for loop in java | Mastering the Java for Loop: Unleash Your Coding Potential
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Loop is a group or sequence of statements (programming instructions) executed repeatedly until a particular condition is reached.
Loops can execute a block of code as long as a specified condition is reached.
Loops are handy because they save time, reduce errors, and they make code more readable
Why we need loops ?
There are many situations where we need to perform the same work (programming statement) many times, in such cases, we may use a loop to eliminate our workload and also make the execution of the program faster. For example, suppose, we need to print the sentence “Hello World” 50 times on the output screen. Well, we can do it by using the print statement 50 times (without using loops). But, how about if we need to print the same sentence one thousand times? Here, loops come in handy.
The java for loop is used to iterate a part of the program several times. If the number of iteration is fixed, it is recommended to use for loop
The syntax of the for loop :
for(initialization; condition; increment/decrement)
//code block to be executed
The for loop declaration consists of three parts (portions) separated by two semicolons(;).
Initialization: in this portion, we initialize the loop variable, and it executes only once in a complete loop execution.
Condition: it is the test-condition for the loop to run. Remember that the loop runs and the code (body) get executed only if the condition is true.
Increment or decrement(update statement): to increment or decrement the loop variable or other variables. This portion of the loop is executed after the loop’s code(body) execution.
Body or code of the loop: it is the block of statements that get executed when the loop’s condition is true.
How for loop works?
First of all, the initialization of the loop variable is performed. This statement is executed only once.
Then, the test expression (condition) is evaluated. If the condition is true, the code inside the body of for loop is executed.
After that, increment/decrement on the loop variable is performed, and again, the test expression (condition) is evaluated.
This process repeats until the test expression becomes false.
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