一个测试接口加载,类加载很好的例子

来源：互联网发布：阿里云做代理服务器编辑：程序博客网时间：2024/04/28 03:14

//---------------------------------------------------------------------------
//-------------------------------程序开始--------------------------------
//---------------------------------------------------------------------------
public class Test {
    public static void main(String[] args) {
        Subclass sb = new Subclass();
    }
}

class Sssuper {
    int i = -1; // for debug can delete
    static {
        System.out.println(1);
    }
    Sssuper(int i) {
        System.out.println(i);
        this.i = i; // for debug can delete
    }
}

class Subclass extends Sssuper implements Interface {
    static {
        System.out.println(2);
    }
    Sssuper su = new Sssuper(4);

    Subclass() {
        super(3);
        //System.out.println(su1.i+1); // for debug can delete
        new Sssuper(5);
    }
}

interface Interface {
static Sssuper su1 = new Sssuper(0);
}

//---------------------------------------------------------------------------
//-------------------------------程序结束--------------------------------
//---------------------------------------------------------------------------

运行结论：
根据测试结果,得知在接口Interface中的实例su1并不会在运行时加载,当把//System.out.println(su1.i+1);
// for debug can delete 放开后su1才开始加载.这个例子可以帮助我们很好地理解“接口、继承，静态块之间的运行关系”。