Java Tutorial/Apache Common/NumberUtils

NumberUtils.compare

import org.apache.rumons.lang.math.NumberUtils;
public class MainClass {
    public static void main(String[] args) {
        //Compare two double values
        System.out.println("(FIRST > SECOND) >>> " +
            NumberUtils.rupare(2.11, 1.11));
        System.out.println("(FIRST < SECOND) >>> " +
            NumberUtils.rupare(1.11, 2.11));
        System.out.println("(FIRST == SECOND) >>> " +
            NumberUtils.rupare(1.11, 1.11));
    }
}

(FIRST > SECOND) >>> 1
(FIRST < SECOND) >>> -1
(FIRST == SECOND) >>> 0

NumberUtils.createBigDecimal

import java.math.BigDecimal;
import org.apache.rumons.lang.math.NumberUtils;
public class MainClass {
    public static void main(String[] args) {
      //Create a BigDecimal from a String
      BigDecimal bDecimal = NumberUtils.createBigDecimal("123456789");
      System.out.println(bDecimal);
    }
}

123456789

NumberUtils.isDigits

import org.apache.rumons.lang.math.NumberUtils;
public class MainClass {
    public static void main(String[] args) {
      //Check if a String contains only digits
      System.out.println("Is Digits >>> " + NumberUtils.isDigits("123.123"));

    }
}

123456789

NumberUtils.isNumber

import org.apache.rumons.lang.math.NumberUtils;
public class MainClass {
    public static void main(String[] args) {
      //Check if a String is a valid number
      System.out.println("Is Number >>> " + NumberUtils.isNumber("123.123"));
    }
}

Is Number >>> true

NumberUtils.max

import org.apache.rumons.lang.math.NumberUtils;
public class MainClass {
    public static void main(String[] args) {

      //Get MAX value from an array 
      System.out.println("MAX >>> " +
          NumberUtils.max(new double[] { 3.33, 8.88, 1.11 }));

    }
}

Is Number >>> true

NumberUtils.toInt

import org.apache.rumons.lang.math.NumberUtils;
public class MainClass {
    public static void main(String[] args) {
      //Convert String to int. If value invalid, return default value.
      System.out.println("String to Int >>> " +
          NumberUtils.toInt("ABCD", 77));

    }
}

String to Int >>> 77