added lab7 ex1

src/lab7_state/ex1/Machine.java

@@ -0,0 +1,101 @@
+package lab7_state.ex1;
+
+import lab7_state.ex1.states.*;
+
+public class Machine {
+    private MachineState currentState;
+    private final MachineState offState;
+    private final MachineState idleState;
+    private final MachineState choiceState;
+    private final MachineState serviceNeededState;
+    private final MachineState coffeeReadyState;
+
+    private int cups;
+    private boolean jammed = false;
+
+    public Machine() {
+        offState = new OffState(this);
+        idleState = new IdleState(this);
+        choiceState = new ChoiceState(this);
+        serviceNeededState = new ServiceNeededState(this);
+        coffeeReadyState = new CoffeeReadyState(this);
+        currentState = offState;
+        this.setCups(3);
+    }
+
+    public MachineState getOffState() {
+        return offState;
+    }
+
+    public MachineState getIdleState() {
+        return idleState;
+    }
+
+    public MachineState getChoiceState() {
+        return choiceState;
+    }
+
+    public MachineState getServiceNeededState() {
+        return serviceNeededState;
+    }
+
+    public MachineState getCoffeeReadyState() {
+        return coffeeReadyState;
+    }
+
+    public void returnMoney(double value) {
+        System.out.println("Returning CHF " + value);
+    }
+
+    public void setCurrentState(MachineState currentState) {
+        System.out.println(this.currentState.toString() + " -> " + currentState);
+        this.currentState = currentState;
+    }
+
+    public void powerUp() {
+        currentState.powerUp();
+    }
+
+    public void insertCoin(double value) {
+        currentState.insertCoin(value);
+    }
+
+    public void returnCoin() {
+        currentState.returnCoin();
+    }
+
+    public void pushButton() {
+        currentState.pushButton();
+    }
+
+    public void resetButton() {
+        currentState.reset();
+    }
+
+    public void removeCup() {
+        currentState.removeCup();
+    }
+
+    public void setCups(int cups) {
+        this.cups = cups;
+    }
+
+    public boolean hasCups() {
+        return cups != 0;
+    }
+
+    public boolean hasCoffee() {
+        return true;
+    }
+
+    public boolean isJammed() {
+        return jammed;
+    }
+
+    public void makeCoffee() {
+        cups--;
+        if (Math.random() < 0.2) {
+            jammed = true;
+        }
+    }
+}

src/lab7_state/ex1/MachineState.java

@@ -0,0 +1,21 @@
+package lab7_state.ex1;
+
+public abstract class MachineState {
+    protected Machine machine;
+
+    public MachineState(Machine machine) {
+        this.machine = machine;
+    }
+
+    protected void powerUp() {}
+    protected void insertCoin(double value) {}
+    protected void returnCoin() {}
+    protected void reset() {}
+    protected void pushButton() {}
+    protected void removeCup() {}
+
+    @Override
+    public String toString() {
+        return getClass().getSimpleName();
+    }
+}

src/lab7_state/ex1/Main.java

@@ -0,0 +1,29 @@
+package lab7_state.ex1;
+
+public class Main {
+    public static void main(String[] args) {
+        Machine machine = new Machine();
+        System.out.println("A");
+        machine.powerUp();
+        machine.insertCoin(1);
+
+        System.out.println("B");
+        machine.insertCoin(0.25);
+        machine.returnCoin();
+
+        System.out.println("C");
+        machine.insertCoin(0.25);
+        machine.pushButton();
+        machine.removeCup();
+
+        for (int i = 0; i < 4; i++) {
+            System.out.println("D" + i);
+            machine.insertCoin(0.25);
+            machine.pushButton();
+            machine.removeCup();
+        }
+
+        System.out.println("E");
+        machine.resetButton();
+    }
+}

src/lab7_state/ex1/states/ChoiceState.java

@@ -0,0 +1,32 @@
+package lab7_state.ex1.states;
+
+import lab7_state.ex1.Machine;
+import lab7_state.ex1.MachineState;
+
+public class ChoiceState extends MachineState {
+    public ChoiceState(Machine machine) {
+        super(machine);
+    }
+
+    @Override
+    protected void returnCoin() {
+        machine.returnMoney(0.25);
+        machine.setCurrentState(machine.getIdleState());
+    }
+
+    @Override
+    protected void pushButton() {
+        if (!machine.hasCups()) {
+            System.out.println("The machine is out of cups");
+        } else if (!machine.hasCoffee()) {
+            System.out.println("The machine is out of coffee beans");
+        } else if (machine.isJammed()) {
+            System.out.println("The machine is jammed");
+        } else {
+            machine.makeCoffee();
+            machine.setCurrentState(machine.getCoffeeReadyState());
+            return;
+        }
+        machine.setCurrentState(machine.getServiceNeededState());
+    }
+}

src/lab7_state/ex1/states/CoffeeReadyState.java

@@ -0,0 +1,15 @@
+package lab7_state.ex1.states;
+
+import lab7_state.ex1.Machine;
+import lab7_state.ex1.MachineState;
+
+public class CoffeeReadyState extends MachineState {
+    public CoffeeReadyState(Machine machine) {
+        super(machine);
+    }
+
+    @Override
+    protected void removeCup() {
+        machine.setCurrentState(machine.getIdleState());
+    }
+}

src/lab7_state/ex1/states/IdleState.java

@@ -0,0 +1,20 @@
+package lab7_state.ex1.states;
+
+import lab7_state.ex1.Machine;
+import lab7_state.ex1.MachineState;
+
+public class IdleState extends MachineState {
+    public IdleState(Machine machine) {
+        super(machine);
+    }
+
+    @Override
+    protected void insertCoin(double value) {
+        if (value != 0.25) {
+            machine.returnMoney(value);
+        } else {
+            System.out.println("Please choose your coffee");
+            machine.setCurrentState(machine.getChoiceState());
+        }
+    }
+}

src/lab7_state/ex1/states/OffState.java

@@ -0,0 +1,15 @@
+package lab7_state.ex1.states;
+
+import lab7_state.ex1.Machine;
+import lab7_state.ex1.MachineState;
+
+public class OffState extends MachineState {
+    public OffState(Machine machine) {
+        super(machine);
+    }
+
+    @Override
+    protected void powerUp() {
+        machine.setCurrentState(machine.getIdleState());
+    }
+}

src/lab7_state/ex1/states/ServiceNeededState.java

@@ -0,0 +1,15 @@
+package lab7_state.ex1.states;
+
+import lab7_state.ex1.Machine;
+import lab7_state.ex1.MachineState;
+
+public class ServiceNeededState extends MachineState {
+    public ServiceNeededState(Machine machine) {
+        super(machine);
+    }
+
+    @Override
+    protected void reset() {
+        machine.setCurrentState(machine.getIdleState());
+    }
+}