java

Question

The program will keep asking the user to insert a number until he writes "stop" or "Stop" then the loop will break and the sum of the numbers he'd inserted will be printed out. Questions are how to convert a whole list of strings to integers and how can i get the sum of the numbers in the list.
i came this far:

import java.util.ArrayList;
import java.util.Scanner;

public class loopStop {
public static void main(String[] args) {
while(true) {
ArrayList<String> choices = new ArrayList<>() ;
System.out.println("\nInsert a number!");
Scanner x = new Scanner(System.in);
String inp = x.nextLine() ;
choices.add(inp) ;
if(inp.equals("stop")){
break;
for(String a : choices){
System.out.println((int)a);
}
}

}
}
}

Answer 1

Lenoname

Add try catch block when you add in list

https://code.sololearn.com/cDz7p1oh3W7k/?ref=app

Answer 2

Lenoname

Simple make list of Integer

Convert input values to integer when Input is not 'stop' or 'Stop'

Add converted input to list

Answer 3

Lenoname

Also there are some correction in your code

Make Scanner object outside while loop

Use equalsIgnoreCase method

Declare and Initialise list outside the loop

--------

import java.util.*;

public class LoopStop {
public static void main(String[] args) {
List<Integer> choices = new ArrayList<>();

System.out.println("Insert a number!");

Scanner x = new Scanner(System.in);

while(true) {

String inp = x.nextLine();

if(inp.equalsIgnoreCase("stop"))
break;
choices.add(Integer.parseInt(inp));
}

int sum = 0;

for(Integer i : choices)
sum += i;

System.out.print(sum);
}
}

Answer 4

now choices.add() wont accept a string to the list of integers

import java.util.ArrayList;
import java.util.Scanner;

public class loopStop {
public static void main(String[] args) {
while(true) {
ArrayList<Integer> choices = new ArrayList<>() ;
System.out.println("\nInsert a number!");
Scanner x = new Scanner(System.in);
String inp = x.nextLine() ;
choices.add(inp) ;<----------new problem
if(inp.equals("stop")){
break;
}
else if(!inp.equals("stop")){

}
}
}
}

Answer 5

import java.util.ArrayList;
import java.util.Scanner;

public class loopStop {
public static void main(String[] args) {
ArrayList<Integer> choices = new ArrayList<>() ;
Scanner x = new Scanner(System.in);
while(true) {
System.out.println("\nInsert a number!");
String inp = x.nextLine() ;
if(inp.equalsIgnoreCase("stop")){
break;
choices.add(Integer.parseInt(inp)) ;<-------------says"java: incompatible types: java.lang.String cannot be converted to java.lang.Integer"
}
int sum = 0 ;
for(Integer i : choices){
sum += i ;
System.out.println(sum);
}
}
}
}