package com.eebbk.reflectdemo;
public class Person{
String mName;
String mSex;
public int mAge;
public Person(String aName, String aSex, int aAge) {
mName = aName;
mSex = aSex;
mAge = aAge;
}
public int getmAge(){
return mAge;
}
public void setmAge(int mAge){
this.mAge = mAge;
}
public String getmName(){
return mName;
}
public void setmName(String mName){
this.mName = mName;
}
public String getmSex(){
return mSex;
}
public void setmSex(String mSex){
this.mSex = mSex;
}
private String getDescription(){
return "黄种人";
}
}
package com.eebbk.reflectdemo;
public interface ICompany{
String getCompany();
}
package com.eebbk.reflectdemo;
public class ProgramMonkey extends Person implements ICompany{
String mLanguage = "C#";
String mCompany = "BBK";
public ProgramMonkey(String aName, String aSex, int aAge){
super(aName, aSex, aAge);
}
public ProgramMonkey(String language, String company, String aName, String aSex, int aAge){
super(aName, aSex, aAge);
mLanguage = language;
mCompany = company;
}
public String getmLanguage(){
return mLanguage;
}
public void setmLanguage(String mLanguage){
this.mLanguage = mLanguage;
}
private int getSalaryPerMonth(){
return 12306;
}
@Override
public String getCompany(){
return mCompany;
}
}
public class ReflectActivity extends Activity{
@Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_reflect_layout);
}
public void onClick(View v){
switch(v.getId()){
case R.id.getClassObjectBtnId:{
getClassObject();
}
break;
case R.id.getMethodInfoBtnId:{
getMethodInfo();
}
break;
case R.id.getFieldInfoBtnId:{
getFieldInfo();
}
break;
case R.id.getSuperClassInfoBtnId:{
getSuperClass();
}
break;
case R.id.getInterfaceInfoBtnId:{
getInterfaces();
}
break;
case R.id.compareMethodAndFieldBtnId:{
compareCallMethodAndField();
}
break;
default:{
}
break;
}
}
private void getClassObject(){
Class<?> classObject = null;
classObject = getClassObject_1();
LogE("classObject_1 name : " classObject.getName());
classObject = getClassObject_2();
LogE("classObject_2 name : " classObject.getName());
classObject = getClassObject_3();
LogE("classObject_3 name : " classObject.getName());
}
private void getMethodInfo(){
getAllMethods();
getCurrentClassMethods();
}
private void getFieldInfo(){
getAllFields();
getCurrentClassFields();
}
private void getSuperClass(){
ProgramMonkey programMonkey = new ProgramMonkey("小明", "男", 12);
Class<?> superClass = programMonkey.getClass().getSuperclass();
while (superClass != null) {
LogE("programMonkey's super class is : " superClass.getName());
// 再获取父类的上一层父类，直到最后的 Object 类，Object 的父类为 null
superClass = superClass.getSuperclass();
}
}
private void getInterfaces() {
ProgramMonkey programMonkey = new ProgramMonkey("小明", "男", 12);
Class<?>[] interfaceses = programMonkey.getClass().getInterfaces();
for (Class<?> class1 : interfaceses) {
LogE("programMonkey's interface is : " class1.getName());
}
}
private void compareCallMethodAndField(){
long callMethodCostTime = getCallMethodCostTime(10000);
LogE("callMethodCostTime == " callMethodCostTime);
long callFieldCostTime = getCallFieldCostTime(10000);
LogE("callFieldCostTime == " callFieldCostTime);
}
private long getCallMethodCostTime(int count){
long startTime = System.currentTimeMillis();
for(int index = 0 ; index < count; index ){
ProgramMonkey programMonkey = new ProgramMonkey("小明", "男", 12);
try{
Method setmLanguageMethod = programMonkey.getClass().getMethod("setmLanguage", String.class);
setmLanguageMethod.setAccessible(true);
setmLanguageMethod.invoke(programMonkey, "Java");
}catch(IllegalAccessException e){
e.printStackTrace();
}catch(InvocationTargetException e){
e.printStackTrace();
}catch(NoSuchMethodException e){
e.printStackTrace();
}
}
return System.currentTimeMillis()-startTime;
}
private long getCallFieldCostTime(int count){
long startTime = System.currentTimeMillis();
for(int index = 0 ; index < count; index ){
ProgramMonkey programMonkey = new ProgramMonkey("小明", "男", 12);
try{
