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Add Two Numbers

5 minutes
Count Words

5 minutes
Reverse a string

5 minutes
Sum of Array Elements

5 minutes
Convert a String to Array

5 minutes
Sort an Array

5 minutes
Find Array Average

5 minutes
Find Smallest Element

5 minutes
ArrayList Loop

5 minutes
Loop Through a HashMap

5 minutes
Loop Through an Enum

5 minutes
Area of rectangle

3 minutes
Even Or Odd Numbers

3 minutes
Positive or Negative

5 minutes
Square Root

5 minutes
Random Number

5 minutes

Java Reference

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Java String Methods

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Java Math Methods

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Java Output Methods

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Java Arrays Methods

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Java ArrayList Methods

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Java LinkedList Methods

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Java HashMap Methods

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Java Errors and Exception

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Text lesson

Reverse a string

Reverse a String

Reversing a string by characters can be done easily with the following example:

Example

String originalStr = "Hello";
String reversedStr = "";

for (int i = 0; i < originalStr.length(); i++) {
  reversedStr = originalStr.charAt(i) + reversedStr;
}

System.out.println("Reversed string: "+ reversedStr);