Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
How to use clear() in android CopyOnWriteArraySet?
Before getting into example, we should know what CopyOnWriteArraySetis. It is a thread-safe variant of ArrayList and operations add, set, and so on by making a fresh copy of the underlying array.
This example demonstrate about How to use clear() in android CopyOnWriteArraySet
Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.
Step 2 − Add the following code to res/layout/activity_main.xml.
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:gravity="center" android:layout_height="match_parent" tools:context=".MainActivity" android:orientation="vertical"> <TextView android:id="@+id/actionEvent" android:textSize="40sp" android:layout_marginTop="30dp" android:layout_width="wrap_content" android:layout_height="match_parent" /> </LinearLayout>
In the above code, we have taken text view to show CopyOnWriteArraySet elements.
Step 3 − Add the following code to src/MainActivity.java
package com.example.myapplication;
import android.os.Build;
import android.os.Bundle;
import android.support.annotation.RequiresApi;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.TextView;
import java.util.Collections;
import java.util.concurrent.CopyOnWriteArraySet;
public class MainActivity extends AppCompatActivity {
CopyOnWriteArraySet copyOnWriteArraySet;
String head;
@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
copyOnWriteArraySet = new CopyOnWriteArraySet<String>();
final TextView actionEvent = findViewById(R.id.actionEvent);
copyOnWriteArraySet.add("sai");
copyOnWriteArraySet.add("ram");
copyOnWriteArraySet.add("krishna");
copyOnWriteArraySet.add("prasad");
copyOnWriteArraySet.add("ram");
actionEvent.setText("" + copyOnWriteArraySet);
actionEvent.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
copyOnWriteArraySet.clear();
actionEvent.setText(""+copyOnWriteArraySet);
}
});
}
}Let's try to run your application. I assume you have connected your actual Android Mobile device with your computer. To run the app from an android studio, open one of your project's activity files and click Run 
icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen −
Now click on text view, it will show the result as shown below −
Click here to download the project code
353 Views
