java - 如何从 J2ME 中的另一个类对象中获取 byte[] 对象？

Question

我知道在J2ME中，我可以byte[]使用该getBytes()方法从 String 对象中获取对象。我的问题是：是否可以byte[]从任何其他对象获取对象class type？另外：是否可以byte[]从用户定义的类对象中获取对象？

Answer 1

Is it possible to get a byte[] object from any other class type ?

Some classes may implement a simular service.

Is it possible to get a byte[] object from a user-defined class object ?

Not without you writing the conversion yourself.

---

Example how to do it yourself (just note that the DataOutputStream handles the conversion, for example which byte order that is used):

ByteArrayOutputStream out = new ByteArrayOutputStream();
{
    // conversion from "yourObject" to byte[]
    DataOutputStream dos = new DataOuputStream(out);
    dos.writeInt(yourObject.intProperty);
    dos.writeByte(yourObject.byteProperty);
    dos.writeFloat(yourObject.floatProperty);
    dos.writeChars(yourObject.stringProperty);
    dos.close();
}
byte[] byteArray = out.toByteArray();

Answer 2

getBytes();

是 String 类中的方法，它转换你的String into byte Array..
因此，如果你想在你的类中赋予这种类型的转换函数，
user-defined class object
那么你必须自己植入该函数。
就像 EX：-

public class MyClass{
    public byte[]  myConvertor(String str){
        // do your logic here ... 
    }
}