import java.lang.reflect.Field ;import java.lang.reflect.Method ;
import java.lang.reflect.Constructor ;
public class
ReflectionExample
{public static void
main
( String [ ]args
) throws Exception {// 获取 Class 对象
Class
<?>clazz
=Car.
class ;// 创建 Car 对象
Constructor
<?>constructor
=clazz.
getConstructor ( String.
class,
int.
class ) ;Object
car
=constructor.
newInstance ( "Toyota",
2020 ) ;// 访问和修改字段
Field
modelField
=clazz.
getDeclaredField ( "model" ) ;Field
yearField
=clazz.
getDeclaredField ( "year" ) ;
// 设置字段为可访问（如果字段是私有的）
modelField.
setAccessible ( true ) ;yearField.
setAccessible ( true ) ;
// 打印原始字段值
System
.
out.
println ( "Original Model: " +modelField.
get (car
) ) ;System
.
out.
println ( "Original Year: " +yearField.
get (car
) ) ;
// 修改字段值
modelField.
set (car,
"Honda" ) ;yearField.
set (car,
2024 ) ;
// 打印修改后的字段值
System
.
out.
println ( "Updated Model: " +modelField.
get (car
) ) ;System
.
out.
println ( "Updated Year: " +yearField.
get (car
) ) ;
// 调用方法
Method
startMethod
=clazz.
getMethod ( "start" ) ;startMethod.
invoke (car
) ;}
}
class
Car
{private String
model
;private int
year
;public
Car
( Stringmodel,
intyear
) {this
.
model =model
;this
.
year =year
;}
public void
start
( ) {System
.
out.
println ( "The " +model
+ " car of year " +year
+ " is starting." ) ;}
}
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