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Articles on Trending Technologies
Technical articles with clear explanations and examples
What is the use of in flush() and close() methods of BufferedWriter class in Java?
The BufferedWriter class of Java is used to write stream of characters to the specified destination (character-output stream). It initially stores all the characters in a buffer and pushes the contents of the buffer to the destination, making the writing of characters, arrays and Strings efficient.You can specify the required size of the buffer at the time of instantiating this class.The flush() methodWhile you are trying to write data to a Stream using the BufferedWriter object, after invoking the write() method the data will be buffered initially, nothing will be printed.The flush() method is used to push the contents of ...
Read MoreWhy does Java strictly specify the range and behavior of its primitive types?
Java provides various datatypes to store various data values. It provides 7 primitive datatypes (stores single values) namely, boolean, byte, char, short, int, long, float, double.Java strictly specifies range and behaviors of all the primitive datatypes. Making the users choose the required datatypes based on the application thus reducing the unused occupancy of memory.For example, if you need to store an integer constant of single digit using integer would be a waste of memory instead, you can use byte type since 8 bits would be necessary to store it.ExampleFollowing Java example lists out the ranges of the primitive datatypes.public class ...
Read MoreList out the default values of numeric and non-numeric primitive data types in Java?
When you create instance variables in Java you need to initialize them, else the compiler will initialize on your behalf with default values which are −byte: 0short: 0int: 0long: 0float: 0.0double: 0.0boolean: falsestring: nullExampleIn the following Java program prints the default values of the numeric and non-numeric primitive variables in java.public class DefaultValues { byte byteVariable; short shortVariable; int intVariable; long longVaraible; float floatVariable; double doubleVariable; boolean boolVariable; String stringVariable; public static void main(String args[]){ DefaultValues obj = new DefaultValues(); System.out.println("Default values of numeric variables ...
Read MoreHow to call the constructor of a superclass from a constructor in java?
Whenever you inherit/extend a class, a copy of superclass’s members is created in the subclass object and thus, using the subclass object you can access the members of both classes.ExampleIn the following example we have a class named SuperClass with a method with name demo(). We are extending this class with another class (SubClass).Now, you create an object of the subclass and call the method demo().class SuperClass{ public void demo() { System.out.println("demo method"); } } public class SubClass extends SuperClass { public static void main(String args[]) { SubClass obj = new ...
Read MoreHow to set the date in datepicker dialog in android?
This example demonstrates about how do I set the date in datepicker dialog 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 projectStep 2 − Add the following code to res/layout/activity_main.xml. Step 3 − Add the following code to res/layout/DatePickerFragment.java (Right click on the package, click new – Java Class)import android.app.DatePickerDialog; import android.app.Dialog; import android.os.Bundle; import android.support.annotation.NonNull; import android.support.v4.app.DialogFragment; import java.util.Calendar; public class DatePickerFragment extends DialogFragment { @NonNull @Override public Dialog onCreateDialog(Bundle savedInstanceState) { ...
Read MoreWhere and how to use to static variables in android studio?
This example demonstrates about how and where do I use static variable in android studio.Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new projectStep 2 − Add the following code to res/layout/activity_main.xml. Step 3 − Add the following code to src/MainActivity.javaimport android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.util.Log; public class MainActivity extends AppCompatActivity { public static final String TAG = "I'm a Static Variable"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } ...
Read MoreHow to get the touch position on android device?
This example demonstrates about how do I get the touch position on android device.Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new projectStep 2 − Add the following code to res/layout/activity_main.xml. Step 3 − Add the following code to src/MainActivity.javapackage app.com.sample; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.MotionEvent; import android.view.View; import android.widget.EditText; import android.widget.TextView; public class MainActivity extends AppCompatActivity { TextView T; EditText E1, E2; float x = 0f; float y = 0f; ...
Read MoreHow to change color of Button in Android when Clicked?
This example demonstrates about How do I change the color of Button in Android when clicked.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.javaimport android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Button; public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); final Button button = findViewById(R.id.button); ...
Read MoreHow to detect airplane mode is on or off in Android?
This example demonstrates about How to detect airplane mode is on or off in AndroidStep 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 app.com.sample; import androidx.appcompat.app.AppCompatActivity; import android.content.Context; import android.os.Bundle; import android.provider.Settings; import android.widget.TextView; public class MainActivity extends AppCompatActivity { TextView textView; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); textView ...
Read MoreC++ Program for Zeckendorf's Theorem?
Here we will see how to check whether the given sum is found by adding some nonneighbouring Fibonacci numbers or not, if so, what are the numbers? For example if the give sum value is 10, this is sum of 8 and 2. Both 8 and 2 are Fibonacci terms and they are not adjacent. Let us see the algorithm to get the idea.AlgorithmnonNeighbourFibo(sum)Begin while sum > 0, do fibo := greatest Fibonacci term but not greater than sum print fibo sum := sum - fibo done EndExample#include using ...
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