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package com.winterbe.java8;

/**

* @author Benjamin Winterberg

*/

public class Interface1 {

interface Formula {

double calculate(int a);

default double sqrt(int a) {

return Math.sqrt(positive(a));

}

static int positive(int a) {

return a > 0 ? a : 0;

}

}

public static void main(String[] args) {

Formula formula1 = new Formula() {

@Override

public double calculate(int a) {

return sqrt(a * 100);

}

};

formula1.calculate(100); // 100.0

formula1.sqrt(-23); // 0.0

Formula.positive(-4); // 0.0

// Formula formula2 = (a) -> sqrt( a * 100);

}

}