why not using regular expression.

my code:
            if ("0+0=0".equals(line.trim())) {
                System.out.println("True");
                break;
            }
            
            String[] t = line.split("[+=]");
            
            int n1 = Integer.parseInt(new StringBuffer(t[0]).reverse().toString());
            int n2 = Integer.parseInt(new StringBuffer(t[1]).reverse().toString());
            int n3 = Integer.parseInt(new StringBuffer(t[2]).reverse().toString());
            
            
            if (n1 + n2 == n3) {
                System.out.println("True");
            } else {
                System.out.println("False");
            }