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spring-core/src/main/java/com/baeldung/dependencyinjectiontypes/ConstructorInjection.java

@@ -0,0 +1,18 @@
+package com.baeldung.dependencyinjectiontypes;
+
+import org.springframework.beans.factory.annotation.Autowired;
+
+
+public class ConstructorInjection {
+
+    private final MyInjectedBean myInjectedBean;
+
+    @Autowired
+    public ConstructorInjection(MyInjectedBean myInjectedBean) {
+        this.myInjectedBean = myInjectedBean;
+    }
+
+    public MyInjectedBean getMyInjectedBean() {
+        return myInjectedBean;
+    }
+}

spring-core/src/main/java/com/baeldung/dependencyinjectiontypes/MyInjectedBean.java

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

spring-core/src/main/java/com/baeldung/dependencyinjectiontypes/SetterInjection.java

@@ -0,0 +1,19 @@
+package com.baeldung.dependencyinjectiontypes;
+
+import org.springframework.beans.factory.annotation.Autowired;
+
+
+public class SetterInjection
+{
+
+    private MyInjectedBean myInjectedBean;
+
+    @Autowired
+    public void setMyInjectedBean(MyInjectedBean myInjectedBean) {
+        this.myInjectedBean = myInjectedBean;
+    }
+
+    public MyInjectedBean getMyInjectedBean() {
+        return myInjectedBean;
+    }
+}

spring-core/src/test/java/com/baeldung/dependencyinjectiontypes/InjectionTest.java

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+package com.baeldung.dependencyinjectiontypes;
+
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+import org.springframework.context.annotation.AnnotationConfigApplicationContext;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+
+public class InjectionTest
+{
+
+    private AnnotationConfigApplicationContext ctx;
+
+    @Before
+    public void setUp() {
+        ctx = new AnnotationConfigApplicationContext(MyInjectedBean.class, ConstructorInjection.class, SetterInjection.class);
+    }
+
+    @Test
+    public void testConstructorInjection() {
+        ConstructorInjection constructorInjection = ctx.getBean(ConstructorInjection.class);
+        Assert.assertNotNull(constructorInjection.getMyInjectedBean());
+    }
+
+    @Test
+    public void testSetterInjection() {
+        SetterInjection setterInjection = ctx.getBean(SetterInjection.class);
+        Assert.assertNotNull(setterInjection.getMyInjectedBean());
+    }
+
+    @Test
+    public void testSetterInjectionNonMandatory() {
+        SetterInjection setterInjection = new SetterInjection();
+        Assert.assertNull(setterInjection.getMyInjectedBean());
+    }
+}