functional interface in java 8 example
@FunctionalInterface
interface Square
{
int calculate(int x);
}
class Test
{
public static void main(String args[])
{
int a = 5;
// lambda expression to define the calculate method
Square s = (int x)->x*x;
// parameter passed and return type must be
// same as defined in the prototype
int ans = s.calculate(a);
System.out.println(ans);
}
}How many static methods can an interface have?
package com.journaldev.java8.staticmethod;
public interface MyData {
default void print(String str) {
if (!isNull(str))
System.out.println("MyData Print::" + str);
}
static boolean isNull(String str) {
System.out.println("Interface Null Check");
return str == null ? true : "".equals(str) ? true : false;
}
}How many static methods can an interface have?
package com.journaldev.java8.staticmethod;
public class MyDataImpl implements MyData {
public boolean isNull(String str) {
System.out.println("Impl Null Check");
return str == null ? true : false;
}
public static void main(String args[]){
MyDataImpl obj = new MyDataImpl();
obj.print("");
obj.isNull("abc");
}
}Copyright © 2021 Codeinu
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