Method方法学习

 

package hb.util;import java.util.Date;public class Person {private String name;private String password;private Date birthday;public Date getBirthday() {return birthday;}public void setBirthday(Date birthday) {this.birthday = birthday;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}public String print(Person person){System.out.println("姓名：" + person.name + "密码：" + person.password + "生日" + person.birthday);return "姓名：" + person.name + "密码：" + person.password + "生日" + person.birthday;}}

 

 

package hb.util;import java.lang.reflect.InvocationTargetException;import java.lang.reflect.Method;public class ParamObject {private Object instance;private String method;public ParamObject(Object instance,String method){this.instance = instance;this.method = method;}public Object execute() throws SecurityException, NoSuchMethodException, IllegalArgumentException, IllegalAccessException, InvocationTargetException{Class cls = instance.getClass();Method md = cls.getMethod(this.method, null);//得到字符串为this.method的方法，并且没有参数return md.invoke(instance, null);}}

 

 

package hb.util;import java.lang.reflect.InvocationTargetException;import java.util.Date;public class TestParamObject {public static void main(String[] args) throws SecurityException, IllegalArgumentException, NoSuchMethodException, IllegalAccessException, InvocationTargetException {Person person = new Person();person.setName("name");person.setPassword("person");person.setBirthday(new Date());//得到字符串ParamObject param = new ParamObject(person, "getPassword");if(param.execute() instanceof String){System.out.println("返回的结果是String 类型");System.out.println(param.execute());}else{System.out.println("返回的结果不是String 类型");}//得到非字符串ParamObject param1 = new ParamObject(person, "getBirthday");if(param1.execute() instanceof String){System.out.println("返回的结果是String 类型");System.out.println(param1.execute());}else{System.out.println("返回的结果不是String 类型");System.out.println(param1.execute());}}}

 

 

package hb.util;import java.lang.reflect.InvocationTargetException;import java.lang.reflect.Method;import java.util.Date;public class TestMethodInvoke {public static void main(String[] args) throws SecurityException, NoSuchMethodException, IllegalArgumentException, IllegalAccessException, InvocationTargetException {Person person = new Person();person.setName("name");person.setPassword("person");person.setBirthday(new Date());//得到方法名字是print,参数是Person类型的方法Method md = person.getClass().getMethod("print", Person.class);md.invoke(person, person);//执行第一个person对象的的print方法，传递第二个person作为参数if(md.invoke( person, person) instanceof String){System.out.println("返回的是String 类型");}}}