Java examples for java.lang:Number
Checks if the given number is positive or 0, that is >= 0.
//package com.java2s; import java.math.BigDecimal; import java.math.BigInteger; public class Main { public static void main(String[] argv) throws Exception { Number value = new Integer(2); System.out.println(isPositiveOrZero(value)); }/*from w w w . ja v a 2 s .com*/ /** * Checks if the given number is positive or 0, that is >= 0. * @param value The value to check * @return True is value is not null and its value >= 0. */ public static boolean isPositiveOrZero(Number value) { boolean isPositiveOrZero = false; if (value != null) { if (BigDecimal.class.isAssignableFrom(value.getClass())) { isPositiveOrZero = (((BigDecimal) value) .compareTo(BigDecimal.ZERO) >= 0); } else if (BigInteger.class.isAssignableFrom(value.getClass())) { isPositiveOrZero = (((BigInteger) value) .compareTo(BigInteger.ZERO) >= 0); } else { isPositiveOrZero = (value.doubleValue() >= 0); } } return isPositiveOrZero; } /** * Checks if the Class of the given object is assignable from a reference * Class. * @param value The object to check. * @param clazz The reference Class. * @return True if value, it's Class and clazz are not null and value is * assignable from clazz; false otherwise. */ public static boolean isAssignableFrom(Object value, Class clazz) { return isAssignableFrom((value != null) ? value.getClass() : (Class) null, clazz); } /** * Checks if the given Class is assignable from a reference Class. * @param value The Class to check. * @param clazz The reference Class. * @return True if value and clazz are not null and value is assignable from * clazz; false otherwise. */ @SuppressWarnings("unchecked") public static boolean isAssignableFrom(Class value, Class clazz) { return (clazz != null) && (value != null) && clazz.isAssignableFrom(value); // unchecked } }