Repetition Structures in Java: A Complete Guide

Repetition structures, or loops, are fundamental to writing efficient and concise code in Java. They allow you to execute a block of code multiple times, which is useful in a variety of situations, from iterating through collections of data to repetitively executing tasks. In this article, we will explore the main repetition structures in Java: ','while' and 'do-while'.

'for' structure

The 'for' loop is one of the most used repetition structures in Java. It is ideal for scenarios where we know in advance how many times we want to repeat a block of code.

Syntax:

Example:

In this example, the value of 'i' is initialized to 0, and the code block inside the loop is repeated as long as 'i' is less than 10. After each iteration, 'i' is incremented by 1.

'while' structure

The 'while' loop is used when we do not know in advance how many times the code block will be executed. It checks the condition before executing the code block.

Syntax:

Example

In this example, the code block is executed as long as 'counter' is less than 10. The variable 'counter' is incremented in each iteration.

'do-while' structures

The 'do-while' loop is similar to the 'while' loop, but the condition is checked after executing the code block. This ensures that the code block is executed at least once.

Syntax:

Example:

In this example, the code block is executed first, and then the condition is checked. The loop continues until 'number' is less than 10.

Nested Loops

You can nest loops to iterate over multidimensional data structures such as arrays.

Example

In this example, the inner loop ('for' with 'j') is executed completely for each iteration of the outer loop ('for' with 'i').

Flow Control with Loops

Java offers some instructions to control the flow within loops, such as 'break' and 'continue'.
'break'
The 'break' statement ends the loop immediately.

Example

In this example, the loop is interrupted when 'i' is equal to 5.
'continue'
The 'continue' statement skips the current iteration and goes to the next one.

Example

In this example, the code block is executed only for odd values ​​of 'i'.

Conclusion

Understanding and correctly using repetition structures is essential for writing efficient and readable Java code. Each type of tie has its ideal characteristics and applications. Practice using 'for', 'while' and 'do-while' to master these tools and apply them effectively in your projects.

I hope this guide was helpful. Until the next article, keep coding!

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