jaav 类动态加载，static 语句块加载一次
package test.java;
/**
*
* @author lj
* @printout
* [Loaded test.java.A from file:/D:/Users/workspaceReal1/ptservice/build/classes/]
----------------------
[Loaded test.java.B from file:/D:/Users/workspaceReal1/ptservice/build/classes/]
[Loaded test.java.C from file:/D:/Users/workspaceReal1/ptservice/build/classes/]
static of CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
[Loaded test.java.D from file:/D:/Users/workspaceReal1/ptservice/build/classes/]
dynamic of DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD
dynamic of DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD
*/
public class TestDynamicLoading {
public static void main(String[] args) {
new A();//详细输出 -verbose:class,这个是动态加载。先加载A，再打印，第三句才加载B类。即classLoader 是用到的时候才动态加载类
System.out.println("----------------------");
new B();
new C();
new C();
new D(1);
new D(2);
}
}
class A{
}
class B{
}
class C{
static { //静态语句块，在加载类的时候加载，并且只被加载一次
System.out.println("static of CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC");
}
}
class D{
public D(int i){}
{ //动态语句块，在每次new 对象的时候调用,用的不多。这个与构造方法区别不大，仅当构造方法有参数时，才发现，这个无条件加在每个构造方法前面
System.out.println("dynamic of DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD");
}
}