Mastering Loops in Java: For, While, and Do-While Explained for Android Studio

In Java, loops are used to repeat a block of code as long as a specified condition is true. Loops are essential in Android development for tasks such as updating UI elements, processing data, or repeating actions. Java provides three main types of loops: for, while, and do-while.

1. For Loop in Java

The for loop is ideal when the number of iterations is known beforehand.

for (int i = 0; i < 5; i++) {
    Log.d("LoopExample", "Value of i: " + i);
}

Use Case in Android:

Loop through a list of items and display them in a RecyclerView.

2. While Loop in Java

The while loop is used when the condition needs to be checked before executing the block of code.

int i = 0;
while (i < 5) {
    Log.d("LoopExample", "While loop i: " + i);
    i++;
}

Use Case in Android:

Poll for data while a network call is active or loading.

3. Do-While Loop in Java

The do-while loop will always execute the code block once, even if the condition is false.

int i = 0;
do {
    Log.d("LoopExample", "Do-while i: " + i);
    i++;
} while (i < 5);

Use Case in Android:

Prompt user input at least once before checking validation.

Best Practices:

• Avoid infinite loops: ensure conditions are properly set.
• Prefer for when iteration count is known.
• Use while or do-while when the condition depends on runtime logic.
• Always test your loop logic with log outputs in Android Studio (Log.d()).

Conclusion:

Understanding loops in Java is fundamental for Android developers. Whether you’re displaying lists, repeating animations, or validating inputs — mastering the for, while, and do-while loops gives you more control and flexibility in app development using Android Studio.