Object Oriented Programming tentang "Komunikasi antar objek" dimana ada 4 metode dasar, diantaranya 1) Direct, 2) Injection, 3) Interface, 4) Adapter

Contoh1.java

package app;

class Charger {
    public int getElectricity() {
        return 10;
    }
}

class Handphone {
    private Charger charger = new Charger();
    private Integer battery = 0;

    public void charge() {
        this.battery = this.battery + this.charger.getElectricity();
    }

    public int checkBatteryStatus() {
        return this.battery;
    }
}

public class Contoh1 {
    public static void main(String[] args) {
        Handphone hp = new Handphone();

        while (hp.checkBatteryStatus() < 100) {
            System.out.print("Mengisi daya...");
            System.out.println(hp.checkBatteryStatus());
            hp.charge();
        }

        System.out.print("Selesai...");
        System.out.println(hp.checkBatteryStatus());
    }
}

Contoh2.java

package app;

class ChargerSamsung {
    public int streamElectricity() {
        return 5;
    }
}

class ChargerASUS {
    public int getElectricity() {
        return 10;
    }
}

// ========================================================================

class Handphone {
    private ChargerASUS charger = null;
    private Integer battery = 0;

    public void setCharger(ChargerASUS charger) {
        this.charger = charger;
    }

    public void charge() {
        this.battery = this.battery + this.charger.getElectricity();
    }

    public int checkBatteryStatus() {
        return this.battery;
    }
}

public class Contoh2 {
    public static void main(String[] args) {
        ChargerASUS charger = new ChargerASUS();
        // ChargerSamsung charger = new ChargerSamsung();
        Handphone hp = new Handphone();

        hp.setCharger(charger);

        while (hp.checkBatteryStatus() < 100) {
            System.out.print("Mengisi daya...");
            System.out.println(hp.checkBatteryStatus());
            hp.charge();
        }

        System.out.print("Selesai...");
        System.out.println(hp.checkBatteryStatus());
    }
}

Contoh3.java

package app;

interface ConnectorUSBC {
    public int supplyElectricity();
}

class ChargerXiaomi implements ConnectorUSBC {
    public int supplyElectricity() {
        return 20;
    }
}

// ========================================================================

interface ConnectorUSB2 {
    public int getElectricity();
}

class ChargerSamsung implements ConnectorUSB2 {
    public int getElectricity() {
        return 5;
    }
}

class ChargerASUS implements ConnectorUSB2 {
    public int getElectricity() {
        return 10;
    }
}

// ========================================================================

class Handphone {
    private ConnectorUSB2 charger = null;
    private Integer battery = 0;

    public void setCharger(ConnectorUSB2 charger) {
        this.charger = charger;
    }

    public void charge() {
        this.battery = this.battery + this.charger.getElectricity();
    }

    public int checkBatteryStatus() {
        return this.battery;
    }
}

public class Contoh3 {
    public static void main(String[] args) {
        // ChargerXiaomi charger = new ChargerXiaomi();
        // ChargerASUS charger = new ChargerASUS();
        ChargerSamsung charger = new ChargerSamsung();
        Handphone hp = new Handphone();

        hp.setCharger(charger);

        while (hp.checkBatteryStatus() < 100) {
            System.out.print("Mengisi daya...");
            System.out.println(hp.checkBatteryStatus());
            hp.charge();
        }

        System.out.print("Selesai...");
        System.out.println(hp.checkBatteryStatus());
    }
}

Contoh4.java

package app;

interface ConnectorUSBC {
    public int supplyElectricity();
}

class ChargerXiaomi implements ConnectorUSBC {
    public int supplyElectricity() {
        return 20;
    }
}

// ========================================================================

interface ConnectorUSB2 {
    public int getElectricity();
}

class ChargerSamsung implements ConnectorUSB2 {
    public int getElectricity() {
        return 5;
    }
}

class ChargerASUS implements ConnectorUSB2 {
    public int getElectricity() {
        return 10;
    }
}

// ========================================================================

class AdapterUSBCtoUSB2 implements ConnectorUSB2 {
    private ConnectorUSBC charger = null;

    public void setCharger(ConnectorUSBC charger) {
        this.charger = charger;
    }

    public int getElectricity() {
        return this.charger.supplyElectricity();
    }
}

// ========================================================================

class Handphone {
    private ConnectorUSB2 charger = null;
    private Integer battery = 0;

    public void setCharger(ConnectorUSB2 charger) {
        this.charger = charger;
    }

    public void charge() {
        this.battery = this.battery + this.charger.getElectricity();
    }

    public int checkBatteryStatus() {
        return this.battery;
    }
}

public class Contoh4 {
    public static void main(String[] args) {
        ChargerXiaomi charger = new ChargerXiaomi();
        AdapterUSBCtoUSB2 adapter = new AdapterUSBCtoUSB2();

        adapter.setCharger(charger);

        // ChargerASUS charger = new ChargerASUS();
        // ChargerSamsung charger = new ChargerSamsung();

        Handphone hp = new Handphone();

        hp.setCharger(adapter);
        // hp.setCharger(charger);

        while (hp.checkBatteryStatus() < 100) {
            System.out.print("Mengisi daya...");
            System.out.println(hp.checkBatteryStatus());
            hp.charge();
        }

        System.out.print("Selesai...");
        System.out.println(hp.checkBatteryStatus());
    }
}