package com.jmethods.test;

public class Calculator {

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

}

package com.jmethods.test;

public class Calculator {

	private Calculator() {
		// Do nothing
	}

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

}

Hide the constructor