java学习笔记

class A
{
    public static final int VAL = 3; // 不会导致A被加载
    static
    {
        System.out.println("load A");
    }
    public A()
    {
        System.out.println("create A");
    }
}
class B
{
    public static final A AOBJ = new A(); //会导致B被加载
    static
    {
        System.out.println("load B");
    }
    public B()
    {
        System.out.println("create B");
    }
}
public class Test
{
    public static void main(String[] args)
    {
        System.out.println(A.VAL);
        System.out.println("---------------------");
        System.out.println(B.AOBJ);
    }
}

 

 

package com.tone.test;

public class Parent
{
    public String name = "Kola";
    
    public void call()
    {
        sayHello(this.name);
    }
    public void sayHello(String name)
    {
        System.out.println("parent: " + name);
    }
}



package com.tone.test;

public class Child extends Parent
{
    public String name = "Tom";
    
    public Child()
    {
        super.name += "#";
        System.out.println("===== " + super.name + ", " + name + " =====");
    }
    public void sayHello(String name)
    {
        System.out.println("child: " + name);
    }
    public static void main(String[] args)
    {
        new Child().call();
    }
}


===== Kola#, Tom =====
child: Kola#