Multiple initialization and update Expression:

A for loop may contain multiple initialization and/or multiple update expression.

for(i=1,sum=0;i<=n;sum+=i,++i)
   System.out.println(i);

Optional Expression:

All the three expressions of the for loop are optional.

for(;test-expression;update-expression(s))
OR
for(initailization;test-expression;)
OR
for(;test-expression;)

Infinite Loop:

An infinite loop is an endless loop which can be created by omitting the test-expression.

for(j=25; ;--i)
   System.out println("coderzpy!");

Empty Loop:

This is also known as a time delay loop, which is often used in programs

for(j=20;k>=0;--i)

Nested Loop:

A loop may contain another loop inside its body. This form of a loop is known as nested loop

Note: The inner loop must terminate before the outer loop.

class Demo {
    public static void main(String[] args) {int i,j;
       for(i=1;i<=5;i++){
   for(j=1;j<=i;j++){
       System.out.print("*");
       }
  System.out.println(" ");
         
}  
    }
}

Output:

* 
** 
*** 
**** 
***** 

Comparison of Loops:

Though Java loops can be used in almost all situations, yet there are some situations where one loop fits better than the other.

• The for loop is appropriate when you know in advance how many times the loop will be executed.
• The while and do-while loops are more suitable in the situations where it is not known beforehand when the loop will terminate.
• The while should be preferred when you may not want to execute the loop body even once.
• do-while is preferred when you’re sure you want to execute the loop body at least once.

Note: also read about the Iteration Statements(Loops)

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