Hello, Java journeyers!
In this session, we’re exploring another crucial aspect of Java programming: loops. Loops are fundamental for executing a block of code repeatedly, based on a given condition. They make programming efficient, especially when dealing with repetitive tasks.
We’ll cover three main types of loops in Java: for, while, and do-while loops.
1. for Loop
The for loop is used to iterate a block of code a known number of times. It’s concise and includes initialization, condition, and increment/decrement in a single line.
Example:
for (int i = 0; i < 5; i++) {
System.out.println("i is " + i);
}
2. while Loop
The while loop repeats a block of code as long as a specified condition is true. The condition is evaluated before the execution of the loop’s body.
Example:
int i = 0;
while (i < 5) {
System.out.println("i is " + i);
i++;
}
3. do-while Loop
The do-while loop is similar to the while loop, but the condition is evaluated after the execution of the loop’s body. This means the do-while loop will execute its body at least once.
Example:
int i = 0;
do {
System.out.println("i is " + i);
i++;
} while (i < 5);
Exercise: Implementing Loops in Simple Programs
Now, let’s practice implementing loops with these simple programming tasks:
- Using a for loop, write a program to print the first 10 natural numbers.
- Using a while loop, create a program that calculates the sum of all numbers up to a given number.
- Using a do-while loop, implement a program that prompts the user to enter a number until they enter 0.
Conclusion
Well done! You’ve just learned about the different types of loops in Java. Loops are powerful tools that save time and lines of code, especially when dealing with repetitive tasks.
Remember, practice is key to mastering these concepts. Experiment with these loops in various scenarios to see how they can make your coding more efficient.
Happy coding, and enjoy your Java programming journey!