Commit for Different Types of Bean Injection in Spring — Draft article

spring-core/src/main/java/com/baeldung/beaninjectiontypes/Boat.java

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+package com.baeldung.beaninjectiontypes;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+
+@Component
+public class Boat {
+
+    private Engine engine;
+
+    @Autowired
+    public void setEngine(Engine engine) {
+        this.engine = engine;
+    }
+
+    public Engine getEngine() {
+        return engine;
+    }
+}

spring-core/src/main/java/com/baeldung/beaninjectiontypes/Car.java

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+package com.baeldung.beaninjectiontypes;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+
+@Component
+public class Car {
+    @Autowired
+    private Engine engine;
+
+    public void setEngine(Engine engine) {
+        this.engine = engine;
+    }
+
+    public Engine getEngine() {
+        return engine;
+    }
+}

spring-core/src/main/java/com/baeldung/beaninjectiontypes/Config.java

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+package com.baeldung.beaninjectiontypes;
+
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+@ComponentScan("com.baeldung.beaninjectiontypes")
+public class Config {
+
+}

spring-core/src/main/java/com/baeldung/beaninjectiontypes/Engine.java

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+package com.baeldung.beaninjectiontypes;
+
+import org.springframework.stereotype.Component;
+
+@Component
+public class Engine {
+
+}

spring-core/src/main/java/com/baeldung/beaninjectiontypes/LawnMower.java

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+package com.baeldung.beaninjectiontypes;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+
+@Component
+public class LawnMower {
+
+    @Autowired
+    private Engine engine;
+
+    public LawnMower(Engine engine) {
+        this.engine = engine;
+    }
+
+    public Engine getEngine() {
+        return engine;
+    }
+}

spring-core/src/main/java/com/baeldung/beaninjectiontypes/Rocket.java

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+package com.baeldung.beaninjectiontypes;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+
+@Component
+public class Rocket {
+
+    private Engine engine;
+
+    @Autowired
+    public Rocket(Engine engine) {
+        this.engine = engine;
+    }
+
+    public Engine getEngine() {
+        return engine;
+    }
+
+}

spring-core/src/test/java/com/baeldung/beaninjectiontypes/BoatTest.java

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+package com.baeldung.beaninjectiontypes;
+
+import static org.junit.Assert.assertNotNull;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+
+@RunWith(SpringJUnit4ClassRunner.class)
+@ContextConfiguration(classes = Config.class)
+public class BoatTest {
+
+    @Autowired
+    Boat boat;
+
+    @Test
+    public void engineInjectionTest() {
+        assertNotNull(boat);
+        assertNotNull(boat.getEngine());
+    }
+}

spring-core/src/test/java/com/baeldung/beaninjectiontypes/CarTest.java

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+package com.baeldung.beaninjectiontypes;
+
+import static org.junit.Assert.assertNotNull;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+
+@RunWith(SpringJUnit4ClassRunner.class)
+@ContextConfiguration(classes = Config.class)
+public class CarTest {
+
+    @Autowired
+    Car car;
+
+    @Test
+    public void engineInjectionTest() {
+        assertNotNull(car);
+        assertNotNull(car.getEngine());
+    }
+}

spring-core/src/test/java/com/baeldung/beaninjectiontypes/LawnMowerTest.java

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+package com.baeldung.beaninjectiontypes;
+
+import static org.junit.Assert.assertNotNull;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+
+@RunWith(SpringJUnit4ClassRunner.class)
+@ContextConfiguration(classes = Config.class)
+public class LawnMowerTest {
+
+    @Autowired
+    LawnMower lawnMower;
+
+    @Test
+    public void engineInjectionTest() {
+        assertNotNull(lawnMower);
+        assertNotNull(lawnMower.getEngine());
+    }
+}

spring-core/src/test/java/com/baeldung/beaninjectiontypes/RocketTest.java

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+package com.baeldung.beaninjectiontypes;
+
+import static org.junit.Assert.assertNotNull;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+
+@RunWith(SpringJUnit4ClassRunner.class)
+@ContextConfiguration(classes = Config.class)
+public class RocketTest {
+
+    @Autowired
+    Rocket rocket;
+
+    @Test
+    public void engineInjectionTest() {
+        assertNotNull(rocket);
+        assertNotNull(rocket.getEngine());
+    }
+}