Java

Loop Control n Java

Loop Control n Java

Loop control is an essential part of Java programming, allowing developers to create programs that execute a set of instructions repeatedly until a certain condition is met. Loops come in two main forms: for and while loops, both providing programmers with powerful essence when dealing with long series of code or performing operations on large datasets. The former works by initializing a counter variable which gets incremented at each iteration, while the latter checks if its condition has been met before executing any block of statements - making them ideal for situations where one doesn't know exactly how many times their loop needs to be executed. 

For loop:
Syntax

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

The initialization, condition, and increment/decrement expressions are optional, but at least one of them must be present. The initialization expression is executed once at the beginning of the loop, the condition expression is checked before each iteration, and the increment/decrement expression is executed after each iteration. 
Example: 

for(int i = 0; i < 5; i++) 
{
System.out.println(i); 
} 

This will print numbers from 0 to 4. 

While loop: 
Syntax: 

while(condition) { 
// code to be executed 
} 

The condition is checked before each iteration of the loop, and the code block will be executed if it is true. The loop will be exit if the condition is not true. 

int x = 5; 
while(x > 0) { 
System.out.println(x); 
x--; 
} 

This while loop will print the numbers 5 through 1 to the console. 

Do-While Loops 
Do-while loops are similar to while loops, but the code block is guaranteed to be executed at least once. The basic syntax of a do-while loop is: 
Syntax: 

do { 
// code to be executed 
} while(condition); 

The difference is that the code block is executed first, and then the condition is checked. The code block will be executed again if the condition specified in a while is true. If the condition is false, the logic will not be executed, and the loop will exit. 

int y = 5; 
do { 
System.out.println(y); 
y--; 
} while(y > 0); 

This do-while loop will print the numbers 5 through 1 to the console, just like the previous while loop example. 
 

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