SUN认证考试知识点：Java反射机制的应用
目标：用一个代理类实现两个相似类的调用
1.两个相似类
Man类
Women类：
代理类：
package Reflect;
import java.lang.reflect.Method;
public class Person { //代理类
private Object target; //目标对象
private String methodName; //目标方法
private Object[] params; //参数数组
private Method method;
public Object getTarget() {
return target;
}
public void setTarget(Object target) {
this.target = target;
}
public String getMethodName() {
return methodName;
}
public void setMethodName(String methodName) {
this.methodName = methodName;
}
public Object[] getParams() {
return params;
}
public void setParams(Object[] params) {
this.params = params;
}
public Person(){
}
/**
* _重新设置目标方法
*/
private void reSetMethod(String methodName){
if(params!=null){ //目标方法有参数
int paramsLength = params.length;
Class[] paramsTypes = new Class[paramsLength];
for(int i=0;i
paramsTypes[i] = params[i].getClass();
}
try {
method = target.getClass().getMethod(methodName,paramsTypes);
} catch (SecurityException e) {
e.printStackTrace();
} catch (NoSuchMethodException e) {
e.printStackTrace();
}
}
else //目标方法参数为null
{
try {
method = target.getClass().getMethod(methodName,null);
} catch (SecurityException e) {
e.printStackTrace();
} catch (NoSuchMethodException e) {
e.printStackTrace();
}
}
}
/**
* _重新设置目标对象和方法
*/
private void reSetTarget(Object target,String methodName){
this.target = target;
this.reSetMethod(methodName);
}
/**
* _动态调用已绑定方法
*/
public void doMethod() throws Exception{
reSetTarget(target,methodName);
this.method.invoke(target, params);
}
}
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