x");
ff3.setAccessible(true);
System.out.println(ff3.get(f1)+"");
/**
* 利用反射改变值
* 将f1对象中所有的成员变量中含有的a变为b
*/
Field[] fields = f1.getClass().getFields();
for (Field field: fields) {
if (field.getType()==String.class) {
String priValue = (String) field.get(f1);
String newValue = priValue.replace('a', 'b');
field.set(f1, newValue);
}
}
System.out.println(f1);
/**
* 获取方法
* 调用方法
*/
//new String().charAt(index)
Method methodCharat=String.class.getMethod("charAt", int.class);
System.out.println(methodCharat.invoke(str2, 1));
//System.out.println(methodCharat.invoke(null, 1));//表明是一个静态方法
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SecurityException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (NoSuchMethodException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InstantiationException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InvocationTargetException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (NoSuchFieldException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
利用反射调用其它类的main（）方法
class TestArguments{
public static void main(String[] args){
for(String arg : args){
System.out.println(arg);
}
}
}
//TestArguments.main(new String[]{"111","222","333"});
String startingClassName = args[0];
Method mainMethod = Class.forName(startingClassName).getMethod("main", String[].class);
//mainMethod.invoke(null, new Object[]{new String[]{"111","222","333"}});
mainMethod.invoke(null, (Object)new String[]{"111","222","333"});