How to use java to complete the Product of numbers

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An n-digit number is called all-digit if it contains all the numbers 1 to n exactly once; for example, the five-digit number 15234 is all-digit from 1 to 5.

7254 is a special product because in the equation 39 × 186 = 7254, the multiplicand, multiplier, and product are exactly all digits from 1 to 9.

Find all multiplicative equations where the multiplicand, multiplier, and product are exactly all numbers from 1 to 9, and find the sum of the products in these equations.

Note: Some products may be obtained from multiple multiplication equations, but are calculated only once in the summation.

System.out.println(LargeSum());

Analysis:

The number is too large, obviously not enough with int or long type, calculated with BigInteger, and then truncated.

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