如何使用反射访问类的private域和方法
如何使用反射访问类的private域和方法？非常简单，由于Field和Method均继承AccessibleObject，只需要调用AccessibleObject的public void setAccessible(boolean flag) throws SecurityException 方法设置为setAccessible(true)即可。具体见下列代码
import java.lang.reflect.Field;import java.lang.reflect.Method;public class ReflectTest {public static void main(String[] args) throws Exception {PrivateClass pri = (PrivateClass) Class.forName("PrivateClass").newInstance();Field field = Class.forName("PrivateClass").getDeclaredField("priField");try {field.set(pri, "youareprivate?");pri.getPriField();} catch (Exception e) {System.out.println(e.getMessage());}field.setAccessible(true);field.set(pri, "youareprivate?");pri.getPriField();Method method = Class.forName("PrivateClass").getDeclaredMethod("priMethod", new Class[] {});try {method.invoke(pri, new Object[] {});} catch (Exception e) {System.out.println(e.getMessage());}method.setAccessible(true);method.invoke(pri, new Object[] {});}}class PrivateClass {private String priField = "priField ";public void getPriField() {System.out.println(" the value of priField is " + priField);}private void priMethod() {System.out.println("call the private method!");}}
结果：
Class ReflectTest can not access a member of class PrivateClass with modifiers "private" the value of priField is youareprivate?Class ReflectTest can not access a member of class PrivateClass with modifiers "private"call the private method!
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