Simon Leung

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What does the following code mean ?What does "^" represent ? @Override &nbsp; &nbsp; public int hashCode() { &nbsp; &nbsp; &nbsp; &nbsp; return ( &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; (this.getPartNumber()==null?0:this.getPartNumber().hashCode()) &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ^ &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ((int) this.getRevision()) &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ); &nbsp; &nbsp; } Beside, what doesthe highlighted code below mean ? @Override &nbsp; &nbsp; public boolean equals(Object otherOb) { &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; if (this == otherOb) { &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; return true; &nbsp; &nbsp; &nbsp; &nbsp; } &nbsp; &nbsp; &nbsp; &nbsp; if (!(otherOb instanceof PartKey)) { &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; return false; &nbsp; &nbsp; &nbsp; &nbsp; } &nbsp; &nbsp; &nbsp; &nbsp; PartKey other = (PartKey) otherOb; &nbsp; &nbsp; &nbsp; &nbsp; return ( &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; (this.getPartNumber()==null?other.getPartNumber()==null:this.getPartNumber().equals(other.getPartNumber())) &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &amp;&amp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; (getRevision() == other.getRevision()) &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ); &nbsp; &nbsp; }
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What does the following code mean ?What does "^" represent ?
@Override
    public int hashCode() {
        return (
                (this.getPartNumber()==null?0:this.getPartNumber().hashCode())
                ^
                ((int) this.getRevision())
                );
    }
Beside, what doesthe highlighted code below mean ?
@Override
    public boolean equals(Object otherOb) {
       
        if (this == otherOb) {
            return true;
        }
        if (!(otherOb instanceof PartKey)) {
            return false;
        }
        PartKey other = (PartKey) otherOb;
        return (
                (
this.getPartNumber()==null?other.getPartNumber()==null:this.getPartNumber().equals(other.getPartNumber()))
                &&
                (getRevision() == other.getRevision())
                );
    }

JEE Code query

Java Enterprise Edition (Java EE) is a specification defining a collection of Java-based server and client technologies and how they interoperate. Java EE specifies server and client architectures and uses profiles to define technology sets targeted at specific classes of applications. All Java EE profiles share a set of common features, such as naming and resource injection, packaging rules and security requirements.