Bean injection types

spring-core/src/main/java/com/baeldung/samplebeaninjectionypes/AccountDetails.java

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+package com.baeldung.samplebeaninjectionypes;
+
+public class AccountDetails {
+
+        private Long accountNumber;
+
+        private String accountType;
+
+        private String accountName;
+
+        public AccountDetails(Long accountNumber, String accountType, String accountName) {
+                this.accountNumber = accountNumber;
+                this.accountType = accountType;
+                this.accountName = accountName;
+        }
+
+        public Long getAccountNumber() {
+                return accountNumber;
+        }
+
+        public void setAccountNumber(Long accountNumber) {
+                this.accountNumber = accountNumber;
+        }
+
+        public String getAccountType() {
+                return accountType;
+        }
+
+        public void setAccountType(String accountType) {
+                this.accountType = accountType;
+        }
+
+        public String getAccountName() {
+                return accountName;
+        }
+
+        public void setAccountName(String accountName) {
+                this.accountName = accountName;
+        }
+}

spring-core/src/main/java/com/baeldung/samplebeaninjectionypes/BankAccountApplication.java

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+package com.baeldung.samplebeaninjectionypes;
+
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.support.ClassPathXmlApplicationContext;
+
+public class BankAccountApplication {
+
+
+    public static void main(String[] args) {
+        ApplicationContext context = new ClassPathXmlApplicationContext("samplebeaninjectiontypes-context.xml");
+        BankAccountWithSetterInjection bankAccountWithSetterInjection = (BankAccountWithSetterInjection) context.getBean("bankAccountWithSetterInjectionBean");
+
+        bankAccountWithSetterInjection.openAccount(12345L,"Savings","John Doe");
+
+        BankAccountWithConstructorInjection bankAccountWithConstructorInjection = (BankAccountWithConstructorInjection) context.getBean("bankAccountWithConstructorInjectionBean");
+        bankAccountWithSetterInjection.openAccount(12345L,"Savings","John Doe");
+
+    }
+}

spring-core/src/main/java/com/baeldung/samplebeaninjectionypes/BankAccountService.java

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+package com.baeldung.samplebeaninjectionypes;
+
+public class BankAccountService {
+
+        public AccountDetails openAccount(Long accountNumber, String accountType, String owner) {
+                AccountDetails accountDetails = new AccountDetails(accountNumber,accountType,owner);
+                return accountDetails;
+        }
+}

spring-core/src/main/java/com/baeldung/samplebeaninjectionypes/BankAccountWithConstructorInjection.java

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+package com.baeldung.samplebeaninjectionypes;
+
+import org.springframework.beans.factory.annotation.Autowired;
+
+public class BankAccountWithConstructorInjection {
+    private BankAccountService bankAccountService;
+
+    @Autowired
+    public BankAccountWithConstructorInjection(BankAccountService service) {
+        this.bankAccountService = service;
+    }
+
+    public AccountDetails openAccount(Long accountNumber, String accountType, String owner) {
+        return bankAccountService.openAccount(accountNumber, accountType, owner);
+    }
+
+}

spring-core/src/main/java/com/baeldung/samplebeaninjectionypes/BankAccountWithSetterInjection.java

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+package com.baeldung.samplebeaninjectionypes;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Qualifier;
+
+public class BankAccountWithSetterInjection {
+
+        private BankAccountService bankAccountService;
+
+        public BankAccountWithSetterInjection(BankAccountService service) {
+                this.bankAccountService = service;
+        }
+
+        @Autowired
+        public void setBankAccountService(BankAccountService bankAccountService) {
+                this.bankAccountService = bankAccountService;
+        }
+
+        public AccountDetails openAccount(Long accountNumber, String accountType, String owner) {
+                return bankAccountService.openAccount(accountNumber, accountType, owner);
+        }
+}

spring-core/src/main/resources/samplebeaninjectiontypes-context.xml

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+<beans xmlns="http://www.springframework.org/schema/beans"
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
+	xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context"
+	xmlns:jee="http://www.springframework.org/schema/jee" xmlns:tx="http://www.springframework.org/schema/tx"
+	xmlns:task="http://www.springframework.org/schema/task" xsi:schemaLocation="http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.2.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-3.2.xsd">
+   
+   <context:annotation-config/>
+
+	<bean id="bankAccountWithConstructorInjectionBean"
+		  class="com.baeldung.samplebeaninjectionypes.BankAccountWithConstructorInjection">
+		<constructor-arg ref="bankAccountService" />
+	</bean>
+
+	<bean id="bankAccountWithSetterInjection"
+		  class="com.baeldung.samplebeaninjectionypes.BankAccountWithSetterInjection">
+		<constructor-arg ref="bankAccountService" />
+	</bean>
+
+	<bean id="bankAccountService" class="com.baeldung.samplebeaninjectionypes.BankAccountService">
+	</bean>
+</beans>

spring-core/src/test/java/com/baeldung/samplebeaninjectiontypes/SampleBeanInjectionTest.java

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+package com.baeldung.samplebeaninjectiontypes;
+
+import com.baeldung.dependencyinjectiontypes.ArticleWithSetterInjection;
+import com.baeldung.samplebeaninjectionypes.AccountDetails;
+import com.baeldung.samplebeaninjectionypes.BankAccountWithConstructorInjection;
+import com.baeldung.samplebeaninjectionypes.BankAccountWithSetterInjection;
+import org.junit.Test;
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.annotation.AnnotationConfigApplicationContext;
+import org.springframework.context.support.ClassPathXmlApplicationContext;
+
+import static org.junit.Assert.assertTrue;
+
+public class SampleBeanInjectionTest {
+
+    @Test
+    public void testSetterInjectionValid() {
+
+        ApplicationContext context = new ClassPathXmlApplicationContext("samplebeaninjectiontypes-context.xml");
+        BankAccountWithSetterInjection bankAccountWithSetterInjection = (BankAccountWithSetterInjection) context.getBean("bankAccountWithSetterInjection");
+
+        String owner = "John Doe";
+        AccountDetails accountDetails = bankAccountWithSetterInjection.openAccount(12345L,"Savings",owner);
+
+        assertTrue(accountDetails.getAccountName().equals(owner));
+
+    }
+
+    @Test
+    public void testConstructorInjectionValid() {
+
+        ApplicationContext context = new ClassPathXmlApplicationContext("samplebeaninjectiontypes-context.xml");
+        BankAccountWithConstructorInjection bankAccountWithConstructorInjection = (BankAccountWithConstructorInjection) context.getBean("bankAccountWithConstructorInjectionBean");
+
+        String owner = "John Doe";
+        AccountDetails accountDetails = bankAccountWithConstructorInjection.openAccount(12345L,"Savings",owner);
+
+        assertTrue(accountDetails.getAccountName().equals(owner));
+    }
+}