Check each bit in the byte array with Java?

So I have a byte array, and I have a function to check whether the nth least significant bit index of the byte array is 1 or 0 If the bit is 1, it returns true. If the bit is false, the least significant bit of the byte array is defined as the last significant bit in the 0th index of the byte array, and the most significant bit of the byte array is defined as (the most significant bit in the byte array) Length – 1) index of byte array

For example,

byte[] myArray = new byte[2];
byte[0] = 0b01111111;
byte[1] = 0b00001010;

call:

myFunction(0) = true;
myFunction(1) = true;
myFunction(7) = false;
myFunction(8) = false;
myFunction(9) = true;
myFunction(10) = false;
myFunction(11) = true;

What's the best way to do this?

thank you!

Solution

You can use this method:

public boolean isSet(byte[] arr,int bit) {
    int index = bit / 8;  // Get the index of the array for the byte with this bit
    int bitPosition = bit % 8;  // Position of this bit in a byte

    return (arr[index] >> bitPosition & 1) == 1;
}

Bit% 8 is the bit position relative to the byte Arr [index] > > bit% 8 moves the bit at the index to the 0 position