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

Compare the output of the following two loops:

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");