Higher-order means that now it is possible to pass the values as well as functions in the Methods same we can return both values and function from the methods.

Example: public void show(String name, Function function){ }

public Function createNewThing(Integer int)

package com.evon;
public class Time {

        public String toSeconds(int sec) {
                return "time is in " + sec ;
        }

        public String toMinutes(int minute) {
                return "time is in" + minute;
        }

        public String toHours(int hrs) {
                return "time  is in " + hrs;
        }
}

Now the below code can show To pass function Inside the Methods:

package com.evon;
import java.util.function.Function;
public class Print {

        public void print(int weight, Function<Integer, String> time) {
                System.out.println("Print: " + scale.apply(time));
        }

        public static void main(String[] args) {
                Print send = new Print();
               Time time = new Time();

                send.print(65, time::toSeconds);

                send.print(65, time::toMinutes);

                send.print(65, time::toHours);

        }
}

Function means that this function will accept an Integer and will return a String.

time::toHours means that the method toHours of the time instance will be called.