Java BigDecimal Precision Loss: Fix & Examples

In Java, using the BigDecimal class can help prevent the problem of precision loss in floating-point arithmetic. When performing numerical calculations with the BigDecimal class, it is necessary to use the methods provided by BigDecimal for operations and comparisons, rather than using operators directly.

Below is a sample code demonstrating how to use the BigDecimal class for accurate calculations:

import java.math.BigDecimal;

public class Main {
    public static void main(String[] args) {
        BigDecimal num1 = new BigDecimal("0.1");
        BigDecimal num2 = new BigDecimal("0.2");

        // 使用add方法进行加法运算
        BigDecimal sum = num1.add(num2);

        System.out.println("Sum: " + sum);
    }
}

In the example above, we used the BigDecimal class to initialize two values and performed addition using the add method, resulting in the correct outcome. By using the BigDecimal class, we can ensure that the precision of numerical calculations is not lost.