I have the following method, where I am setting the value "9" in String. When I put this in byte and display the output then the value gets changed.
void method() {
String s = "9";
byte[] b = s.getBytes();
System.out.println("Byte value is: " + byte[0]);
}
Output:
Byte value is: 57
Here why is 9 getting converted to 57?
Because the character '9' is ASCII value 57:
https://www.cs.cmu.edu/~pattis/15-1XX/common/handouts/ascii.html
ASCII character 9 would be a "tab" character
parseByte method of the Byte class.57 is the ASCII code for the character '9'
when you trying to get byte value from character you get only ASCII value.
character '9' ASCII code is 57
In above example you need to correct the compilation problems first: It should code should be like :
System.out.println("Byte value is: " + b[0]);
And not
System.out.println("Byte value is: " + byte[0];
And regarding the output, You are assigning "9" as string and trying to fetch the byte[], basically getBytes encodes this String into a sequence of bytes using the platform's default charset, storing the result into a new byte array. hence your getting "57".
String.getBytes()does not do what you think it does. Read the API documentation.'9'is 57.