/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* Provides extra functionality for Java Number classes.
*
* @author Rand McNeely
* @author Stephen Colebourne
* @author Steve Downey
* @author Eric Pugh
* @author Phil Steitz
* @author Matthew Hawthorne
* @author Gary Gregory
* @author Fredrik Westermarck
* @since 2.0
* @version $Id: NumberUtils.java 609475 2008-01-06 23:58:59Z bayard $
*/
public class Main {
/**
* Compares two floats for order.
*
* This method is more comprehensive than the standard Java greater than,
* less than and equals operators.
*
* - It returns
-1 if the first value is less than the second.
* - It returns
+1 if the first value is greater than the second.
* - It returns
0 if the values are equal.
*
*
* The ordering is as follows, largest to smallest:
*
* - NaN
* - Positive infinity
* - Maximum float
* - Normal positive numbers
* - +0.0
* - -0.0
* - Normal negative numbers
* - Minimum float (
-Float.MAX_VALUE)
* - Negative infinity
*
*
* Comparing NaN with NaN will return
* 0.
*
* @param lhs the first float
* @param rhs the second float
* @return -1 if lhs is less, +1 if greater,
* 0 if equal to rhs
*/
public static int compare(float lhs, float rhs) {
if (lhs < rhs) {
return -1;
}
if (lhs > rhs) {
return +1;
}
//Need to compare bits to handle 0.0 == -0.0 being true
// compare should put -0.0 < +0.0
// Two NaNs are also == for compare purposes
// where NaN == NaN is false
int lhsBits = Float.floatToIntBits(lhs);
int rhsBits = Float.floatToIntBits(rhs);
if (lhsBits == rhsBits) {
return 0;
}
//Something exotic! A comparison to NaN or 0.0 vs -0.0
//Fortunately NaN's int is > than everything else
//Also negzeros bits < poszero
//NAN: 2143289344
//MAX: 2139095039
//NEGZERO: -2147483648
if (lhsBits < rhsBits) {
return -1;
} else {
return +1;
}
}
}