jdk

Author: AlanGeeker

jdbc/pom.xml

@@ -20,7 +20,7 @@
         <dependency>
             <groupId>mysql</groupId>
             <artifactId>mysql-connector-java</artifactId>
-            <version>8.0.24</version>
+            <version>8.0.25</version>
         </dependency>
 
     </dependencies>

jdk/pom.xml

@@ -24,6 +24,11 @@
 
     <dependencies>
 
+        <dependency>
+            <groupId>ch.qos.logback</groupId>
+            <artifactId>logback-classic</artifactId>
+        </dependency>
+
     </dependencies>
 
 </project>

jdk/src/file/No0001_CreateObject/UserVo.txt

@@ -0,0 +1,8 @@
+package org.blogtree.java.demo.jdk;
+
+public class No0000_HelloWorld {
+
+    public static void main(String[] args){
+        System.out.println("Hello World!");
+    }
+}

jdk/src/main/java/org/blogtree/java/demo/jdk/No0000_HelloWorld.java

@@ -0,0 +1,54 @@
+package org.blogtree.java.demo.jdk;
+
+import lombok.extern.slf4j.Slf4j;
+import org.blogtree.java.demo.jdk.bean.UserVo;
+
+import java.io.*;
+
+@Slf4j
+public class No0001_CreateObject {
+
+    public static void main(String[] args) {
+        // 方式1：通过 new
+        UserVo user1 = new UserVo();
+        user1.setId(1);
+        user1.setName("name_1");
+        log.info("user1={}", user1);
+
+        // 方法2：通过 反射
+        try {
+            UserVo user2 = UserVo.class.newInstance();
+            user2.setId(2);
+            user2.setName("name_2");
+            log.info("user2={}", user2);
+        } catch (InstantiationException | IllegalAccessException e) {
+            log.error("user2-create-error", e);
+        }
+
+        // 方法3：通过 clone()
+        UserVo user3 = user1.clone();
+        log.info("user3={}", user3);
+        user3.setId(3);
+        user3.setName("name_3");
+        log.info("user1={}", user1);
+        log.info("user3={}", user3);
+
+
+        // 方法4：通过 反序列化
+        // file地址
+        String filePath = "jdk/src/file/No0001_CreateObject/UserVo.txt";
+        // 将数据写入file
+        try (ObjectOutputStream outputStream = new ObjectOutputStream(new FileOutputStream(filePath))) {
+            outputStream.writeObject(new UserVo(4, "name_4"));
+        } catch (Exception e) {
+            log.error("user4-create-error-outputStream", e);
+        }
+        // 从file读取数据
+        try (ObjectInputStream inputStream = new ObjectInputStream(new FileInputStream(filePath))) {
+            UserVo user4 = (UserVo) inputStream.readObject();
+            log.info("user4={}", user4);
+        } catch (IOException | ClassNotFoundException e) {
+            log.error("user4-create-error-inputStream", e);
+        }
+    }
+}

jdk/src/main/java/org/blogtree/java/demo/jdk/No0001_CreateObject.java

@@ -0,0 +1,48 @@
+package org.blogtree.java.demo.jdk.bean;
+
+import lombok.Getter;
+import lombok.Setter;
+
+import java.io.Serializable;
+
+@Getter
+@Setter
+public class UserVo implements Cloneable, Serializable {
+
+    private static final long serialVersionUID = 5357091716443212892L;
+
+    private Integer id;
+
+    private String name;
+
+
+    public UserVo() {
+
+    }
+
+    public UserVo(Integer id, String name) {
+        this.id = id;
+        this.name = name;
+    }
+
+    /**
+     * 实现浅克隆
+     */
+    public UserVo clone() {
+        UserVo employee = null;
+        try {
+            employee = (UserVo) super.clone();
+        } catch (CloneNotSupportedException e) {
+            e.printStackTrace();
+        }
+        return employee;
+    }
+
+    @Override
+    public String toString() {
+        return "UserVo{" +
+                "id=" + id +
+                ", name='" + name + '\'' +
+                '}';
+    }
+}

jdk/src/main/java/org/blogtree/java/demo/jdk/bean/UserVo.java

@@ -15,8 +15,8 @@
         <maven.compiler.target>1.8</maven.compiler.target>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
-        <lombok.version>1.18.20</lombok.version>
-        <slf4j.version>1.7.30</slf4j.version>
+        <lombok.version>1.18.22</lombok.version>
+        <slf4j.version>1.7.32</slf4j.version>
         <!-- spring boot -->
         <spring.boot.version>2.6.2</spring.boot.version>
     </properties>
@@ -48,7 +48,6 @@
         <dependency>
             <groupId>junit</groupId>
             <artifactId>junit</artifactId>
-            <version>4.12</version>
             <scope>test</scope>
         </dependency>
 
@@ -66,6 +65,12 @@
                 <scope>import</scope>
             </dependency>
 
+            <dependency>
+                <groupId>ch.qos.logback</groupId>
+                <artifactId>logback-classic</artifactId>
+                <version>1.2.10</version>
+            </dependency>
+
         </dependencies>
     </dependencyManagement>