Clever Geek Handbook

Skip characters / numbers in JAVA

How to skip a number or character that is the same for two numbers or characters from each other while those characters / numbers exist in a string of numbers or word

example (not lists):

I want to skip the number 3 (in any position) when I am counting from 2 to 14

the result will be

2,4,5,6,7,8,9,10,11,12,14

the other will skip the number 31 in any combination where 3 and 1 come out if both exist

these two examples apply to symbols as well.

What I was doing was

for(int i = startingNum; i <= endingNum; i++){
    if(i "has a" 3){
        skip number;
    }
    else{
        counter++;
    }
}

combination of numbers

for(int i = startingNum; i <= endingNum; i++){
    if((i "has a" 3) AND (i "has a " 1)){
        skip number;
    }
    else{
        counter++;
    }
}

in the symbol I am completely lost ...

+3


source to share


2 answers


One way is to convert the number to a string and check if that number contains as a substring:



for(int i = startingNum; i <= endingNum; i++) {
    if (!String.valueOf(i).contains("3")) { // Here
        counter++;
    }
}
+2


source


One approach is to use the parsing results, for example:

public static Integer isParsable(String text) {
  try {
    return Integer.parseInt(text);
  } catch (NumberFormatException e) {
    return null;
  }
}

...
import java.io.IOException;

public class NumChecker {

    static String[] str = new String[]{"2", "4", "a", "sd", "d5", "6", "7", "8", "a1", "3", "10", "11", "12", "14"};
    static int startingNum = 2;
    static int endingNum = 10;
    static int counter = 0;
    static int mark = 3;

    public static Integer isParsable(String text) {
        try {
            return Integer.parseInt(text);
        } catch (NumberFormatException e) {
            return null;
        }
    }

    public static void main(String[] args) throws IOException {
        for (int i = startingNum; i <= endingNum; i++) {
            Integer num = isParsable(str[i]);
            if (num != null) {
                if (num == mark) {
                    counter++;
                }
            }
        }
        System.out.println(counter);
    }
}


OUTPUT:

1
+2


source






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