Convert int to unsigned short java

问题

I have written a .obj parser in java to modelize 3D objects on iPhone. I would like to export the data as a binary file, which must be as small as possible. I have plenty of indices that would fit a unsigned short, but they are represented as int in java.

I would like to use the ByteBuffer class to do the conversion just before writing the data in a file. I suppose I will have to manipulate bytes before pushing them into the ByteBuffer but I have no idea how to do so.

Thank you in advance if you can help me.

回答1:

In Java, an unsigned short can be represented as a char. Just cast the int to char and use putChar() on the ByteBuffer.

myBuffer.putChar((char) my16BitInt);

回答2:

short toUint16(int i)
{
    return (short) i;
}

int toUint32(short s)
{
    return s & 0xFFFF;
}

回答3:

You can extract single bytes from your integers with

int i;
byte b1 = i & 0xFF;
byte b2 = (i >> 8) & 0xFF;

回答4:

Use http://download.oracle.com/javase/6/docs/api/java/io/DataOutputStream.html

dos.writeShort(value & 0xFFFF);

来源：https://stackoverflow.com/questions/6599548/convert-int-to-unsigned-short-java