如何用Java封装一个自定义的方法？

Question

想试着用Java封装一个readChars()方法
功能和readUTF()功能类似
输出数据流中用writeChars()方法写入的字符串

Answer 1

基本问题。写一个案例：

public static String readChars(DataInputStream dis) throws IOException {
    int len = dis.readInt();
    char[] chars = new char[len];
    for (int i = 0; i < len; i++) {
        chars[i] = dis.readChar();
    }
    return new String(chars);
}
String str = "test!";
ByteArrayOutputStream baos = new ByteArrayOutputStream();
DataOutputStream dos = new DataOutputStream(baos);
dos.writeInt(str.length());
dos.writeChars(str);
byte[] bytes = baos.toByteArray();
ByteArrayInputStream bais = new ByteArrayInputStream(bytes);
DataInputStream dis = new DataInputStream(bais);
String result = readChars(dis);
System.out.println(result);