how to break a string into two parts in java-CodePudding

Let's assume a string consists of two parts, day and date.

String arr[] = { "Tuesday 8/11/22", "Monday 15/3/21", "Friday 20/5/21" };

How can I only print out the latter part (date part) on console?

CodePudding user response：

As long as the day and date will stay in that format you can use the split() function:

class DateSplit {
    public static void main(String[] args) {
        String a = "Tuesday 8/11/22";
        String[] result = a.split(" ");
        System.out.println(result[1]);
    }
}

where the delimiter splitting the string is the whitespace character.

CodePudding user response：

for(String str : arr) {
  System.out.println(str.split(" ")[1])
}

CodePudding user response：

public class Main {
            public static void main(String[] args) {
                String arr[] = { "Tuesday 8/11/22", "Monday 15/3/21", "Friday 20/5/21" };
            
            for(int count = 0; count < arr.length; count  ) {
                String[] s = arr[count].split(" ");
                System.out.println(s[1]);
            }
        }
    }

CodePudding user response：

I recommend you use the date-time API instead of performing string manipulation of the elements. The string manipulation will not give you all the benefits that you can get by the specialized date-time API.

Bonus

You get your dates validated free of cost e.g. one of your dates, Friday 20/5/21 is incorrect. This date was Thursday and the java.time API can perform this check for you automatically.

Demo:

import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
import java.time.format.TextStyle;
import java.util.Locale;

class Main {
    public static void main(String[] args) {
        String arr[] = { "Tuesday 8/11/22", "Monday 15/3/21", "Friday 20/5/21" };
        DateTimeFormatter parser = DateTimeFormatter.ofPattern("EEEE d/M/uu", Locale.ENGLISH);
        for (String s : arr) {
            LocalDate date = LocalDate.parse(s, parser);

            // Now you can get individual units from date in a variety of ways
            System.out.println(date.getDayOfWeek().getDisplayName(TextStyle.FULL, Locale.ENGLISH));
            System.out.println(date.getDayOfWeek().getDisplayName(TextStyle.SHORT, Locale.ENGLISH));
            System.out.println(date.getYear());

            // You can also format it in the desired ways
            DateTimeFormatter formatter = DateTimeFormatter.ofPattern("d/M/uu", Locale.ENGLISH);
            String formatted = date.format(formatter);
            System.out.println(formatted);
        }
    }
}

Output:

Tuesday
Tue
2022
8/11/22
Monday
Mon
2021
15/3/21
Exception in thread "main" java.time.format.DateTimeParseException: Text 'Friday 20/5/21' could not be parsed: Conflict found: Field DayOfWeek 4 differs from DayOfWeek 5 derived from 2021-05-20
        at java.base/java.time.format.DateTimeFormatter.createError(DateTimeFormatter.java:2023)

Learn more about the modern Date-Time API from Trail: Date Time.