What is Loops In Java?: Loops in Java is a feature used to execute a particular part of the program repeatedly if a given condition evaluates to be true.
For Loop:
A counted loop
Great choice if you know exactly how many loops to perform, or if that number can be supplied by the user
Do-While Loop:
The loop always runs at least once
Great choice when asking a question, the answer to which will determine if you loop again
While Loop:
A good multi-use loop for dealing with:
o User input
o Numbers
o Strings
Let's Understand In Brief...
1. Do-While Loops
Do-While loops work almost exactly like While loops. Code inside a do-while loop will run once first, then check to see if the condition is met.
Example 1:
Compare the results of this program using a While Loop vs a Do-While Loop:
While Loop
x = 1;
while(x > 5)
{
System.out.println("Looping");
x = x + 1;
}
System.out.println("Done");Do While Loop
x = 1;
do
{
System.out.println("Looping");
x = x + 1;
} while ( x > 5 );
System.out.println("Done");For Loops
For Loops allow you to easily write code that loops a specific number of times.
Example 2:
Compare the while and For Loops using below example
While Loop
x = 1;
System.out.println("Start");
while (x < 4)
{
System.out.println(x);
x = x + 1;
}
System.out.println("End");For Loop
System.out.println("Start");
for (x = 1; x < 4; x = x + 1)
{
System.out.println(x);
}
System.out.println("End");Important Facts: Need to know when Learn about Loops
Infinite Loops #1
One easy mistake to make when working with loops is accidently creating an infinite loop. An infinite, or endless, loop is a loop that never exits and loops forever, or at least until the power goes out. There are two main types of infinite loops:
Always have an exit condition defined, either within the loop itself or with a break statement..
Break Statements #2
You can use a break to exit a loop early.
Example:
x = 1;
while (x < 5)
{
if (x == 3)
{
break;
}
System.out.println("Looping");
x = x + 1;
}
System.out.println("Done");Java Assignment Help Services In Which You Can Get Help:
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