将 Long 数转换为字节数组

Question

I am trying to convert a long number (convertex from Hex to Long) to a byte array. I'm trying the following code:

    ByteBuffer b = ByteBuffer.allocate(4);
    // The literal 4328719365 of type int is out of range 
    b.putLong(4328719365);
    byte[] result = b.array();

but it's not compiling due to being out of range for int .

What can I do to solve this issue?

Answer 1

Suffix L (or l ) converts literal number to a long .

So try this:

b.putLong(4328719365L);

You can use literal long value just like number without L suffix. Like assign them to variables:

long myLongValue = 4328719365L;
b.putLong(myLongValue);

Answer 2

1) Suffix L to the value 2) Increase the ByteBuffer allocated size and try 3) Int will take max of 10 digits and putLong might internally add L and making it beyond 10. Please check reducing digits in number.