模拟一个简单的计算器，通过静态工具Tools，实现加减乘除的运算

好的，以下是一个简单的计算器的静态工具类的实现，包含加减乘除四种基本的运算：

public class Calculator {
    public static int add(int a, int b) {
        return a + b;
    }

    public static int subtract(int a, int b) {
        return a - b;
    }

    public static int multiply(int a, int b) {
        return a * b;
    }

    public static double divide(int a, int b) throws IllegalArgumentException {
        if (b == 0) {
            throw new IllegalArgumentException("Cannot divide by zero");
        }
        return (double) a / b;
    }
}

可以通过以下代码进行测试：

public static void main(String[] args) {
    int a = 10;
    int b = 5;

    System.out.println("a + b = " + Calculator.add(a, b));
    System.out.println("a - b = " + Calculator.subtract(a, b));
    System.out.println("a * b = " + Calculator.multiply(a, b));
    try {
        System.out.println("a / b = " + Calculator.divide(a, b));
    } catch (IllegalArgumentException e) {
        System.out.println(e.getMessage());
    }
}

输出结果为：

a + b = 15
a - b = 5
a * b = 50
a / b = 2.0