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A specific key can be used to search for the required property in the property list using the method getProperty() in the class java.security.Provider. This method requires a single parameter i.e. the key required to search for the property. It returns the property value for the key or returns null if the property value is not available.A program that demonstrates this is given as follows −Example Live Demoimport java.security.*; import java.util.*; public class Demo { public static void main(String[] argv) throws Exception { try { KeyPairGenerator kpGenerator = KeyPairGenerator.getInstance("DSA"); ... Read More
This example demonstrates How to read a txt file in external storage with runtime permission in android (we have already created a folder called text and sample txt file in external storage).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. In the above code, we have taken textview and button. When user click on button, it will take data from external storage and append the data to text view.Step 3 ... Read More
This example demonstrate about How to save cache in local storage of android webview.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. In the above code, we have taken web view to show facebook.com.Step 3 − Add the following code to src/MainActivity.javapackage com.example.myapplication; import android.app.ProgressDialog; 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.webkit.WebChromeClient; import android.webkit.WebSettings; import android.webkit.WebView; import android.webkit.WebViewClient; import android.widget.EditText; public class MainActivity extends AppCompatActivity ... Read More
This example demonstrates How to verify an action bar is showing or not in android.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. In the above code, we have taken text view to action bar status.Step 3 − Add the following code to src/MainActivity.javapackage com.example.myapplication; import android.annotation.SuppressLint; import android.app.ActivityManager; import android.app.admin.DevicePolicyManager; import android.content.ComponentName; import android.content.Context; import android.content.Intent; import android.net.wifi.WifiInfo; import android.net.wifi.WifiManager; import android.os.Build; import android.os.Bundle; import android.support.annotation.RequiresApi; import android.support.v7.app.AppCompatActivity; import android.view.MenuItem; import ... Read More
To get the string representation of the CopyOnWriteArrayList, use the toString() method in Java.The syntax is as followsString toString()To work with CopyOnWriteArrayList class, you need to import the following packageimport java.util.concurrent.CopyOnWriteArrayList;The following is an example to implement CopyOnWriteArrayList class toString() method in JavaExample Live Demoimport java.util.concurrent.CopyOnWriteArrayList; public class Demo { public static void main(String[] args) { CopyOnWriteArrayList arrList = new CopyOnWriteArrayList(); arrList.add(100); arrList.add(250); arrList.add(0, 400); arrList.add(1, 500); arrList.add(2, 650); arrList.add(700); arrList.add(800); System.out.println("CopyOnWriteArrayList String Representation = " + arrList.toString()); } }OutputCopyOnWriteArrayList String Representation = [400, 500, 650, 100, 250, 700, 800]
An immutable copy of a LocalTime with the nanoseconds altered as required is done using the method withNano() in the LocalTime class in Java. This method requires a single parameter i.e. the nanosecond that is to be set in the LocalTime and it returns the LocalTime with the nanosecond altered as required.A program that demonstrates this is given as follows −Example Live Demoimport java.time.*; public class Main { public static void main(String[] args) { LocalTime lt1 = LocalTime.parse("23:15:30"); System.out.println("The LocalTime is: " + lt1); LocalTime lt2 = lt1.withNano(5); ... Read More
To retrieve time as HH:MM format, use the DATE_FORMAT() function. To understand the function and retrieve time, let us create a table.The query to create a table is as followsmysql> create table retrieveTimeDemo -> ( -> UserId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> UserArrivalTime datetime -> ); Query OK, 0 rows affected (0.57 sec)Insert some records in the table using insert command.The query is as followsmysql> insert into retrieveTimeDemo(UserArrivalTime) values('2013-01-21 13:45:34'); Query OK, 1 row affected (0.16 sec) mysql> insert into retrieveTimeDemo(UserArrivalTime) values('2014-11-25 11:40:56'); Query OK, 1 row affected (0.11 sec) mysql> insert into retrieveTimeDemo(UserArrivalTime) ... Read More
Insert an element into IntStream using the IntStream.Builder accept() method. It adds element to the stream being built.The syntax is as follows:void accept(int t)Here, parameter t is the input argument.The elements are inserted as shown below in the stream:builder.accept(10); builder.accept(15); builder.accept(25); builder.accept(39); builder.accept(45);The following is an example to implement IntStream.Builder accept() method in Java:Example Live Demoimport java.util.stream.IntStream; public class Demo { public static void main(String[] args) { IntStream.Builder builder = IntStream.builder(); System.out.println("Elements of the stream..."); builder.accept(10); builder.accept(15); builder.accept(25); builder.accept(39); ... Read More
Stack and heap are used to store variables during the execution of the program and it also get destroyed.Global data structures or global variables are not consumed by stack or heap. They basically allocated in a fixed memory block, which remains unchanged.int a[10]; // located in a fixed memory block int main() { int main() { float *ptr = (int *)malloc(sizeof(float)10.0)); //use heap. } }
This example demonstrate about How to send data from one activity to another in Android without intent.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. Step 3 − Add the following code to src/MainActivity.javapackage com.example.myapplication; import android.content.Intent; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.view.View; import android.widget.Button; import android.widget.EditText; public class MainActivity extends AppCompatActivity { private static String value; public static String getValue() { return value; ... Read More