Adapter

src/main/java/com/dongho/df/domain/structural/adapter/Alarm.java

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+package com.dongho.df.domain.structural.adapter;
+
+import java.io.File;
+
+public interface Alarm {
+
+    void sendText(String text);
+    void sendMessage(File image);
+
+}

src/main/java/com/dongho/df/domain/structural/adapter/MailAlarm.java

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+package com.dongho.df.domain.structural.adapter;
+
+import java.io.File;
+
+public class MailAlarm implements Alarm {
+
+    @Override
+    public void sendText(String text) {
+        System.out.println("send text");
+    }
+
+    @Override
+    public void sendMessage(File image) {
+        System.out.println("send " + image.getName());
+    }
+
+}

src/main/java/com/dongho/df/domain/structural/adapter/SmsAlarm.java

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+package com.dongho.df.domain.structural.adapter;
+
+import java.io.File;
+
+public class SmsAlarm implements Alarm {
+
+    private SmsTransferLib smsTransferLib;
+
+    public SmsAlarm(SmsTransferLib smsTransferLib) {
+        this.smsTransferLib = smsTransferLib;
+    }
+
+    @Override
+    public void sendText(String text) {
+        smsTransferLib.sendMessage(text.toCharArray());
+    }
+
+    @Override
+    public void sendMessage(File image) {
+        smsTransferLib.sendMessage("".toCharArray(), image);
+    }
+
+}

src/main/java/com/dongho/df/domain/structural/adapter/SmsTransferLib.java

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+package com.dongho.df.domain.structural.adapter;
+
+import java.io.File;
+
+public class SmsTransferLib {
+
+    public void sendMessage(char[] message) {
+        System.out.println(message);
+    }
+
+    public void sendMessage(char [] message, File image) {
+        System.out.println(message + image.getName());
+    }
+
+}