System.out.println("your text");
Here is what the above code is Doing:
1. The first line is a comment. It’s ignored by the computer.
2. The second line is a class declaration. It tells the computer that this is a class called “HelloWorld”.
3. The third line is a method declaration. It tells the computer that this is a method called “main”.
4. The fourth line is a statement. It tells the computer to print out the text “Hello World!”.
Fragment fragment = new tasks(); FragmentManager fragmentManager = getActivity().getSupportFragmentManager(); FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction(); fragmentTransaction.replace(R.id.content_frame, fragment); fragmentTransaction.addToBackStack(null); fragmentTransaction.commit(); Here is what the above code is Doing: 1. Create a new instance of the fragment you want to switch to. 2. Get the FragmentManager and start a transaction. 3. Replace whatever is in the fragment_container view with…
List names = new ArrayList(List.of(“John Doe”, “Jack Doe”, “John Smith”)); Iterator it = names.iterator(); while (it.hasNext()) { String name = it.next(); if (name.startsWith(“John”)) { it.remove(); } } Here is what the above code is Doing: 1. Create a list of names. 2. Create an iterator for the list. 3. Iterate over the list using the…
Linux: ~/Android/Sdk Mac: ~/Library/Android/sdk Windows: %LOCALAPPDATA%\Android\sdk Here is what the above code is Doing: 1. It’s creating a new instance of the AndroidDebugBridge class. 2. It’s setting the path to the Android SDK. 3. It’s initializing the AndroidDebugBridge. 4. It’s waiting for the AndroidDebugBridge to be initialized. 5. It’s getting the list of connected devices….
public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Typeface font = Typeface.createFromAsset(getAssets(), “fonts/bebas_neue_regular.ttf”); TextView tvNormal = (TextView) findViewById(R.id.normal); tvNormal.setTypeface(font); TextView tvBold = (TextView) findViewById(R.id.bold); tvBold.setTypeface(font, Typeface.BOLD); TextView tvItalic = (TextView) findViewById(R.id.italic); tvItalic.setTypeface(font, Typeface.ITALIC); TextView tvBoth = (TextView) findViewById(R.id.boldItalic); tvBoth.setTypeface(font, Typeface.BOLD_ITALIC); } } Here is what the above code is…
Stream testStream = Stream.of(‘a’, ‘b’, ‘c’); String result = testStream.collect(Collector.of( StringBuilder::new, StringBuilder::append, StringBuilder::append, StringBuilder::toString)); Here is what the above code is Doing: 1. The first argument to the Collector.of() method is a Supplier that creates a new StringBuilder instance. 2. The second argument is a BiConsumer that appends a character to the StringBuilder. 3. The…
import java.io.FileWriter; … FileWriter writer = new FileWriter(“output.txt”); for(String str: arr) { writer.write(str + System.lineSeparator()); } writer.close(); Here is what the above code is Doing: 1. Create a FileWriter object. 2. Loop through the array and write each element to the file. 3. Close the file.