java8-tutorial/src/com/winterbe/java8/Interface1.java at master · AhmedSalameh/java8-tutorial · GitHub

35 lines (27 loc) · 746 Bytes

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);

}

Expand file tree