享元模式模式 源码举例

pom.xml

@@ -115,6 +115,11 @@
             <artifactId>tomcat-embed-core</artifactId>
             <version>8.5.32</version>
         </dependency>
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-pool2</artifactId>
+            <version>2.4.2</version>
+        </dependency>
 
     </dependencies>
 

src/main/java/top/fjy8018/designpattern/pattern/structural/flyweight/Employee.java

@@ -2,6 +2,9 @@ package top.fjy8018.designpattern.pattern.structural.flyweight;
 
 /**
  * 享元模式：利用共享的方式来支持大量细粒度的对象，这些对象一部分内部状态是相同的。
+ * JDK源码：{@link Integer#valueOf(int)} {@link Integer.IntegerCache}
+ *  其他类型同理 {@link Long#valueOf(long)} {@link Boolean#valueOf(boolean)} {@link Byte#valueOf(byte)} {@link Character#valueOf(char)}
+ * Apache源码：连接池{@link org.apache.commons.pool2.impl.GenericObjectPool#returnObject(Object)},连接池配置 {@link org.apache.commons.pool2.impl.GenericObjectPoolConfig}
  *
  * @author F嘉阳
  * @date 2018-10-14 16:13

src/test/java/top/fjy8018/designpattern/pattern/structural/flyweight/EmployeeTest.java

@@ -1,7 +1,9 @@
 package top.fjy8018.designpattern.pattern.structural.flyweight;
 
+import lombok.extern.slf4j.Slf4j;
 import org.junit.jupiter.api.Test;
 
+@Slf4j
 class EmployeeTest {
 
     private static final String departments[] = {"RD", "QA", "PM", "BD"};
@@ -14,4 +16,17 @@ class EmployeeTest {
             employee.report();
         }
     }
+
+    @Test
+    void integerTest() {
+        Integer a = new Integer(88);
+        int c = 88;
+        Integer d = new Integer(88);
+        Integer e = Integer.valueOf(88);
+        Integer f = 88;
+        log.info("a==c? {}", a == c);
+        log.info("a==d? {}", a == d);
+        log.info("a==e? {}", a == e);
+        log.info("e==f? {}", e == f);
+    }
 }