New features of JAVA8, binary sequence to decimal digits

 Packagekata_007_ binary sequence to decimal int;/*** java8 lambda expression convert binary sequence--decimal number*/Importjava.util.ArrayList; Public classShortbinarytodecimal { Public Static voidMain (string[] args) {ArrayList<Integer> binary =NewArrayList (); Binary.add (1); Binary.add (0); Binary.add (1); Binary.add (0); intresult =binarytodecimal (binary);    SYSTEM.OUT.PRINTLN (result); }         Public Static intBinarytodecimal (arraylist<integer>binary) {          returnBinary.stream (). Reduce ((x, y) x * 2 +y). get (); }}

If you are not using a lambda expression, use the traditional way:

 Packagekata_007_ binary sequence to decimal int;Importjava.awt.List;Importjava.util.ArrayList; Public classTestbinarytodecimal { Public Static voidMain (string[] args) {//test MethodArrayList binary =NewArrayList (); Binary.add (1); Binary.add (0); Binary.add (0); Binary.add (1); intresult =binarytodecimal (binary);    SYSTEM.OUT.PRINTLN (result); }         Public Static intBinarytodecimal (arraylist<integer>binary) {String Binarystr= "";  for(intI=0;i<binary.size (); i++) {Binarystr+=Binary.get (i); }        //String binary-string decimalString decimalstr = integer.valueof (binarystr,2). toString (); //String decimal-int        intDecimalresult =Integer.parseint (DECIMALSTR); returnDecimalresult; }}

New features of JAVA8, binary sequence to decimal digits