Java Hash Code Calculate hashCode(Object obj)

Description

Gets the hash code of an object returning zero when the object is null.

 ObjectUtils.hashCode(null)   = 0 ObjectUtils.hashCode(obj)    = obj.hashCode() 

License

Apache License

Parameter

Parameter	Description
obj	the object to obtain the hash code of, may be <code>null</code>

Return

the hash code of the object, or zero if null

Declaration

public static int hashCode(Object obj) 

Method Source Code

//package com.java2s;

public class Main {
    /**//  w  ww  .  j av a2 s  . c  o  m
     * <p>Gets the hash code of an object returning zero when the
     * object is <code>null</code>.</p>
     *
     * <pre>
     * ObjectUtils.hashCode(null)   = 0
     * ObjectUtils.hashCode(obj)    = obj.hashCode()
     * </pre>
     *
     * @param obj  the object to obtain the hash code of, may be <code>null</code>
     * @return the hash code of the object, or zero if null
     * @since 2.1
     */
    public static int hashCode(Object obj) {
        return (obj == null) ? 0 : obj.hashCode();
    }
}

Related

1. hashCode(Object o)
2. hashCode(Object o1, Object o2)
3. hashCode(Object obj)
4. hashCode(Object obj)
5. hashcode(Object obj)
6. hashCode(Object obj)
7. hashCode(Object obj)
8. hashCode(Object object)
9. hashCode(Object object)