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Add "State"
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‎State/README.md‎

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# Stateパターン

‎State/src/Context.java‎

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public interface Context {
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public abstract void setClock(int hour);
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public abstract void changeState(State state);
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public abstract void callSecurityCenter(String msg);
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public abstract void recordLog(String msg);
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}

‎State/src/DayState.java‎

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public class DayState implements State {
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private static DayState instance = new DayState();
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private DayState() {}
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public static DayState getInstance() {
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return DayState.instance;
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}
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public void doClock(Context context, int hour) {
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if (hour < 9 || 17 <= hour) {
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context.changeState(NightState.getInstance());
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}
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}
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public void doUse(Context context) {
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context.recordLog("Use (daytime)");
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}
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public void doAlarm(Context context) {
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context.callSecurityCenter("Alerm (daytime)");
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}
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public void doPhone(Context context) {
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context.callSecurityCenter("Phone (daytime)");
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}
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public String toString() {
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return "DAYTIME";
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}
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}

‎State/src/Main.java‎

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public class Main extends Thread {
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public static void main(String[] args) {
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SafeFrame frame = new SafeFrame("State Sample");
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while (true) {
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for (int hour = 0; hour < 24; hour++) {
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frame.setClock(hour);
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try {
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Thread.sleep(1000);
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} catch (InterruptedException e) {}
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}
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}
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}
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}

‎State/src/NightState.java‎

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public class NightState implements State {
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private static NightState instance = new NightState();
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private NightState() {}
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public static NightState getInstance() {
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return NightState.instance;
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}
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public void doClock(Context context, int hour) {
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if (9 <= hour && hour < 17) {
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context.changeState(DayState.getInstance());
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}
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}
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public void doUse(Context context) {
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context.callSecurityCenter("Use in night (emergency)");
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}
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public void doAlarm(Context context) {
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context.callSecurityCenter("Ringing alarm (nighttime)");
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}
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public void doPhone(Context context) {
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context.recordLog("Phone (nighttime)");
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}
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public String toString() {
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return "NIGHTTIME";
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}
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}

‎State/src/SafeFrame.java‎

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import java.awt.Frame;
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import java.awt.Label;
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import java.awt.Color;
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import java.awt.Button;
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import java.awt.TextField;
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import java.awt.TextArea;
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import java.awt.Panel;
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import java.awt.BorderLayout;
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import java.awt.event.ActionListener;
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import java.awt.event.ActionEvent;
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public class SafeFrame extends Frame implements ActionListener, Context {
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private TextField clock = new TextField(60);
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private TextArea screen = new TextArea(10, 60);
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private Button btnUse = new Button("金庫使用");
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private Button btnAlarm = new Button("非常ベル");
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private Button btnPhone = new Button("通常電話");
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private Button btnExit = new Button("終了");
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// private State currentState = DayState.getInstance();
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private State currentState = (State)NightState.getInstance();
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public SafeFrame(String title) {
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super(title);
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this.setBackground(Color.lightGray);
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this.setLayout(new BorderLayout());
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this.add(this.clock, BorderLayout.NORTH);
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this.clock.setEditable(false);
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this.add(this.screen, BorderLayout.CENTER);
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this.screen.setEditable(false);
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Panel panel = new Panel();
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panel.add(this.btnUse);
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panel.add(this.btnAlarm);
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panel.add(this.btnPhone);
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panel.add(this.btnExit);
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this.add(panel, BorderLayout.SOUTH);
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this.pack();
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// this.show();
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this.setVisible(true);
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this.btnUse.addActionListener(this);
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this.btnAlarm.addActionListener(this);
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this.btnPhone.addActionListener(this);
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this.btnExit.addActionListener(this);
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}
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public void actionPerformed(ActionEvent e) {
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if (e.getSource() == this.btnUse) {
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this.currentState.doUse(this);
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} else if (e.getSource() == this.btnAlarm) {
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this.currentState.doAlarm(this);
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} else if (e.getSource() == this.btnPhone) {
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this.currentState.doPhone(this);
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} else if (e.getSource() == this.btnExit) {
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System.exit(0);
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} else {
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System.out.println("????");
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}
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}
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public void setClock(int hour) {
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String clockstring = "現在時刻は";
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if (hour < 10) {
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clockstring += "0" + hour + ":00";
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} else {
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clockstring += hour + ":00";
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}
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this.clock.setText(clockstring);
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this.currentState.doClock(this, hour);
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}
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public void changeState(State state) {
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System.out.println("state has changed to " + state);
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this.currentState = state;
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}
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public void callSecurityCenter(String msg) {
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this.screen.append("Call! " + msg + "\n");
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}
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public void recordLog(String msg) {
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this.screen.append("Log.. " + msg + "\n");
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}
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}

‎State/src/State.java‎

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public interface State {
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public abstract void doClock(Context context, int hour);
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public abstract void doUse(Context context);
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public abstract void doAlarm(Context context);
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public abstract void doPhone(Context context);
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}

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