Java by API/java.text/NumberFormat

NumberFormat: format(Object obj)

 
/*
4096.251 parses as 4096.251 and formats as 4,096.251
 */
import java.text.NumberFormat;
import java.text.ParseException;
public class MainClass {
  public static void main(String[] av) {
    String input = "4096.251";
    NumberFormat defForm = NumberFormat.getInstance();
    try {
      Number d = defForm.parse(input);
      System.out.println(input + " parses as " + d + " and formats as " + defForm.format(d));
    } catch (ParseException pe) {
      System.err.println(input + "not parseable!");
    }
  }
}

NumberFormat.getCurrencyInstance();

  

import java.text.NumberFormat;
public class Mortgage {
  public static void main(String[] args) {
    double payment = Math.random() * 1000;
    System.out.println("Your payment is ");
    NumberFormat nf = NumberFormat.getCurrencyInstance();
    System.out.println(nf.format(payment));
  }
}

NumberFormat: getCurrencyInstance(Locale.UK)

 
import java.awt.FlowLayout;
import java.awt.Font;
import java.text.Format;
import java.text.NumberFormat;
import java.util.Locale;
import javax.swing.BoxLayout;
import javax.swing.JFormattedTextField;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
public class MainClass {
  public static void main(String args[]) throws Exception {
    JFrame frame = new JFrame("Number Input");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    Font font = new Font("SansSerif", Font.BOLD, 16);
    JLabel label;
    JFormattedTextField input;
    JPanel panel;
    BoxLayout layout = new BoxLayout(frame.getContentPane(), BoxLayout.Y_AXIS);
    frame.setLayout(layout);
    Format currency = NumberFormat.getCurrencyInstance(Locale.UK);
    label = new JLabel("UK Currency:");
    input = new JFormattedTextField(currency);
    input.setValue(2424.50);
    input.setColumns(20);
    input.setFont(font);
    panel = new JPanel(new FlowLayout(FlowLayout.RIGHT));
    panel.add(label);
    panel.add(input);
    frame.add(panel);
    frame.pack();
    frame.setVisible(true);
  }
}

NumberFormat: getInstance()

 
import java.awt.FlowLayout;
import java.awt.Font;
import java.text.Format;
import java.text.NumberFormat;
import java.util.Locale;
import javax.swing.BoxLayout;
import javax.swing.JFormattedTextField;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
public class MainClass {
  public static void main(String args[]) throws Exception {
    JFrame frame = new JFrame("Number Input");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    Font font = new Font("SansSerif", Font.BOLD, 16);
    JLabel label;
    JFormattedTextField input;
    JPanel panel;
    BoxLayout layout = new BoxLayout(frame.getContentPane(), BoxLayout.Y_AXIS);
    frame.setLayout(layout);
    Format general = NumberFormat.getInstance();
    label = new JLabel("General/Instance:");
    input = new JFormattedTextField(general);
    input.setValue(2424.50);
    input.setColumns(20);
    input.setFont(font);
    panel = new JPanel(new FlowLayout(FlowLayout.RIGHT));
    panel.add(label);
    panel.add(input);
    frame.add(panel);
    frame.pack();
    frame.setVisible(true);
  }
}

NumberFormat: getIntegerInstance(Locale.ITALIAN)

 
import java.awt.FlowLayout;
import java.awt.Font;
import java.text.Format;
import java.text.NumberFormat;
import java.util.Locale;
import javax.swing.BoxLayout;
import javax.swing.JFormattedTextField;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
public class MainClass {
  public static void main(String args[]) throws Exception {
    JFrame frame = new JFrame("Number Input");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    Font font = new Font("SansSerif", Font.BOLD, 16);
    JLabel label;
    JFormattedTextField input;
    JPanel panel;
    BoxLayout layout = new BoxLayout(frame.getContentPane(), BoxLayout.Y_AXIS);
    frame.setLayout(layout);
    Format integer = NumberFormat.getIntegerInstance(Locale.ITALIAN);
    label = new JLabel("Italian integer:");
    input = new JFormattedTextField(integer);
    input.setValue(2424.50);
    input.setColumns(20);
    input.setFont(font);
    panel = new JPanel(new FlowLayout(FlowLayout.RIGHT));
    panel.add(label);
    panel.add(input);
    frame.add(panel);
    frame.pack();
    frame.setVisible(true);
  }
}

NumberFormat: getNumberInstance()

 
/*Output: 
 * User"s number (DEFAULT LOCALE): 1,976.083
 * */

import java.text.NumberFormat;
public class MainClass {
  public static void main(String args[]) throws Exception {
    NumberFormat numberFormat = NumberFormat.getInstance();
    numberFormat.setParseIntegerOnly(false);
    double usersNumber = 1976.0826;
    numberFormat = NumberFormat.getNumberInstance();
    System.out.println("User"s number (DEFAULT LOCALE): " + numberFormat.format(usersNumber));
    
