current.java

java中最响当当的模式：观察者模式

/**
do current
*/
public class Current implements Observer, DisplayShare
{
	private double charge;
    private AbsSubject myShare;



    public Current(AbsSubject myShare)
    {
        /*register to the distributor*/
		this.myShare=myShare;
		this.myShare.registerObserver(this);
	}
	/*easy to understand*/
	public void update(double charge)
	{
		this.charge=charge;
		display();
	}
	/*display*/
	public void display()
	{
		System.out.println("\nThe current charge of this Share is "+charge);
	}
}