How do I reverse a string, words or sentences?

By Wayan in Apache Commons, Commons Lang 0 Comment 
package org.kodejava.commons.lang;

import org.apache.commons.lang3.StringUtils;

public class StringReverseDemo {
    public static void main(String[] args) {
        // We have an original string here that we'll need to reverse.
        String words = "The quick brown fox jumps over the lazy dog";

        // Using StringUtils.reverse we can reverse the string letter by letter.
        String reversed = StringUtils.reverse(words);

        // Now we want to reverse per word, we can use
        // StringUtils.reverseDelimited() method to do this.
        String delimitedReverse = StringUtils.reverseDelimited(words, ' ');

        // Print out the result
        System.out.println("Original: " + words);
        System.out.println("Reversed: " + reversed);
        System.out.println("Delimited Reverse: " + delimitedReverse);
    }
}

Here is the result:

Original: The quick brown fox jumps over the lazy dog
Reversed: god yzal eht revo spmuj xof nworb kciuq ehT
Delimited Reverse: dog lazy the over jumps fox brown quick The

Maven Dependencies

<dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-lang3</artifactId>
    <version>3.14.0</version>
</dependency>

Maven Central

How do I check if a string is empty or not?

By Wayan in Apache Commons, Commons Lang 0 Comment 
package org.kodejava.commons.lang;

import org.apache.commons.lang3.StringUtils;

public class EmptyStringCheckDemo {
    public static void main(String[] args) {
        // Create some variable to hold some empty string, contains only
        // whitespaces and words.
        String one = "";
        String two = "\t\r\n";
        String three = "     ";
        String four = null;
        String five = "four four two";

        // We can use StringUtils class for checking if a string is empty or not
        // using StringUtils.isBlank() method. This method will return true if
        // the tested string is empty, contains whitespaces only or null.
        System.out.println("Is one empty? " + StringUtils.isBlank(one));
        System.out.println("Is two empty? " + StringUtils.isBlank(two));
        System.out.println("Is three empty? " + StringUtils.isBlank(three));
        System.out.println("Is four empty? " + StringUtils.isBlank(four));
        System.out.println("Is five empty? " + StringUtils.isBlank(five));

        // On the other side, the StringUtils.isNotBlank() methods complement
        // the previous method. It will check if a tested string is not empty.
        System.out.println("Is one not empty? " + StringUtils.isNotBlank(one));
        System.out.println("Is two not empty? " + StringUtils.isNotBlank(two));
        System.out.println("Is three not empty? " + StringUtils.isNotBlank(three));
        System.out.println("Is four not empty? " + StringUtils.isNotBlank(four));
        System.out.println("Is five not empty? " + StringUtils.isNotBlank(five));
    }
}

Here is the result:

Is one empty? true
Is two empty? true
Is three empty? true
Is four empty? true
Is five empty? false
Is one not empty? false
Is two not empty? false
Is three not empty? false
Is four not empty? false
Is five not empty? true

Maven Dependencies

<dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-lang3</artifactId>
    <version>3.14.0</version>
</dependency>

Maven Central

How do I convert Date to String?

By Wayan in Core API, Text Package 1 Comment 
package org.kodejava.text;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
import java.util.Calendar;
import java.util.Date;

public class DateToString {
    public static void main(String[] args) {
        // Create an instance of SimpleDateFormat used for formatting
        // the string representation of date (day/month/year)
        String pattern = "dd/MM/yyyy";
        DateFormat df = new SimpleDateFormat(pattern);

        // Get the date today using Calendar object.
        Date today = Calendar.getInstance().getTime();

        // Using DateFormat format method we can create a string
        // representation of a date with the defined format.
        String reportDate = df.format(today);

        // Print what date is today!
        System.out.println("Report Date: " + reportDate);

        // Using Java 8.
        // Creates a DateTimeFormatter using the ofPattern() method. Get
        // the current date by calling the .now() method of LocalDate.
        // To convert to string use the format() method of the LocalDate
        // and pass the formatter object as argument.
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern(pattern);
        LocalDate now = LocalDate.now();
        reportDate = now.format(formatter);
        System.out.println("Report Date: " + reportDate);
    }
}

How do I get day of week?

By Wayan in Core API, Util Package 0 Comment

In this example we want to create a calendar or date from a year and day of the year. Next we will find out what day-of-week that calendar or date represent. In the code snippet below we are trying to find the 180 day of the year 2021.

Let’s see the example below.

package org.kodejava.util;

import java.text.DateFormatSymbols;
import java.util.Calendar;

public class DayOfYearToDayOfWeekExample {
    public static void main(String[] args) {
        // Create a calendar with year and day of year.
        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.YEAR, 2021);
        calendar.set(Calendar.DAY_OF_YEAR, 180);

        // See the full information of the calendar object.
        System.out.println(calendar.getTime().toString());

        // Get the weekday and print it
        int weekday = calendar.get(Calendar.DAY_OF_WEEK);
        System.out.println("Weekday: " + weekday);

        // Get weekday name
        DateFormatSymbols dfs = new DateFormatSymbols();
        System.out.println("Weekday: " + dfs.getWeekdays()[weekday]);
    }
}

Below is the result of our program.

Tue Jun 29 06:04:21 CST 2021
Weekday: 3
Weekday: Tuesday

How do I convert Array to Collection?

By Wayan in Core API, Util Package 0 Comment 
package org.kodejava.util;

import java.util.Arrays;
import java.util.List;

public class ArrayToListExample {
    public static void main(String[] args) {
        // Creates an array of object, in this case we create an
        // Integer array.
        Integer[] numbers = {1, 1, 2, 3, 5, 8, 13, 21, 34, 55};

        // Convert the created array above to collection, in this
        // example we convert it to a List.
        List<Integer> list = Arrays.asList(numbers);

        // We've got a list of our array here and iterate it.
        for (Integer number : list) {
            System.out.print(number + ", ");
        }
    }
}