feat: 添加用于快速创建 map 的 MapUtil 及测试类

Author: cadecode

src/main/java/info/cadecode/simple/util/MapUtil.java

@@ -0,0 +1,66 @@
+package info.cadecode.simple.util;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+/**
+ * @author Cade Li
+ * @date 2021/7/18
+ * @description: 链式调用的 map 工具类
+ */
+public class MapUtil {
+
+    public static MapBuilder<String, Object> create() {
+        return new MapBuilder<String, Object>(new LinkedHashMap<>());
+    }
+
+    public static <K, V> MapBuilder<K, V> create(Map<K, V> map) {
+        return new MapBuilder<K, V>(map);
+    }
+
+    public static class MapBuilder<K, V> {
+
+        private Map<K, V> map;
+
+        /**
+         * 私有构造
+         */
+        private MapBuilder(Map<K, V> map) {
+            this.map = map;
+        }
+
+        /**
+         * 链式添加
+         */
+        public MapBuilder<K, V> add(K k, V v) {
+            map.put(k, v);
+            return this;
+        }
+
+        /**
+         * 链式删除
+         */
+        public MapBuilder<K, V> del(K k) {
+            map.remove(k);
+            return this;
+        }
+
+        /**
+         * 转外 map
+         */
+        public Map<K, V> asMap() {
+            return map;
+        }
+
+        /**
+         * 转外 map
+         */
+        public String asJson() {
+            return JsonUtil.objToStr(map);
+        }
+
+        private void setMap(Map<K, V> map) {
+            this.map = map;
+        }
+    }
+}

src/test/java/info/cadecode/simple/util/MapUtilTest.java

@@ -0,0 +1,23 @@
+package info.cadecode.simple.util;
+
+import info.cadecode.simple.SimpleSpringBootApplicationTests;
+import org.junit.jupiter.api.Test;
+
+import java.util.HashMap;
+
+/**
+ * @author Cade Li
+ * @date 2021/7/18
+ * @description:
+ */
+public class MapUtilTest extends SimpleSpringBootApplicationTests {
+
+    @Test
+    public void add() {
+        String json = MapUtil.create(new HashMap<String, Integer>())
+                .add("a", 1)
+                .add("b", 2)
+                .asJson();
+        log.info("json: {}", json);
+    }
+}