Int cannot be converted to bytes using java

Question

I am trying to convert my integer value to bytes which is to unsigned bytes. I heard that java bytes only provide until 127. Then I tried to reedit my code

This is my code after editing:

Integer servo1 = 5117;
Byte data1;
data1 = (((byte)servo1) >> 6 & (byte)0xFF);

What if I want to add a byte inside a byte array is it possible?

This is the code:

send = {(byte)0xE1, data1, data2, data3};

Now the error is showing Integer cannot be converted to Byte Can I know how to solve this problem. Thanks

Kon · Accepted Answer · 2015-06-26 01:25:48Z

2

Your syntax is not quite right. You want to cast the whole expression on the right side to byte if you want to assign it to that variable type. So use this:

    Integer servo1 = 5117;
    Byte data1;
    data1 = (byte) ((servo1) >> 6 & 0xFF);

You may be interested in the Java article on type conversions (specifically the section on integer promotions): https://docs.oracle.com/javase/specs/jls/se7/html/jls-5.html

answered Jun 26, 2015 at 1:25

Kon

10.8k6 gold badges46 silver badges60 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

raaj5671 Over a year ago

Just to confirm will my value changed? Example 0xFF should be 255 if its converted to integer. So the value still will show 255 or -255 something. Because sometime for instance if i use 0xC6 i should get 198 but sometimes i get -57 if i am not mistaken. Btw thanks for you answer @Kon it helped me to solve my problem for now ...

Kon Over a year ago

Any integer value cast to a byte will rollover. It will never have a value greater than that max value defined for byte. Make sure you test thoroughly what you're doing. This is pretty messy in my opinion.

afzalex · Accepted Answer · 2015-06-26 02:06:12Z

The error you are getting is **Integer** cannot be converted to **Byte**. It is because explicit conversion between numerical values cannot be done by their Wrapper classes. By (byte)servo1 you are trying to convert a Integer i.e. a wrapper class of int into byte i.e. a primitive type.

Consider the following example :

Long l = 10000000L;
Integer i = (int) l;     // Long cannot be converted to int
Byte b = (byte) i;       // Integer cannot be converted to byte

To do conversion between wrapper classes you should use methods provided by them :

Long l = 10000000L;
Integer i = l.intValue();
Byte b = i.byteValue();

And to do conversion between primitive primitive type you can do it explicitly as you were trying to do with wrapper classes :

long l = 1000000L;
int i = (int) l;
byte b = (byte) b;

That means your conversion would have worked if you have used primitive types :

int servo1 = 5117;
byte data1;
data1 = (((byte)servo1) >> 6 & (byte)0xFF);

Or if you have used correct method to convert wrapper classes you were using :

Integer servo1 = 5117;
Byte data1;
data1 = (byte)(servo1.byteValue() >> 6 & (byte) 0xFF);

@raaj5671 You should ask one question in one post. By the way what is the type of send. And if it is Byte[] it will not give any error and will work fine.
I hope you understand why you were getting error while converting. @raaj5671 , And another thing is you don't need to add @afzalex to notify a person on whose post you are commenting, he will be notified automatically.

Collectives™ on Stack Overflow

Int cannot be converted to bytes using java

2 Answers 2

2 Comments

3 Comments

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

2 Comments

3 Comments

Related