继承1st

代码1

package FirstPackage;

public class Extend1 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Zi a=new Zi();
		a.show();

	}

}
class Fu{
	public int num = 10;
	public Fu(){
		System.out.println("fu");
	}
}
class Zi extends Fu{
	public int num = 20;
	public Zi(){
		System.out.println("zi");
	}
	public void show(){
		int num = 30;
		System.out.println(num);
		System.out.println(this.num);
		System.out.println(super.num);
	}
}

输出：
fu
zi
30
20
10

1. 第一父类，第二子类
2. 局部，this，super

代码2

package FirstPackage;

public class Extend2 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Zi a=new Zi();
	}

}
class Fu {
	static {
		System.out.println("静态代码块Fu");
	}
	{
		System.out.println("构造代码块Fu");
	}
	public Fu() {
		System.out.println("构造方法Fu");
	}
}
class Zi extends Fu {
	static {
		System.out.println("静态代码块Zi");
	}
	{
		System.out.println("构造代码块Zi");
	}
	public Zi() {
		System.out.println("构造方法Zi");
	}
}
输出：
静态代码块Fu
静态代码块Zi
构造代码块Fu
构造方法Fu
构造代码块Zi
构造方法Zi

1. 第一父类，第二子类
2. 先静态，后其他