observable

可觀察的類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()方法表示此對象不再更改，或者換句話說，我們可以說它先前已將其最新更改通知了所有觀察者。

• 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()方法是一個非靜態方法，只能通過類對象訪問，如果嘗試使用類名稱訪問該方法，則會收到錯誤消息。

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

  clearChanged()方法在要求更改對象時不會引發異常。

Syntax:

句法：

public void clearChanged();

Parameter(s):

參數：

• It does not accept any parameter.

  它不接受任何參數。

Return value:

返回值：

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

該方法的返回類型為void ，不返回任何內容。

Example:

例：

// Java program to demonstrate the example // of void clearChanged() method of Observableimport 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 Methodpublic static void main(String args[]) {Observed observed = new Observed();Observers obs = new Observers();observed.addObserver(obs);observed.setChange();observed.clearChange();} }

Output

輸出量

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

翻譯自: https://www.includehelp.com/java/observable-clearchanged-method-with-example.aspx

observable

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