how to take binary input in java

1int binaryNumber = 0b1001;
2  
3  //binaryNumber == 9

1String input="1001010101010101";
2int len=input.length();
3BitSet bs=new BitSet(len);
4int i=len-1;
5for (char c:input.toCharArray()) 
6	bs.set(i--, c=='1'?true:false);