런타임 오류가 뜨던데 어디서 틀렸나요??
~~ java
ackage alog;

import java.util.Scanner;

public class AAA {

public static   String[] ar = new String[20]; 
static int st = 0;
public static void Select(String ar,String ar2){
    if(ar.matches(".*[+].*"))
    {
        String temp,temp2;

        int len =0;
        len = ar.length();
        int i = ar.indexOf("+");
        temp = ar.substring(0, i);
        temp2 = ar.substring(i+1, len);
        Toint(temp,temp2,ar2,"+");
    }
    if(ar.matches(".*[-].*"))
    {
        String temp,temp2;

        int len =0;
        len = ar.length();
        int i = ar.indexOf("-");
        temp = ar.substring(0, i);
        temp2 = ar.substring(i+1, len);
        Toint(temp,temp2,ar2,"-");
    }
    if(ar.matches(".*[*].*"))
    {
        String temp,temp2;

        int len =0;
        len = ar.length();
        int i = ar.indexOf("*");
        temp = ar.substring(0, i);
        temp2 = ar.substring(i+1, len);
        Toint(temp,temp2,ar2,"*");
    }
    if(ar.matches(".*[/].*"))
    {
        String temp,temp2;

        int len =0;
        len = ar.length();
        int i = ar.indexOf("/");
        temp = ar.substring(0, i);
        temp2 = ar.substring(i+1, len);
        Toint(temp,temp2,ar2,"/");
    }

}
public static void Toint(String par1,String par2,String presult,String idx)
{

    int ar1 = 0,ar2=0;  
    int result=0;
    String i;
    int sum =0;
    String Checking="No";

    if(par1.equals("zero")){
        ar1 = 0;
    }
    if(par1.equals("one")){
        ar1 = 1;
    }
    if(par1.equals("two")){
        ar1 = 2;
    }
    if(par1.equals("three")){
        ar1 = 3;
    }
    if(par1.equals("four")){
        ar1 = 4;
    }
    if(par1.equals("five")){
        ar1 = 5;
    }
    if(par1.equals("six")){
        ar1 = 6;
    }
    if(par1.equals("seven")){
        ar1 = 7;
    }
    if(par1.equals("eight")){
        ar1 = 8;
    }
    if(par1.equals("nine")){
        ar1 = 9;
    }
    if(par1.equals("ten")){
        ar1 = 10;
    }
    if(par2.equals("zero")){
        ar2 = 0;
    }
    if(par2.equals("one")){
        ar2 = 1;
    }
    if(par2.equals("two")){
        ar2 = 2;
    }
    if(par2.equals("three")){
        ar2 = 3;
    }
    if(par2.equals("four")){
        ar2 = 4;
    }
    if(par2.equals("five")){
        ar2 = 5;
    }
    if(par2.equals("six")){
        ar2 = 6;
    }
    if(par2.equals("seven")){
        ar2 = 7;
    }
    if(par2.equals("eight")){
        ar2 = 8;
    }
    if(par2.equals("nine")){
        ar2 = 9;
    }
    if(par2.equals("ten")){
        ar2 = 10;
    }

    if(presult.equals("zero")){
        result = 0;
    }
    if(presult.equals("one")){
        result = 1;
    }
    if(presult.equals("two")){
        result = 2;
    }
    if(presult.equals("three")){
        result = 3;
    }
    if(presult.equals("four")){
        result = 4;
    }
    if(presult.equals("five")){
        result = 5;
    }
    if(presult.equals("six")){
        result = 6;
    }
    if(presult.equals("seven")){
        result = 7;
    }
    if(presult.equals("eight")){
        result = 8;
    }
    if(presult.equals("nine")){
        result = 9;
    }
    if(presult.equals("ten")){
        result = 10;
    }




    switch(idx)
    {

        case "+":{
            sum = ar1+ar2;
            if(sum==result)
            {
                Checking="Yes";
                ar[st] = Checking;
                st++;
            }
            else
            {
                Checking="No";
                ar[st] = Checking;
                st++;
            }
            break;
        }
        case "-":{
            sum = ar1-ar2;
            if(sum==result)
            {
                Checking="Yes";
                ar[st] = Checking;
                st++;
            }
            else
            {
                Checking="No";
                ar[st] = Checking;
                st++;
            }
            break;
        }
        case "*":{
            sum = ar1*ar2;
            if(sum==result)
            {
                Checking="Yes";
                ar[st] = Checking;
                st++;
            }
            else
            {
                Checking="No";
                ar[st] = Checking;
                st++;
            }
            break;
        }
        case "/":{
            sum = ar1/ar2;
            if(sum==result)
            {
                Checking="Yes";
                ar[st] = Checking;
                st++;

            }
            else
            {
                Checking="No";
                ar[st] = Checking;
                st++;
            }
            break;
        }
    }

}
public static void main(String[] args) {
    // TODO Auto-generated method stub
    Scanner scanner = new Scanner(System.in);


    int T =0;
    int j ,k;
    String sp;
    String[] temp = {""};
    String[] temp2 = {""};
    T = scanner.nextInt();
    for(int a = 0;a<T;a++)
    {
        sp = scanner.next();
        temp = sp.split("=");
        Select(temp[0],temp[1]);
    }
    for(j=0;j<st;j++)
    {
        System.out.println(ar[j]);
    }

}

}
~~~