Put testsuite in its own directory

testsuite/classes/java/CustomAttribute.java

@@ -0,0 +1,10 @@
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+import java.lang.annotation.ElementType;
+
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.TYPE)
+public @interface CustomAttribute {
+}
+

testsuite/classes/java/Hello.java

@@ -0,0 +1,6 @@
+class Hello {
+    public static void main(String[] args) {
+        System.out.println("Hello, world!");
+    }
+}
+

testsuite/classes/java/Interface.java

@@ -0,0 +1,10 @@
+public interface Interface {
+
+    String getName();
+
+    default void sayHello() {
+        System.out.println("Hello " + getName());
+    }
+
+}
+

testsuite/classes/java/Main.java

@@ -0,0 +1,41 @@
+import java.util.function.Supplier;
+
+@CustomAttribute
+public class Main implements Runnable, Supplier<Integer>, Interface {
+    private static final String name = "John";
+    private static final int number = 42;
+    private static final double funnyNumber = 6.9;
+
+    public static void main() {
+        new Main().sayHello();
+    }
+    
+    @Override
+    public void run() {
+        Main.main();
+    }
+    
+    @Override
+    public Integer get() {
+        return number;
+    }
+
+    @Override
+    public String getName() {
+        return name;
+    }
+
+    public void throwSomething() throws Throwable {
+        throw new Throwable() {
+            @Override
+            public String getMessage() {
+                return "Hello";
+            }
+        };
+    }
+
+    public static class Inner {
+        private static final String name = "Inner John";
+    }
+}
+

testsuite/classes/java/MultiThreading.java

@@ -0,0 +1,22 @@
+import java.util.concurrent.Executors;
+import java.util.stream.IntStream;
+import java.util.concurrent.TimeUnit;
+
+public class MultiThreading {
+    private int number = 0;
+
+    public static void main(String[] args) throws InterruptedException {
+        final var multiThreading = new MultiThreading();
+
+        final var service = Executors.newFixedThreadPool(3);
+        IntStream.range(0, 1000)
+            .forEach(count -> service.submit(multiThreading::increment));
+        service.awaitTermination(1000, TimeUnit.MILLISECONDS);
+
+        System.out.println(multiThreading.number);
+    }
+
+    public synchronized void increment() {
+        number += 1;
+    }
+}