math.utils

Class EqualUtils

java.lang.Object

math.utils.EqualUtils

public final class EqualUtils
extends java.lang.Object

Collected methods which allow easy implementation of equals. Rewritten from http://www.javapractices.com/topic/TopicAction.do?Id=17. Example use case in a class called Car:

public boolean equals(Object aThat){
  if ( this == aThat ) return true;
  if ( !(aThat instanceof Car) ) return false;
  Car that = (Car)aThat;
  return
    EqualsUtil.areEqual(this.name, that.name) &&
    EqualsUtil.areEqual(this.numDoors, that.numDoors) &&
    EqualsUtil.areEqual(this.gasMileage, that.gasMileage) &&
    EqualsUtil.areEqual(this.color, that.color) &&
    Arrays.equals(this.maintenanceChecks, that.maintenanceChecks); //array!
}
 

Arrays are not handled by this class. This is because the Arrays.equals methods should be used for array fields.

Constructor Summary

Constructors

Constructor and Description
EqualUtils()

Method Summary

Modifier and Type	Method and Description
static boolean	areEqual(boolean aThis, boolean aThat)
static boolean	areEqual(char aThis, char aThat)
static boolean	areEqual(double aThis, double aThat)
static boolean	areEqual(float aThis, float aThat)
static boolean	areEqual(long aThis, long aThat)
static boolean	areEqual(java.lang.Object aThis, java.lang.Object aThat) Possibly-null object field.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

EqualUtils

public EqualUtils()

Method Detail

areEqual

public static boolean areEqual(boolean aThis,
                               boolean aThat)

areEqual

public static boolean areEqual(char aThis,
                               char aThat)

areEqual

public static boolean areEqual(long aThis,
                               long aThat)

areEqual

public static boolean areEqual(float aThis,
                               float aThat)

areEqual

public static boolean areEqual(double aThis,
                               double aThat)

areEqual

public static boolean areEqual(java.lang.Object aThis,
                               java.lang.Object aThat)

Possibly-null object field. Includes type-safe enumerations and collections, but does not include arrays. See class comment.