java list get first element

ByAnurag batra October 4, 2022September 6, 2022

final Object firstElement = list.stream()
  .findFirst()
  .orElse(new Object()) //Give a default value if there are no elements
  
final Object firstElement = list.stream()
  .findFirst()
  .orElseThrow(() -> new Exception()) //Throw an exception if there are no elements

Here is what the above code is Doing:
1. We’re creating a list of strings.
2. We’re creating a stream from the list.
3. We’re using the findFirst() method to get the first element of the stream.
4. We’re using the orElse() method to provide a default value if the stream is empty.
5. We’re using the orElseThrow() method to throw an exception if the stream is empty.

Java Examples

floatingactionbutton image color

ByAnurag batra October 5, 2022September 6, 2022

app:tint=”@android:color/white” Here is what the above code is Doing: 1. We are setting the background color of the toolbar to the colorPrimaryDark color. 2. We are setting the title text color to white. 3. We are setting the navigation icon to the white color. 4. We are setting the overflow icon to the white color….

Java Examples

java quotes in string

ByAnurag batra September 17, 2022September 6, 2022

String value = “\”ROM\””; Here is what the above code is Doing: 1. We’re creating a new instance of the class called “my_dict” 2. We’re adding a key called “name” and a value called “John” to the dictionary 3. We’re adding a key called “age” and a value called “36” to the dictionary 4. We’re…

Java Examples

java memory cleaner

ByAnurag batra October 11, 2022September 6, 2022

For Minecraft: if(timeHelper.hasReached(300000)) { System.gc(); timeHelper.reset(); } Here is what the above code is Doing: 1. Create a TimeHelper object. 2. Check if the TimeHelper object has reached 300000 milliseconds. 3. If it has, call System.gc() to run the garbage collector. 4. Reset the TimeHelper object.

how to check grant permissions in android

Java Examples

how to check grant permissions in android

ByAnurag batra October 11, 2022September 6, 2022

if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) { // Do something … } Here is what the above code is Doing: 1. First, we check if the user has granted the app the ACCESS_FINE_LOCATION permission. 2. If the app has the permission, then the method returns PackageManager.PERMISSION_GRANTED and the app can proceed with the operation. 3. If…

jks not found when trying googlenethttptransport

Java Examples

jks not found when trying googlenethttptransport

ByAnurag batra October 11, 2022September 6, 2022

// swap HTTP_TRANSPORT = GoogleNetHttpTransport.newTrustedTransport(); // with HTTP_TRANSPORT = new com.google.api.client.http.javanet.NetHttpTransport(); Here is what the above code is Doing: 1. The first line is importing the GoogleNetHttpTransport class from the Google API Client Library for Java. 2. The second line is importing the NetHttpTransport class from the Google API Client Library for Java. 3. The…

check how many times a character appears in a string java

Java Examples

check how many times a character appears in a string java

ByAnurag batra October 11, 2022September 6, 2022

str.chars().filter(num -> num == ‘$’).count() Here is what the above code is Doing: 1. We’re using the chars() method to get a stream of characters from the String. 2. We’re using the filter() method to filter out all the characters that are not ‘$’. 3. We’re using the count() method to count the number of…

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