Format a number with leading zeroes

    
 
import java.text.DecimalFormat;
import java.text.NumberFormat;

public class Main {
  public static void main(String[] args) {
    NumberFormat formatter = new DecimalFormat("0000000");
    String number = formatter.format(2500);

    System.out.println("Number with lading zeros: " + number);
  }
}

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Format a number with leading zeroes : Number Format « Data Type « Java

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