Difference between CDI and EJB singleton (#6915)

* Singleton injection examples and tests added

* code and tests implemented

jee-7/src/main/java/com/baeldung/singleton/Car.java

@@ -0,0 +1,28 @@
+package com.baeldung.singleton;
+
+public class Car {
+    
+    private String type;
+    private String model;
+    private boolean serviced = false;
+    
+    public Car(String type, String model) {
+        super();
+        this.type = type;
+        this.model = model;
+    }
+
+    public boolean isServiced () {
+        return serviced;
+    }
+    
+    public void setServiced(Boolean serviced) {
+        this.serviced = serviced;
+    }
+
+    @Override
+    public String toString() {
+        return "Car [type=" + type + ", model=" + model + "]";
+    }
+    
+}