Create a Product validation system using a simple Product class with SKU and Price fields. Write a static method called isValid that validates the Product object's SKU format (SKU-XXXX-ZZ) and ensures the Price is positive.
Examples
Input: Product__c p = new Product__c(SKU__c = 'SKU-1234-AB', Price__c = 50.00);
Output: true
Explanation: The SKU and price are valid.
Input: Product__c p = new Product__c(SKU__c = 'INVALID-SKU', Price__c = 50.00);
Output: false
Explanation: The SKU format is invalid.
Input: Product__c p = new Product__c(SKU__c = 'SKU-1234-AB', Price__c = -10.00);
Output: false
Explanation: The price is invalid.
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