Math

One of the most "obvious" usages for static methods is when doing things that are math or math-like.

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

These sorts of methods have a result computed solely from their inputs, so needing an instance of a class to call them would be silly.

The Math class that comes with Java has methods that work in this way. Math.max(a, b) is static and therefore usable everywhere you want the maximum of two numbers.¹