package aReflection; import java.lang.reflect.Field; import java.lang.reflect.Modifier; public class Main { public static void main(String[] args) throws Exception { Student s = new Student(); Class cls = s.getClass(); Field f = cls.getField("name"); printFieldInfo(f); Field f1 = cls.getDeclaredField("address"); f1.setAccessible(true); printFieldInfo(f1); System.out.println(f.get(s)); f1.set(s, "Shanghai"); f1.set(null, 123); System.out.println(s.hello()); } private static void printFieldInfo(Field f) { System.out.println("field name: " + f.getName()); System.out.println("field type: " + f.getType()); System.out.println("field modifier: " + f.getModifiers()); System.out.println("is public? : " + Modifier.isPublic(f.getModifiers())); System.out.println("is private? : " + Modifier.isPrivate(f.getModifiers())); System.out.println("is protected? : " + Modifier.isProtected(f.getModifiers())); System.out.println("is static? : " + Modifier.isStatic(f.getModifiers())); System.out.println("is final? : " + Modifier.isFinal(f.getModifiers())); } }