B4J Question Get value out from bit 0 to 2 (3 bits in a byte)

Dim inline as JavaObject
....
    inline=Me
    Dim value As Int = 23
    '    params =  Value,bit start, bit end (inclusive)
    Log(inline.RunMethod("getBits",Array(value,0,2)))
    Log(inline.RunMethod("getBits",Array(value,3,5)))
....
#if java
public static byte getBits(int v,int st,int end){
    byte res = 0;
    for(int a=st;a<=end;a++){
        res += (byte)(1<<a);
    }
    return (byte)((res & v)>>st);
}
#end if

...
    Log(getBits(value,0,2))
    Log(getBits(value,4,6))
...
Sub getBits(v As Int,bitStart As Int,bitEnd As Int) As Int
    Dim res As Int = 0
    For a = bitStart To bitEnd
        res = res + Power(2,a)      
    Next
    Return (Bit.ShiftRight(Bit.And(v,res),bitStart))
End Sub

Sub GetBits(v As Int,bitStart As Int,bitEnd As Int) As Byte
   Dim i1 As Int = Bit.And(Bit.ShiftLeft(v, 7 - bitEnd), 0xff)
   Return Bit.UnsignedShiftRight(i1, bitStart + 7 - bitEnd)
End Sub