map injection

spring-core/src/main/java/com/baeldung/collection/CollectionConfig.java

@@ -3,9 +3,7 @@ package com.baeldung.collection;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 
-import java.util.Arrays;
+import java.util.*;
-import java.util.HashSet;
-import java.util.List;
 
 @Configuration
 public class CollectionConfig {
@@ -19,4 +17,13 @@ public class CollectionConfig {
     public List<String> nameList(){
         return Arrays.asList("John", "Adam", "Harry", null);
     }
+
+    @Bean
+    public Map<Integer, String> nameMap(){
+        Map<Integer, String>  nameMap = new HashMap<>();
+        nameMap.put(1, "John");
+        nameMap.put(2, "Adam");
+        nameMap.put(3, "Harry");
+        return nameMap;
+    }
 }

spring-core/src/main/java/com/baeldung/collection/CollectionInjectionDemo.java

@@ -14,5 +14,6 @@ public class CollectionInjectionDemo {
         CollectionsBean collectionsBean = context.getBean(CollectionsBean.class);
         collectionsBean.printNameList();
         collectionsBean.printNameSet();
+        collectionsBean.printNameMap();
     }
 }

spring-core/src/main/java/com/baeldung/collection/CollectionsBean.java

@@ -3,6 +3,7 @@ package com.baeldung.collection;
 import org.springframework.beans.factory.annotation.Autowired;
 
 import java.util.List;
+import java.util.Map;
 import java.util.Set;
 
 /**
@@ -15,6 +16,8 @@ public class CollectionsBean {
 
     private Set<String> nameSet;
 
+    private Map<Integer, String> nameMap;
+
     public CollectionsBean() {
     }
 
@@ -22,6 +25,11 @@ public class CollectionsBean {
         this.nameSet = strings;
     }
 
+    @Autowired
+    public void setNameMap(Map<Integer, String> nameMap) {
+        this.nameMap = nameMap;
+    }
+
     public void printNameList() {
         System.out.println(nameList);
     }
@@ -29,4 +37,8 @@ public class CollectionsBean {
     public void printNameSet() {
         System.out.println(nameSet);
     }
+
+    public void printNameMap() {
+        System.out.println(nameMap);
+    }
 }