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【笔记】Java手动向内存中加载类

 1 year ago
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【笔记】Java手动向内存中加载类

2023-01-26

Java手动向内存中加载类

手动向内存中加载类

Opcodes.V1_8：JDK版本
Opcodes.ACC_PUBLIC：作用域
"Class1"：类名
"com"：包名
java/lang/Object：父类
null：接口

public class Demo extends ClassLoader {
    public static void main(String[] args) {
        // 定义一个类
        ClassWriter classWriter = new ClassWriter(0);
        byte[] code = classWriter.visit(Opcodes.V1_8, Opcodes.ACC_PUBLIC, "Class1", "com", "java/lang/Object", null).toByteArray();
        // 加载一个类
        test.defineClass("Class1", code, 0, code.length);
    }
}

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