Initial data commit

Task/Abstract-type/Java/abstract-type-1.java

@@ -0,0 +1,14 @@
+interface Example {
+    String stringA = "rosetta";
+    String stringB = "code";
+
+    private String methodA() {
+        return stringA + " " + stringB;
+    }
+
+    default int methodB(int value) {
+        return value + 100;
+    }
+
+    int methodC(int valueA, int valueB);
+}

Task/Abstract-type/Java/abstract-type-2.java

@@ -0,0 +1,9 @@
+class ExampleImpl implements Example {
+    public int methodB(int value) {
+        return value + 200;
+    }
+
+    public int methodC(int valueA, int valueB) {
+        return valueA + valueB;
+    }
+}

Task/Abstract-type/Java/abstract-type-3.java

@@ -0,0 +1,14 @@
+abstract class Example {
+    String stringA = "rosetta";
+    String stringB = "code";
+
+    private String methodA() {
+        return stringA + " " + stringB;
+    }
+
+    protected int methodB(int value) {
+        return value + 100;
+    }
+
+    public abstract int methodC(int valueA, int valueB);
+}

Task/Abstract-type/Java/abstract-type-4.java

@@ -0,0 +1,5 @@
+class ExampleImpl extends Example {
+    public int methodC(int valueA, int valueB) {
+        return valueA + valueB;
+    }
+}