Java by API/java.text/DecimalFormat

DecimalFormat: applyPattern(String pattern)

 
import java.text.DecimalFormat;
import java.text.NumberFormat;
public class MainClass {
  public static void main(String[] argv) {
    double d = 1234567.89;
    double n = -1234567.89;
    String pattern = "#,###.##;(#,###.##)";
    NumberFormat nf = NumberFormat.getInstance();
    if (nf instanceof DecimalFormat) {
      DecimalFormat df = (DecimalFormat) nf;
      df.applyPattern(pattern);
      System.out.println(df.format(d));
      System.out.println(df.format(n));
    }
  }
}

DecimalFormat: getDecimalFormatSymbols()

 

import java.awt.Font;
import java.text.DecimalFormat;
import java.text.DecimalFormatSymbols;
import java.text.NumberFormat;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
public class Main extends JPanel {
  public Main() {
    DecimalFormat df = (DecimalFormat) NumberFormat.getInstance();
    DecimalFormatSymbols dfs = df.getDecimalFormatSymbols();
    dfs.setZeroDigit("\u0660");
    df.setDecimalFormatSymbols(dfs);
    JLabel label = new JLabel(df.format(1234567.89));
    label.setFont(new Font("Lucida Sans", Font.PLAIN, 22));
    add(label);
  }
  public static void main(String[] argv) {
    JFrame frame = new JFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.getContentPane().add("Center", new Main());
    frame.pack();
    frame.setVisible(true);
  }
}

DecimalFormat: setDecimalFormatSymbols(DecimalFormatSymbols newSymbols)

 
import java.awt.Font;
import java.text.DecimalFormat;
import java.text.DecimalFormatSymbols;
import java.text.NumberFormat;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
public class MainClass extends JPanel {
  public MainClass() {
    NumberFormat nf = NumberFormat.getInstance();
    if (nf instanceof DecimalFormat) {
      DecimalFormat df = (DecimalFormat) nf;
      DecimalFormatSymbols dfs = df.getDecimalFormatSymbols();
      // set the beginning of the range to Arabic digits
      dfs.setZeroDigit("\u0660");
      df.setDecimalFormatSymbols(dfs);
    }
    JLabel label = new JLabel(nf.format(1234567.89));
    label.setFont(new Font("Lucida Sans", Font.PLAIN, 22));
    add(label);
  }
  public static void main(String[] argv) {
    MainClass panel = new MainClass();
    JFrame frame = new JFrame("Arabic Digits");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.getContentPane().add("Center", panel);
    frame.pack();
    frame.setVisible(true);
  }
}