老生常谈反射之Class类的使用(必看篇)

Class c1 = Foo.class; 

Foo foo1 = new Foo(); 2 Class c2 = foo1.getClass(); 

Class c3 = null;try {  c3 = Class.forName("com.format.test.Foo");} catch (ClassNotFoundException e) {  e.printStackTrace();}

try {  Foo foo2 = (Foo) c1.newInstance(); //需要有无参构造} catch (InstantiationException e) {  e.printStackTrace();} catch (IllegalAccessException e) {  e.printStackTrace();}