Loop in Java

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A loop is a programming structure that allows a block of code to be executed repeatedly. This is useful for tasks that need to be performed multiple times, such as iterating through a list of items or printing a table of numbers.

There are three main types of loops in Java: for loops, while loops, and do-while loops.

For loops iterate over a fixed range of values. For example, the following for loop will iterate over the numbers from 1 to 10:

for (int i = 1; i <= 10; i++) { System.out.println(i); }

While loops continue to execute as long as a condition is true. For example, the following while loop will iterate as long as the variable `i` is less than 10:

int i = 1; while (i < 10) { System.out.println(i); i++; }

Do-while loops are similar to while loops, but the condition is checked at the end of the loop instead of at the beginning.

int i = 1; do { System.out.println(i); i++; } while (i < 10);

How to Use a Loop in Java

To use a loop in Java, you first need to create a variable to store the value that you want to iterate over. For example, if you want to iterate over the numbers from 1 to 10, you could create a variable called `int i` and assign it the value 1.

Next, you need to create a loop statement. The syntax for a for loop in Java is as follows:

for (initialization; condition; update) { // code to be executed }

The initialization statement is executed once before the loop starts. The condition statement is checked each time the loop iterates, and the update statement is executed after each iteration.

If the condition statement is true, the code in the loop body is executed. After the code in the loop body is executed, the update statement is executed and the loop goes back to the top of the loop. This process continues until the condition statement becomes false.

Example of a Loop in Java

Here is an example of a for loop in Java that prints the numbers from 1 to 10:

for (int i = 1; i <= 10; i++) { System.out.println(i); }

Real-Life Examples of Loops

There are many real-life examples of loops. For example, a loop could be used to:

  • Iterate through a list of items to find a particular item.
  • Print a table of numbers.
  • Calculate the sum of a series of numbers.
  • Sort a list of items.
  • Analyze a large dataset.

Loops are an essential part of programming, and they can be used to solve a wide variety of problems.

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