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);//1111
                            int binaryInt = Integer.parseInt(binaryString);//1111
                            System.out.print(String.format("%08d",binaryInt));//00001111
                        }
               }
                    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！！！！"); 
        
                }
            }  
  
        }