how to use character with for loop in java

1String str = "hello";
2for (char c : str.toCharArray())
3  //process c

1package myForLoops
2
3public class forLoop {
4	public static void main(String[] args) {
5    
6		for (int i = j; i<=k; i++)  
7        //variable "i" is the value checked in loop
8        //variable j is the starting value for i
9        //variable k is where we want the loop to end
10        //i++ adds 1 to i each iteration of the loop until i == k
11		{
12        	//displays "i"
13			System.out.println(i);
14		}
15        
16        //this is a for loop in use
17        for (int i = 1; i<=10; i++) {
18        	System.out.println(i); //i will be displayed 10 times being 
19            //increased by 1 every time
20        }
21        
22        for (char ch = 'k'; ch<= 'q'; ch++) {
23        	//this is a for loop with characters, it will
24            //display every character from 'k' to 'q'
25        	System.out.println(ch);
26        }
27        for (int i = 10; i>=1; i++) {
28        	//this loop will be infinitely run since i 
29            //will always be greater than 1, we do not want this
30        	System.out.println(i);
31        }
32        for (int i = 10; i>=1; i--) { 
33        	//this is the correct way of doing the previous code 
34            //(if you do not want an infinite for loop)
35        	System.out.println(i);
36        }
37	}
38}