Question

求教Java里面如何反射invoke父类的overriden方法

Answer 1

import java.lang.reflect.Method;

public class InvokeTest {

public static void main(String[] args) {
Class<?> clazz;
Object obj;
try {
InvokeTest it = new InvokeTest();
clazz = Class.forName("com.test.invoke.User");
obj = clazz.newInstance();

Param p = new Param();
p.setMethodName("introduction");
p.setParamTypes(new Class<?>[]{String.class,int.class});
p.setParamValuese(new Object[]{"Tom",20});
Object result = it.call(obj, p);
System.out.println(result+"");

} catch (Exception e) {
e.printStackTrace();
}

}

/**
* 反射方法调用
* @param declareCLass classInstatnce
* @param param 参数设置类
* @return
* @throws Exception
*/
public Object call(Object declareCLass, Param param) throws Exception {
Class<?> clazz = declareCLass.getClass(); //获取class对象
String name = param.getMethodName(); //从param类中获取调用方法名
Class<?>[] methodParamTypes = param.getParamTypes(); //从param类中获取调用方法参数类型
Object[] objs = param.getParamValuese(); //从param类中获取调用方法参数值
Method method = clazz.getDeclaredMethod(name, methodParamTypes); //通过class对象获取对应的方法
return method.invoke(declareCLass, objs); //invoke调用方法，传入 classInstance、 参数值
}

}

/**
* 参数设置类
* @author Administrator
*
*/
class Param {
private String methodName;

private Class<?>[] paramTypes;

private Object[] paramValuese;

public String getMethodName() {
return methodName;
}

public void setMethodName(String methodName) {
this.methodName = methodName;
}

public Class<?>[] getParamTypes() {
return paramTypes;
}

public void setParamTypes(Class<?>[] paramTypes) {
this.paramTypes = paramTypes;
}

public Object[] getParamValuese() {
return paramValuese;
}

public void setParamValuese(Object[] paramValuese) {
this.paramValuese = paramValuese;
}
}

class User {

private String name;

private int age;

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
System.out.println("called method setName value = " + name);
}

public int getAge() {
return age;
}

public void setAge(int age) {
System.out.println("called method setAge value = " + age);
this.age = age;
}

public String introduction(String name,int age){
return "My name is "+name+". I'm "+age+" years old.";
}

}

Answer 2

Java反射-属性操作