Java Array Initialization at runtime

Question

I am working on Java based COM program, when I send data in this format so it works:

serialPort.writeBytes( new byte[] { (byte)3, (byte)0, (byte)0, 
                                    (byte)0, (byte)4, (byte)5} );

but when I do following so it does not, where am I doing wrong?

byte[] bcode = null;
bcode[0] = (byte)3;
bcode[1] = (byte)0;
bcode[2] = (byte)0;
bcode[3] = (byte)0;
bcode[4] = (byte)4;
bcode[5] = (byte)5;
serialPort.writeBytes(bcode);

You have to initialize your array before assigning values to it. — Perception
– Perception, Commented Mar 8, 2013 at 0:32

rgettman · Accepted Answer · 2013-03-08 00:32:02Z

6

On the second example, you did not create your array, you assigned it null. You can't reference an array element of an array that doesn't exist. You could do

byte[] bcode = new byte[6];

That will create your array with space for 6 bytes. Then assign your values individually.

answered Mar 8, 2013 at 0:32

rgettman

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