java 中newInstance()方法和new关键字的区别

import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; import java.lang.reflect.Field;  public class testInvoke {   public void work(){     System.out.println("-----------");   }    public testInvoke work(String a,Integer b){     System.out.println(a + b);     return this;   }   public void work(Integer b, int c ){     System.out.println(b + c);   }      public static void main(String[] args) throws SecurityException, NoSuchMethodException, InstantiationException,     IllegalAccessException, IllegalArgumentException, InvocationTargetException{     Class<?> clazz = testInvoke.class;     //Class<?> clazz = Class.forName("invoke.testInvoke");     //testInvoke tinvoke = new testInvoke(); Class<?> clazz = tinvoke.getClass();      System.out.println(clazz);     //如果源类的方法没有参数，则要用new Class[]{}     Method method1 = clazz.getMethod("work", new Class[]{});     Method method2 = clazz.getMethod("work", new Class[]{String.class, Integer.class});      Method method3 = clazz.getMethod("work", new Class[]{Integer.class, int.class});     Object invokeTest = clazz.newInstance();          //invoke方法的第一个参数是源类的实例，第二个参数是实例的值     Object result1 = method1.invoke(invokeTest, new Object[]{});     Object result2 = method2.invoke(invokeTest, new Object[]{"aaaa",new Integer(10)});     Object result3 = method3.invoke(invokeTest, new Object[]{3,new Integer(4)});     System.out.println(result1);     System.out.println(result2);     System.out.println(result3);      Method[] methods = clazz.getMethods();     for(Method method : methods){       System.out.println(method.getName());     }          Field[] fileds = clazz.getFields();     for(Field filed: fileds){       System.out.println(filed.getName());     }   } }