随便记两笔Java中的反射

1. 声明对象（调用无参的构造函数）

Java代码

1. Class<?> clz = Class.forName("package.ClassName");
2. Object obj = clz.newInstance();

Class<?> clz = Class.forName("package.ClassName");Object obj = clz.newInstance();

2. 声明方法

Java代码

1. Class<?> clz = Class.forName("package.ClassName");
3. Method method1 = clz.getMethod("method_without_parameter");
4. method1.invoke(obj);
6. Method method2 = clz.getMethod("method_with_parameter", String.Class);
8. Object obj = clz.newInstance();
9. method2.invoke(obj, "hello");

Class<?> clz = Class.forName("package.ClassName");Method method1 = clz.getMethod("method_without_parameter");method1.invoke(obj);Method method2 = clz.getMethod("method_with_parameter", String.Class);Object obj = clz.newInstance();method2.invoke(obj, "hello");

3. 参数为数组

Java代码

1. Class<?> clz = Class.forName("package.ClassName");
3. Class[] cl = new Class[1];
4. cl[0] = String[].class;
5. Method method = clz.getMethod("run", cl);
7. Object[] in = new Object[1];
8. String[] param = new String[1];
9. param[0] = "hello";
10. in[0] = param;
12. Object obj = clz.newInstance();
13. method.invoke(obj, in);