+ KeyboardReader

+ JUnit Tests

pom.xml

@@ -17,8 +17,27 @@
                     <target>8</target>
                 </configuration>
             </plugin>
+            <plugin>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>2.22.0</version>
+            </plugin>
         </plugins>
     </build>
 
+    <dependencies>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-api</artifactId>
+            <version>RELEASE</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-engine</artifactId>
+            <version>RELEASE</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
 
 </project>

src/main/java/xyz/joethei/studium/algodat/vorlesung/KeyboardReader.java

@@ -0,0 +1,29 @@
+package xyz.joethei.studium.algodat.vorlesung;
+
+import java.util.Stack;
+
+class KeyboardReader {
+
+    private Stack<Character> stack = new Stack<>();
+
+    private void input(char c) {
+        if(c == '#') stack.pop();
+        else if(c == '~') stack.clear();
+        else stack.push(c);
+    }
+
+    String getString() {
+        StringBuilder stringBuilder = new StringBuilder();
+        for (char c : stack) {
+            stringBuilder.append(c);
+        }
+        return stringBuilder.toString();
+    }
+
+    void read(String input) {
+        for (char c: input.toCharArray()) {
+            input(c);
+        }
+    }
+
+}

src/test/java/xyz/joethei/studium/algodat/vorlesung/KeyboardReaderTest.java

@@ -0,0 +1,22 @@
+package xyz.joethei.studium.algodat.vorlesung;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+class KeyboardReaderTest {
+
+    @Test
+    void druckeTest() {
+        KeyboardReader reader = new KeyboardReader();
+        reader.read("D#dr-+~druk#ckeh#");
+        assertEquals("drucke", reader.getString());
+    }
+
+    @Test
+    void blaTest() {
+        KeyboardReader reader = new KeyboardReader();
+        reader.read("grwgafmrag~grsegsthbrshfb~b#blq#a");
+        assertEquals("bla", reader.getString());
+    }
+}