32位二进制IP地址与十进制IP地址互相转换

代码：

 import java.util.List;
 import java.util.ArrayList;
 import java.util.Scanner;
 public class Transformation {
   public static void main(String[] args)throws Exception {
               String a;
               boolean b;
                 Scanner in=new Scanner(System.in);  

                     System.out.println("请输入IP地址或32位2进制数");
                     a=in.next();
                     if((b=a.matches("\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}"))) {
                     System.out.println("IP地址转2进制");
                         String[] array = a.split("\\.");
                   /*  for ( int i=0; i < array.length; i++) {
                             System.out.println(array[i]);
                             }*/
                         int[] intTemp = new int[array.length];
                         for (int i=0; i <array.length; i++)
                             {
                             intTemp[i] = Integer.parseInt(array[i]);
                             }
                         for (int i=0;i<intTemp.length ;i++)
                         {
                             int c =intTemp[i];
                             String binaryString = Integer.toBinaryString(c);//
                             int binaryInt = Integer.parseInt(binaryString);//
                             System.out.print(String.format("%08d",binaryInt));//
                         }
                }
                     else if(b=a.matches("\\d{32}")) {
                     System.out.println("2进制转iP地址");
                  /*
                      for(int i = 0; i < a.length(); i++){
                          arr[i] = a.substring(0,8);
                          result.add(tmp)
                          a= a.substring(8);
                         // System.out.println(arr[i]);*/
                          List<String> result = new ArrayList<String>();
                             int iPos = 0;
                             int iLen = a.length();
                             while(iLen>=8){
                                 String tmp = a.substring(0, 8);
                                 result.add(tmp);
                                 a= a.substring(8);
                                 iLen = a.length();
                             }
                             for(String st:result){

                                 System.out.print(Integer.parseInt(st,2));

                                 System.out.print(".");

                             }

                          }

                     else {
                     System.out.println("非法的输入！！！！"); 

                 }
             }  

         }