done

pom.xml

@@ -8,9 +8,10 @@
     <artifactId>custom-classloader</artifactId>
     <version>1.0-SNAPSHOT</version>
 
+
     <properties>
-        <maven.compiler.source>17</maven.compiler.source>
-        <maven.compiler.target>17</maven.compiler.target>
+        <maven.compiler.source>11</maven.compiler.source>
+        <maven.compiler.target>11</maven.compiler.target>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     </properties>
 

src/main/java/club/shengsheng/MyClassLoader.java

@@ -1,9 +1,45 @@
 package club.shengsheng;
 
 
-/**
- * @author [email protected]
- **/
+import java.io.File;
+import java.nio.file.Files;
+
 public class MyClassLoader extends ClassLoader {
+    @Override
+    protected Class<?> loadClass(String name, boolean resolve)
+            throws ClassNotFoundException {
+        synchronized (getClassLoadingLock(name)) {
+            // First, check if the class has already been loaded
+            Class<?> c = findLoadedClass(name);
+            if (c == null) {
+                if (name.startsWith("tech")) {
+                    c = findClass(name);
+                } else {
+                    c = getParent().loadClass(name);
+                }
+            }
+            if (resolve) {
+                resolveClass(c);
+            }
+            return c;
+        }
+    }
+
+    @Override
+    protected Class<?> findClass(String name) throws ClassNotFoundException {
+        String rootFile = System.getProperty("user.dir").concat(".加密".replace('.', File.separatorChar)).concat(".class");
+        File classFile = new File(rootFile);
+        byte[] classBytes;
+        try {
+            classBytes = Files.readAllBytes(classFile.toPath());
+            for (int i = 0; i < classBytes.length; i++) {
+                classBytes[i] -= 1;
+            }
+
+        } catch (Exception e) {
+            throw new ClassNotFoundException();
+        }
+        return defineClass(name, classBytes, 0, classBytes.length);
 
-}
+    }
+}