Answer:
Here is code in java.
import java.util.*;
 
class Main
{
  // main method of the class
 public static void main (String[] args) throws java.lang.Exception
 {
    try{
         // print the running total of all inputs
        System.out.println("total of all the inputs is: "+fun());
        
    }catch(Exception ex){
        return;}
 }
 
 /* function to take input from user until input is -1
  and keep a running total */
 public static int fun()
 {
     int in;
      //scanner class object to read the input 
     Scanner scr=new Scanner(System.in);
      // variable to keep running total
     int total=0;
     System.out.println("please enter an Integer:(-1 to stop)");
      // read the input first time
     in=scr.nextInt();
     while(in!=-1)
     { 
      // this loop keep taking input until input is -1.
      // calculate running total of all inputs
         total=total+in;
         System.out.println("please enter an number:(-1 to stop)::");
         in=scr.nextInt();
         
     }
      // return total of all inputs
     return total;
     
 }
 }
Explanation:
Create an object of scanner class in the method fun_tot(),it will take input from user.In while loop it will ask user to give input and calculate the sum of all inputs.when user enter -1 then while loop breaks and the method will return the total of all inputs given by the user.
Output:
please enter an number:(-1 to stop)::23
please enter an number:(-1 to stop)::3
please enter an number:(-1 to stop)::5
please enter an number:(-1 to stop)::76
please enter an number:(-1 to stop)::12
please enter an number:(-1 to stop)::-1
total of all the inputs is: 119