observable

可观察的类clearChanged()方法 (Observable Class clearChanged() method)

• clearChanged() method is available in java.util package.

  clearChanged()方法在java.util包中可用。

• clearChanged() method represents that this object has no longer changed or in other words, we can say it has previously notified all of the observers of its most recent change.

  clearChanged()方法表示此对象不再更改，或者换句话说，我们可以说它先前已将其最新更改通知了所有观察者。

• clearChanged() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.

  clearChanged()方法是一个非静态方法，只能通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。

• clearChanged() method does not throw an exception at the time of requiring to changes the object.

  clearChanged()方法在要求更改对象时不会引发异常。

Syntax:

句法：

    public void clearChanged();

Parameter(s):

参数：

• It does not accept any parameter.

  它不接受任何参数。

Return value:

返回值：

The return type of the method is void, it returns nothing.

该方法的返回类型为void ，不返回任何内容。

Example:

例：

// Java program to demonstrate the example
// of void clearChanged() method of Observable
import java.util.*;
// Implement Observers class
class Observers implements Observer {public void update(Observable obj, Object ob) {System.out.println("Obs is added");
}
}
// Implement Observed Class
class Observed extends Observable {// Function call with setChanged()
void setChange() {setChanged();
System.out.println("setChanged(): " + hasChanged());
notifyObservers();
}
// Function call without setChanged()
void clearChange() {setChanged();
System.out.println("clearChanged(): ");
// By using clearChanged() method isto
// unset all the changes done by setChanged()
clearChanged();
notifyObservers();
}
}
public class ClearChanged {// Implement Main Method
public static void main(String args[]) {Observed observed = new Observed();
Observers obs = new Observers();
observed.addObserver(obs);
observed.setChange();
observed.clearChange();
}
}

Output

输出量

setChanged(): true
Obs is added
clearChanged():

翻译自: https://www.includehelp.com/java/observable-clearchanged-method-with-example.aspx

observable