Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;

public class Main {
    /**
     * This method is a helper for classes to implement {@link java.lang.Object#equals(java.lang.Object)}
     * The method checks whether the two arguments are both null or both not null and
     * whether they are of the same class
     * @param obj1 first object to compare
     * @param obj2 second object to compare
     * @return true if both objects are null or both are not null
     * and if both are of the same class if not null
     * false otherwise
     * 
     * source from: https://github.com/apache/pig/blob/89c2e8e76c68d0d0abe6a36b4e08ddc56979796f/src/org/apache/pig/impl/util/Utils.java
     */
    public static boolean checkNullAndClass(Object obj1, Object obj2) {
        if (checkNullEquals(obj1, obj2, false)) {
            if (obj1 != null) {
                return obj1.getClass() == obj2.getClass();
            } else {
                return true; // both obj1 and obj2 should be null
            }
        } else {
            return false;
        }
    }

    /**
     * This method is a helper for classes to implement {@link java.lang.Object#equals(java.lang.Object)}
     * checks if two objects are equals - two levels of checks are
     * made - first if both are null or not null. If either is null,
     * check is made whether both are null.
     * If both are non null, equality also is checked if so indicated
     * @param obj1 first object to be compared
     * @param obj2 second object to be compared
     * @param checkEquality flag to indicate whether object equality should
     * be checked if obj1 and obj2 are non-null
     * @return true if the two objects are equal
     * false otherwise
     * 
     * source from: https://github.com/apache/pig/blob/89c2e8e76c68d0d0abe6a36b4e08ddc56979796f/src/org/apache/pig/impl/util/Utils.java
     */
    public static boolean checkNullEquals(Object obj1, Object obj2, boolean checkEquality) {
        if (obj1 == null || obj2 == null) {
            return obj1 == obj2;
        }
        if (checkEquality) {
            if (!obj1.equals(obj2)) {
                return false;
            }
        }
        return true;
    }
}