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To test if two objects point to the same space in memory, you can use the equals mthod of the Object class.
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To test if two objects store the same data, you can override the equals method in the subclass.
Override the equals method of the Object class.
public boolean equals(Object object) { if (object instance of Product) { Product product = (Product) object; if (code.equals(product2.getCode()) return true; } return false;}