  }
}

NumberFormat: getNumberInstance(Locale.FRENCH)

 
import java.awt.FlowLayout;
import java.awt.Font;
import java.text.Format;
import java.text.NumberFormat;
import java.util.Locale;
import javax.swing.BoxLayout;
import javax.swing.JFormattedTextField;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
public class MainClass {
  public static void main(String args[]) throws Exception {
    JFrame frame = new JFrame("Number Input");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    Font font = new Font("SansSerif", Font.BOLD, 16);
    JLabel label;
    JFormattedTextField input;
    JPanel panel;
    BoxLayout layout = new BoxLayout(frame.getContentPane(), BoxLayout.Y_AXIS);
    frame.setLayout(layout);
    Format number = NumberFormat.getNumberInstance(Locale.FRENCH);
    label = new JLabel("French Number:");
    input = new JFormattedTextField(number);
    input.setValue(2424.50);
    input.setColumns(20);
    input.setFont(font);
    panel = new JPanel(new FlowLayout(FlowLayout.RIGHT));
    panel.add(label);
    panel.add(input);
    frame.add(panel);
    frame.pack();
    frame.setVisible(true);
  }
}

NumberFormat: getNumberInstance(Locale inLocale)

 

/*Output: 
 * User"s number (US): 1,976.083
 * */

import java.text.NumberFormat;
import java.util.Locale;
public class MainClass {
  public static void main(String args[]) throws Exception {
    NumberFormat numberFormat = NumberFormat.getInstance();
    numberFormat.setParseIntegerOnly(false);
    double usersNumber = 1976.0826;
    numberFormat = NumberFormat.getNumberInstance(Locale.US);
    System.out.println("User"s number (US): " + numberFormat.format(usersNumber));
    
  }
}

NumberFormat: getPercentInstance(Locale inLocale)

  

import java.text.NumberFormat;
import java.util.Locale;
public class Main {
  public static void main(String[] argv) throws Exception {
    Number number = NumberFormat.getPercentInstance(Locale.CANADA).parse("123.45%");
    // 1.2345
    if (number instanceof Long) {
      System.out.println("Long value");
    } else {
      System.out.println("Double value");
    }
  }
}

NumberFormat: parse(String source)

 
/*
4096.251 parses as 4096.251 and formats as 4,096.251
 */
import java.text.NumberFormat;
import java.text.ParseException;
public class MainClass {
  public static void main(String[] av) {
    String input = "4096.251";
    NumberFormat defForm = NumberFormat.getInstance();
    try {
      Number d = defForm.parse(input);
      System.out.println(input + " parses as " + d + " and formats as " + defForm.format(d));
    } catch (ParseException pe) {
      System.err.println(input + "not parseable!");
    }
  }
}

NumberFormat.setMaximumFractionDigits(int newValue)

 
/*
0.0 formats as 000.00
1.0 formats as 001.00
3.142857142857143 formats as 003.1429
100.2345678 formats as 100.2346
 */
import java.text.NumberFormat;
public class MainClass {
  public static void main(String[] av) {
    double data[] = { 0, 1, 22d / 7, 100.2345678 };
    NumberFormat form = NumberFormat.getInstance();
    // Set it to look like 999.99[99]
    form.setMinimumIntegerDigits(3);
    form.setMinimumFractionDigits(2);
    form.setMaximumFractionDigits(4);
    // Now print using it.
    for (int i = 0; i < data.length; i++)
      System.out.println(data[i] + "\tformats as " + form.format(data[i]));
  }
}

NumberFormat: setMinimumFractionDigits(int newValue)

 
/*
0.0 formats as 000.00
1.0 formats as 001.00
3.142857142857143 formats as 003.1429
100.2345678 formats as 100.2346
 */
import java.text.NumberFormat;
public class MainClass {
  public static void main(String[] av) {
    double data[] = { 0, 1, 22d / 7, 100.2345678 };
    NumberFormat form = NumberFormat.getInstance();
    // Set it to look like 999.99[99]
    form.setMinimumIntegerDigits(3);
    form.setMinimumFractionDigits(2);
    form.setMaximumFractionDigits(4);
    // Now print using it.
    for (int i = 0; i < data.length; i++)
      System.out.println(data[i] + "\tformats as " + form.format(data[i]));
  }
}

NumberFormat: setMinimumIntegerDigits(int newValue)

 
/*
0.0 formats as 000.00
1.0 formats as 001.00
3.142857142857143 formats as 003.1429
100.2345678 formats as 100.2346
 */
import java.text.NumberFormat;
public class MainClass {
  public static void main(String[] av) {
    double data[] = { 0, 1, 22d / 7, 100.2345678 };
    NumberFormat form = NumberFormat.getInstance();
    // Set it to look like 999.99[99]
    form.setMinimumIntegerDigits(3);
    form.setMinimumFractionDigits(2);
    form.setMaximumFractionDigits(4);
    // Now print using it.
    for (int i = 0; i < data.length; i++)
      System.out.println(data[i] + "\tformats as " + form.format(data[i]));
  }
}

NumberFormat: setParseIntegerOnly(boolean value)

 

/*Output: 
 * User"s number (US): 1,976.083
 * */

import java.text.NumberFormat;
import java.util.Locale;
public class MainClass {
  public static void main(String args[]) throws Exception {
    NumberFormat numberFormat = NumberFormat.getInstance();
    numberFormat.setParseIntegerOnly(false);
    double usersNumber = 1976.0826;
    numberFormat = NumberFormat.getNumberInstance(Locale.US);
    System.out.println("User"s number (US): " + numberFormat.format(usersNumber));
    
  }
}