implementing equal and hashcode method im detail

Question

Dhaval · Accepted Answer

public class HashingMechanism {
	private int num;
	private String data;
	
	
	
	public boolean equals(Object obj)
	{
		if(obj==null)
		{
			return false;
		}
		if(this == null)
		{
			return false;
		}
		
		HashingMechanism hashingMechanism = new HashingMechanism();
		return num == hashingMechanism.num &&
				(data == hashingMechanism.data || (data != null && data.equals(hashingMechanism.data)));
	}
	
	
	public int hashcode()
	{
		int hash = 7;
		hash = 31 * hash + num;
		hash = 31 * hash + (null == data ? 0 : data.hashCode());
		return hash;
	}
}

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