Java学习-sgg-day13-20200429

# Java的属性赋值的先后顺序

 

public class Attribute {

	public static void main(String[] args) {
		
		Order order = new Order();
		System.out.println(order.orderId);
		
	}
}

class Order{
	
	{
		orderId = 4;
	}
	
	int orderId = 3;
	
}

# Java被final修饰的语法

 

 

# Java中的抽象类和抽象方法