convert String into int without using parse

 public class test1 {

    public static void main(String[] args) {
        String abc = "123";
        int t=0;

        char arr1[] = abc.toCharArray();

        for(int i=0;i<arr1.length;i++){
            t = t*10 + (arr1[i]-'0');
        }
        System.out.println(t);
    }

}

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