????

File?????

???File???????????

File?????

public static void main(String[] args) {    File f = new File("D:/sss");    System.out.println("???" + f.getPath());    System.out.println("?????" + f.getAbsolutePath());    System.out.println("????" + f.getName());    System.out.println("??????" + f.isFile());    System.out.println("?????" + f.exists());    System.out.println("??????" + f.isDirectory());    System.out.println("?????" + f.canRead());    System.out.println("?????" + f.canWrite());    System.out.println("??????" + f.canExecute());        try {        System.out.println("??????" + f.createNewFile());    } catch (IOException e) {        e.printStackTrace();    }    System.out.println("?????" + f.mkdir());    System.out.println("???????????" + f.mkdirs());    System.out.println("???" + f.delete());        String[] files = f.list();    for (String file : files) {        System.out.println(file);    }}

???1?????????????

static int count = 0;public static void main(String[] args) {    File f = new File("D:/sss");    listFiles(f);    System.out.println("??? " + count + " ???");}public static void listFiles(File f) {    File[] files = f.listFiles();    for (File file : files) {        count++;        System.out.println("????" + file.getName());        if (file.isDirectory()) {            listFiles(file);        }    }}

???2????????????

public static void main(String[] args) {    File f = new File("D:" + File.separator);    String[] files = f.list();    for (int i = 0; i < files.length; i++) {        System.out.println(files[i]);    }}