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Thread: How to Use different Java loops

  1. #1
    mmm.. coffee JavaPF's Avatar
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    Post How to Use different Java loops

    Here is a quick example showing you how to use different loop types in Java.

    For loop

    public class JavaLoops {
     
        /**
         * JavaProgrammingForums.com 
         */    
        public static void main(String[] args) {
     
            // For loop example
            for(int a = 0; a < 10; a++){
                System.out.println("This is a for loop");
            }        
        }
    }
    Example output:

     

    This is a for loop
    This is a for loop
    This is a for loop
    This is a for loop
    This is a for loop
    This is a for loop
    This is a for loop
    This is a for loop
    This is a for loop
    This is a for loop


    For Each loop

    public class JavaLoops {
     
        /**
         * JavaProgrammingForums.com
         */
        public static void main(String[] args) {
     
            String[] myString = {"Java", "Programming", "Forums", ".com"};
     
            // For each loop
            for(String s : myString){
                System.out.print(s);
            }
        }
    }
    Example output:

     

    JavaProgrammingForums.com


    Do While loop

    public class JavaLoops {
     
        /**
         * JavaProgrammingForums.com
         */
        public static void main(String[] args) {
     
            // Do While loop
            int count = 1;
     
            do {
                System.out.println("Count is: " + count);
                count++;
            } while (count <= 10);
        }
    }
    Example output:

     

    Count is: 1
    Count is: 2
    Count is: 3
    Count is: 4
    Count is: 5
    Count is: 6
    Count is: 7
    Count is: 8
    Count is: 9
    Count is: 10


    While loop

    public class JavaLoops {
     
        /**
         * JavaProgrammingForums.com
         */
        public static void main(String[] args) {
     
            // While loop
            while(true){
                System.out.println("I'm looping forever");
            }        
        }
    }
    Example output. Note that this loop will keep going forever.

     

    I'm looping forever
    I'm looping forever
    I'm looping forever
    I'm looping forever
    I'm looping forever
    I'm looping forever
    I'm looping forever
    I'm looping forever
    I'm looping forever
    I'm looping forever
    ....


    Please use [highlight=Java] code [/highlight] tags when posting your code.
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  2. #2
    Super Moderator Json's Avatar
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    Default Re: How to Use different Java loops

    For Each loop on a Map

    public class JavaLoops {
     
        /**
         * JavaProgrammingForums.com
         */
        public static void main(String[] args) {
            final Map<String, String> stringMap = new HashMap<String, String>();
            stringMap.put("key1", "value1");
            stringMap.put("key2", "value2");
            stringMap.put("key3", "value3");
     
            for(final Map.Entry<String, String> entry : stringMap.entrySet()) {
                System.out.println(entry.getKey() + " = " + entry.getValue());
            }
        }
    }


    Example output

     

    key1 = value1
    key2 = value2
    key3 = value3




    // Json

  3. The Following User Says Thank You to Json For This Useful Post:

    Freaky Chris (August 28th, 2009)

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