#Java - Code Snippets for '#For loop'

#Java - Code Snippets for '#For loop' - 5 code snippet(s) found

Sample 1. Write a Program to reverse a string iteratively and recursively

Using String method -



new StringBuffer(str).reverse().toString();



Iterative -



Strategy - Loop through each character of a String from last to first and append the character to StringBuilder / StringBuffer



public static String getReverseString(String str){

   StringBuffer strBuffer = new StringBuffer(str.length);

   for(int counter=str.length -1 ; counter>=0;counter--){

      strBuffer.append(str.charAt(counter));

   } 

   return strBuffer;

}



Recursive -



Strategy - Call the method with substring starting from 2nd character recursively till we have just 1 character. 



public static String getReverseString(String str){

   if(str.length <= 1){

      return str;

   }

   return (getReverseString(str.subString(1)) +      str.charAt(0);

}

_{Like Feedback string StringBuffer recursion for loop control statements loop statement stringbuffer.append java.lang.String java.lang.StringBuffer String Manipulation}

Sample 2. Write a method to input 10 numbers and then print the sum.

public void calculateSum() {

   Scanner scanner=new Scanner(System.in); 

   int sum=0;

   for(int counter=1;counter<=10;counter++) 

      sum=sum+(scanner.nextInt());



   System.out.println("The sum is: "+sum);

}

_{Like Feedback scanner for loop scanner.nextInt input numbers and print sum}

Sample 3. Retry in case of exception

public static final int NUMBER_OF_RETRIES = 5;



try {

   // do something

} catch (Exception e) {

   int count;

   for (count = 1; count <= NUMBER_OF_RETRIES; count++) {

      Thread.sleep(5000);

   } catch (InterruptedException e1) {

      try {

         // do something again

         break;

      } catch (Exception ex) {

   }

}

_{Like Feedback exception handling exception Retry in case of exception for loop for Thread.sleep InterruptedException}

Sample 4. Display elements of a List using For loop

List myList = new ArrayList();

      

myList.add("A");

myList.add("B");

myList.add("C");



for(String str:myList){  // prints A B C

   System.out.println(str);

}

_{Like Feedback Print elements of a list for loop arraylist list collections}

Sample 5. Display elements of a List using For Loop and index

List myList = new ArrayList();

      

myList.add("A");

myList.add("B");

myList.add("C");



for(int index=0;index < myList.size(); index++){

   System.out.println(myList.get(index));

}

_{Like Feedback Print elements of a list arraylist list collections for loop}

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