How do I change date formatting symbols?

By Wayan in Core API, Text Package 0 Comment

This example shows how we can change the date formatting symbols. In this example we change the month names and short month names and also the weekday names and short weekday names.

Other than these two items we can also change other symbols such as the Era name and AM-PM string.

package org.kodejava.text;

import java.text.SimpleDateFormat;
import java.text.DateFormat;
import java.text.DateFormatSymbols;
import java.util.Date;

public class DateFormatSymbolsExample {
    public static void main(String[] args) {
        // Defining a new Date Format Symbols, the following are month and day
        // names in Bahasa Indonesia.
        String[] newMonths = {"JANUARI", "FEBRUARI", "MARET", "APRIL", "MEI",
                "JUNI", "JULI", "AGUSTUS", "SEPTEMBER", "OKTOBER", "NOVEMBER",
                "DESEMBER"};
        String[] newShortMonths = {"JAN", "FEB", "MAR", "APR", "MEI", "JUN",
                "JUL", "AGU", "SEP", "OKT", "NOV", "DES"};
        String[] newWeekdays = {"", "MINGGU", "SENIN", "SELASA", "RABU", "KAMIS",
                "JUMAT", "SABTU"};
        String[] shortWeekdays = {"", "MIN", "SEN", "SEL", "RAB", "KAM", "JUM",
                "SAB"};

        DateFormatSymbols symbols = new DateFormatSymbols();
        symbols.setMonths(newMonths);
        symbols.setShortMonths(newShortMonths);
        symbols.setWeekdays(newWeekdays);
        symbols.setShortWeekdays(shortWeekdays);

        DateFormat format = new SimpleDateFormat("dd MMMM yyyy", symbols);
        System.out.println(format.format(new Date()));

        format = new SimpleDateFormat("dd MMM yyyy", symbols);
        System.out.println(format.format(new Date()));

        format = new SimpleDateFormat("EEEE, dd MMM yyyy", symbols);
        System.out.println(format.format(new Date()));

        format = new SimpleDateFormat("E, dd MMM yyyy", symbols);
        System.out.println(format.format(new Date()));
    }
}

The result of the code snippet above is:

02 OKTOBER 2021
02 OKT 2021
SABTU, 02 OKT 2021
SAB, 02 OKT 2021

How do I do bitwise exclusive OR operation?

By Wayan in Basic, Core API 0 Comment 
package org.kodejava.lang;

public class XorDemo {
    public static void main(String[] args) {
        int numberA = 16;
        int numberB = 32;

        // Operator ^ is used for doing bitwise exclusive OR operation
        int result = numberA ^ numberB;

        System.out.println(numberA + " ^ " + numberB + " = " + result);

        // Print the result in binary format
        System.out.println(Integer.toBinaryString(numberA) +
                " ^ " + Integer.toBinaryString(numberB) +
                " = " + Integer.toBinaryString(result));
    }
}

The program prints the following output:

16 ^ 32 = 48
10000 ^ 100000 = 110000

How do I do bitwise OR operation?

By Wayan in Basic, Core API 0 Comment 
package org.kodejava.lang;

public class OrDemo {
    public static void main(String[] args) {
        int numberA = 16;
        int numberB = 4;

        // Operator "|" is used for doing bitwise OR operation
        int result = numberA | numberB;

        System.out.println(numberA + " | " + numberB + " = " + result);

        // Print the result in binary format
        System.out.println(Integer.toBinaryString(numberA) +
                " | " + Integer.toBinaryString(numberB) +
                " = " + Integer.toBinaryString(result));
    }
}

The result of the code snippet:

16 | 4 = 20
10000 | 100 = 10100

How do I do bitwise AND operation?

By Wayan in Basic, Core API 0 Comment 
package org.kodejava.lang;

public class AndDemo {
    public static void main(String[] args) {
        int numberA = 16;
        int numberB = 16;

        // Operator "&"  is used for doing bitwise AND operation
        int result = numberA & numberB;

        System.out.println(numberA + " & " + numberB + " = " + result);

        // Print the result in binary format
        System.out.println(Integer.toBinaryString(numberA) +
                " & " + Integer.toBinaryString(numberB) +
                " = " + Integer.toBinaryString(result));
    }
}

The result of the code snippet:

16 & 16 = 16
10000 & 10000 = 10000

How do I prevent bean’s property being serialized to XML?

By Wayan in Beans 0 Comment 
package org.kodejava.bean;

import java.beans.*;
import java.io.BufferedOutputStream;
import java.io.FileOutputStream;
import java.io.FileNotFoundException;

public class BeanToXmlTransient {
    private Long id;
    private String itemName;
    private String itemColour;
    private Integer itemQuantities;

    static {
        try {
            // In this block will change the attribute type of the 
            // itemQuantities to transient, so it will be not serialized 
            // to xml when we use XMLEncode to convert the bean to xml 
            // persistence.
            BeanInfo bi = Introspector.getBeanInfo(BeanToXmlTransient.class);
            PropertyDescriptor[] pds = bi.getPropertyDescriptors();
            for (PropertyDescriptor propertyDescriptor : pds) {
                if (propertyDescriptor.getName().equals("itemQuantities")) {
                    propertyDescriptor.setValue("transient", Boolean.TRUE);
                }
            }
        } catch (IntrospectionException e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        BeanToXmlTransient bean = new BeanToXmlTransient();
        bean.setId(1L);
        bean.setItemName("T-Shirt");
        bean.setItemColour("Dark Red");
        bean.setItemQuantities(100);

        try {
            XMLEncoder encoder = new XMLEncoder(new BufferedOutputStream(
                    new FileOutputStream("BeanTransient.xml")));

            // Write an XML representation of the specified object to the 
            // output.
            encoder.writeObject(bean);
            encoder.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getItemName() {
        return itemName;
    }

    public void setItemName(String itemName) {
        this.itemName = itemName;
    }

    public String getItemColour() {
        return itemColour;
    }

    public void setItemColour(String itemColour) {
        this.itemColour = itemColour;
    }

    public Integer getItemQuantities() {
        return itemQuantities;
    }

    public void setItemQuantities(Integer itemQuantities) {
        this.itemQuantities = itemQuantities;
    }
}

Here will see the the itemQuantities property is not serialized to XML.

<?xml version="1.0" encoding="UTF-8"?>
<java version="17" class="java.beans.XMLDecoder">
 <object class="org.kodejava.bean.BeanToXmlTransient">
  <void property="id">
   <long>1</long>
  </void>
  <void property="itemColour">
   <string>Dark Red</string>
  </void>
  <void property="itemName">
   <string>T-Shirt</string>
  </void>
 </object>
</java>