OnJava8-Examples/generics/Mixins.java at master · CSapprenticeWT/OnJava8-Examples · GitHub

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// generics/Mixins.java

// We make no guarantees that this code is fit for any purpose.

// Visit http://OnJava8.com for more book information.

import java.util.*;

interface TimeStamped { long getStamp(); }

class TimeStampedImp implements TimeStamped {

private final long timeStamp;

TimeStampedImp() {

timeStamp = new Date().getTime();

}

@Override

public long getStamp() { return timeStamp; }

}

interface SerialNumbered { long getSerialNumber(); }

class SerialNumberedImp implements SerialNumbered {

private static long counter = 1;

private final long serialNumber = counter++;

@Override

public long getSerialNumber() { return serialNumber; }

}

interface Basic {

void set(String val);

String get();

}

class BasicImp implements Basic {

private String value;

@Override

public void set(String val) { value = val; }

@Override

public String get() { return value; }

}

class Mixin extends BasicImp

implements TimeStamped, SerialNumbered {

private TimeStamped timeStamp = new TimeStampedImp();

private SerialNumbered serialNumber =

new SerialNumberedImp();

@Override public long getStamp() {

return timeStamp.getStamp();

}

@Override public long getSerialNumber() {

return serialNumber.getSerialNumber();

}

public class Mixins {

public static void main(String[] args) {

Mixin mixin1 = new Mixin(), mixin2 = new Mixin();

mixin1.set("test string 1");

mixin2.set("test string 2");

System.out.println(mixin1.get() + " " +

mixin1.getStamp() + " " +

mixin1.getSerialNumber());

System.out.println(mixin2.get() + " " +

mixin2.getStamp() + " " +

mixin2.getSerialNumber());

}

/* Output:

test string 1 1611503367257 1

test string 2 1611503367258 2

OnJava8-Examples/generics/Mixins.java at master · CSapprenticeWT/OnJava8-Examples · GitHub

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