Field ageField = programMonkey.getClass().getDeclaredField("mLanguage");
ageField.set(programMonkey, "Java");
}catch(NoSuchFieldException e){
e.printStackTrace();
}catch(IllegalAccessException e){
e.printStackTrace();
}
}
return System.currentTimeMillis()-startTime;
}
/**
* 获取当前类中的所有方法
*
* */
private void getCurrentClassMethods() {
ProgramMonkey programMonkey = new ProgramMonkey("小明", "男", 12);
Method[] methods = programMonkey.getClass().getDeclaredMethods();
for (Method method : methods) {
LogE("declared method name : " method.getName());
}
try {
Method getSalaryPerMonthMethod = programMonkey.getClass().getDeclaredMethod("getSalaryPerMonth");
getSalaryPerMonthMethod.setAccessible(true);
// 获取返回类型
Class<?> returnType = getSalaryPerMonthMethod.getReturnType();
LogE("getSalaryPerMonth 方法的返回类型 : " returnType.getName());
// 获取方法的参数类型列表
Class<?>[] paramClasses = getSalaryPerMonthMethod.getParameterTypes() ;
for (Class<?> class1 : paramClasses) {
LogE("getSalaryPerMonth 方法的参数类型 : " class1.getName());
}
// 是否是 private 函数，属性是否是 private 也可以使用这种方式判断
LogE(getSalaryPerMonthMethod.getName() " is private " Modifier.isPrivate(getSalaryPerMonthMethod.getModifiers()));
// 执行方法
Object result = getSalaryPerMonthMethod.invoke(programMonkey);
LogE("getSalaryPerMonth 方法的返回结果: " result);
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 获取当前类和父类的所有公有方法
*
* */
private void getAllMethods() {
ProgramMonkey programMonkey = new ProgramMonkey("小明", "男", 12);
// 获取当前类和父类的所有公有方法
Method[] methods = programMonkey.getClass().getMethods();
for (Method method : methods) {
LogE("method name : " method.getName());
}
try {
Method setmLanguageMethod = programMonkey.getClass().getMethod("setmLanguage", String.class);
setmLanguageMethod.setAccessible(true);
// 获取返回类型
Class<?> returnType = setmLanguageMethod.getReturnType();
LogE("setmLanguage 方法的返回类型 : " returnType.getName());
// 获取方法的参数类型列表
Class<?>[] paramClasses = setmLanguageMethod.getParameterTypes() ;
for (Class<?> class1 : paramClasses) {
LogE("setmLanguage 方法的参数类型 : " class1.getName());
}
// 是否是 private 函数，属性是否是 private 也可以使用这种方式判断
LogE(setmLanguageMethod.getName() " is private " Modifier.isPrivate(setmLanguageMethod.getModifiers()));
// 执行方法
Object result = setmLanguageMethod.invoke(programMonkey, "Java");
LogE("setmLanguage 方法的返回结果: " result);
} catch (Exception e) {
e.printStackTrace();
}
}
private Class<?> getClassObject_1(){
return ProgramMonkey.class;
}
private Class<?> getClassObject_2(){
ProgramMonkey programMonkey = new ProgramMonkey("小明", "男", 12);
return programMonkey.getClass();
}
private Class<?> getClassObject_3(){
try{
return Class.forName("com.eebbk.reflectdemo.ProgramMonkey");
}catch(ClassNotFoundException e){
e.printStackTrace();
}
return null;
}
/**
* 得到当前类的所有实例
*
* */
private void getCurrentClassFields() {
ProgramMonkey programMonkey = new ProgramMonkey("小明", "男", 12);
// 获取当前类的所有属性
Field[] publicFields = programMonkey.getClass().getDeclaredFields();
for (Field field : publicFields) {
LogE("declared field name : " field.getName());
}
try {
// 获取当前类的某个属性
Field ageField = programMonkey.getClass().getDeclaredField("mAge");
// 获取属性值
LogE(" my age is : " ageField.getInt(programMonkey));
// 设置属性值
ageField.set(programMonkey, 10);
LogE(" my age is : " ageField.getInt(programMonkey));
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 得到当前类和父类的所有公有属性
*
* */
private void getAllFields() {
ProgramMonkey programMonkey = new ProgramMonkey("小明", "男", 12);
// 得到当前类和父类的所有公有属性
Field[] publicFields = programMonkey.getClass().getFields();
for (Field field : publicFields) {
LogE("field name : " field.getName());
}
try {
// 获取当前类和父类的某个公有属性
Field ageField = programMonkey.getClass().getField("mAge");
LogE(" age is : " ageField.getInt(programMonkey));
ageField.set(programMonkey, 8);
LogE(" my age is : " ageField.getInt(programMonkey));
} catch (Exception e) {
e.printStackTrace();
}
}
private void LogE(String msg){
Log.e("Reflection", "============== " msg);
}
}