test

 

 

package com.interview.testclassload;

/**
 * Created by Germmy on 2020/1/6.
 */
public class Line {

    static {
        System.out.println("静态代码块 loading line...");
    }

}

 

 

 

package com.interview.testclassload;

/**
 * Created by Germmy on 2020/1/6.
 */
public class Point {

    static {
        System.out.println("静态代码块,loading point...");
    }


    public void sayHello(){
        System.out.println("hello point");
    }

}

 

package com.interview.testclassload;

/**
 * Created by Germmy on 2020/1/6.
 */
public class ClassLoaderAnd4NameTest {

    public static void main(String[] args) throws ClassNotFoundException, InstantiationException, IllegalAccessException {

        String name4Line="com.interview.testclassload.Line";
        String name4Point="com.interview.testclassload.Point";

        test4ClassLoader(name4Line);
        test4ClassLoader(name4Point);

        System.out.println("--------------");

        test4ClassName(name4Line);
        test4ClassName(name4Point);


    }


    private static void test4ClassLoader(String name) throws ClassNotFoundException, IllegalAccessException, InstantiationException {

        ClassLoader systemClassLoader = ClassLoader.getSystemClassLoader();
        Class<?> aClass = systemClassLoader.loadClass(name);//还有个指定是否解析的方法，是受保护的，老衲访问不了

        String name1 = aClass.getName();
//        Object o = aClass.newInstance();
        System.out.println("class4Loader :"+name1);

//        if( o instanceof Point){
//            ((Point) o).sayHello();
//            System.out.println("我找到了它的原始方法啦，哈哈哈");
//        }


    }

    private static void test4ClassName(String name) throws ClassNotFoundException {
        Class<?> aClass = Class.forName(name);
        String name1 = aClass.getName();
        System.out.println("class4Name :"+name1);
    }




}