**class u
        {
                public static void main(String as[])
                  {
                      int a,b,c,d;
                      a=Integer.parseInt(as[0]);
                      b=Integer.parseInt(as[1]);
                      c=Integer.parseInt(as[2]);
                      d=Integer.parseInt(as[3]);
                  if(a>b)
                   {
                     if(a>c)
                        {
                          if(a>d)
                            {
                             System.out.println("a is greater");
                            }
                        else if(d>b)
                              {
                                 if(d>c)
                                  {
                                     System.out.println("d is greater");
                                  }
                                 else
                                  {
                                     System.out.println("c is greater");
                                  }
                              }
                            else
                                  {
                                     System.out.println("b is greater");
                                  }
                         }
                      else if(c>b)
                        {
                         if(c>d)
                           { 
                              System.out.println("c is greater");
                           }

                          else if(d>a)
                             {
                                if(d>b)
                                  {

                                    System.out.println("d is greater");
                                  }
                                else
                                 {
                                   System.out.println("c is greater");
                                 }
                             }
                            else
                             {
                                System.out.println("c is greater");
                             }
                        }
                       }
                      else if(b>c)
                         {
                             if(b>d)
                               {
                                 System.out.println("b is greater");
                               }
                             else if(d>b)
                                 {
                                   if(d>c)
                                     {
                                        System.out.println("d is greater");
                                      }
                                    else
                                    {
                                      System.out.println("b is greater");
                                    }
                                  }
                               else
                                 {
                                    System.out.println("b is greater");
                                 }
                         }
                       else if(c>d)
                          {
                           if(c>a)
                              {
                                 System.out.println("c is greater");
                              }
                           else
                             {
                                System.out.println("c is greater");
                             }
                           }
                         else
                           {
                              System.out.println("d is greater");
                           }
                      }

                }**

import java.util.*;
class  FindLargest{
    public static void main(String[] args){
        int max = Integer.MIN_VALUE;
        System.out.println("Enter 4 numbers:");
        Scanner input=new Scanner(System.in);

        for(int i=1;i<=4;i++){
            int num=input.nextInt();
            if (num > max) {
                max = num;
               }
         }
        System.out.println("Largest Number is: "+max);
    }
}

thanks for give to short coding for this question but my friend first anwser for clearly understand a if else condition(NESTED IF CONDITION)