Java Language Tutorial => Implement hashCode() method

Example

To implement the hashCode method of an object easily you could use the HashCodeBuilder class.

Selecting the fields:

@Override
public int hashCode() {
    
    HashCodeBuilder builder = new HashCodeBuilder();
    builder.append(field1);
    builder.append(field2);
    builder.append(field3);
    
    return builder.hashCode();
}

Using reflection:

@Override
public int hashCode() {
    return HashCodeBuilder.reflectionHashCode(this, false);
}

the boolean parameter indicates if it should use transient fields.

Using reflection avoiding some fields:

@Override
public int hashCode() {
    return HashCodeBuilder.reflectionHashCode(this, "field1", "field2");
}

PDF - Download Java Language for free

Previous Next

Java Language

Fastest Entity Framework Extensions

Example

Got any Java Language Question?

Java Language

Java Language Apache Commons Lang Implement hashCode() method

Fastest Entity Framework Extensions

Example

Got any Java Language Question?