JavaBeginner

Reverse a String in Java

WoHoTech Team

What this full course or tutorial helps you learn

Practice Java string reversal using a for loop, charAt, Scanner input, and StringBuilder with a WohoTech code editor layout. Use this page as a focused learning resource for java concepts, interview preparation, and practical revision.

Problem

DescriptionEditorialInterview Notes

EasyJavaString

Reverse a String in Java

Given a string, print the characters in reverse order. Solve it first using a simpleforloop without using a built-in reverse method. Then compare it with theStringBuilderapproach.

Problem

Read one line from the user and display the same string from last character to first character.

Input

WohoTech

Output

hceTohoW

Examples

InputWohoTech

OutputhceTohoW

InputJava

OutputavaJ

Inputmadam

Outputmadam

Approach Using For Loop

Store the input string in a variable.
Start the loop from name.length() - 1.
Keep moving backward until index 0.
Print each character using charAt(i).

Complexity

Time

O(n)

Extra Space

O(1)

Java String Reverse Interview Questions

Can you reverse a string without using StringBuilder.reverse()?
Why does the loop start from length() - 1?
What is the time complexity of reversing a string?
What happens if the input string is empty?
How do you read a string character by character in Java?

Code

Java / Reverse string without built-in reverse method

123456789101112131415161718

Solution hidden

Try the logic first. Click below when you want to reveal the Java code.

SavedLn 17, Col 1

Testcase

Input

WohoTech

Expected

hceTohoW

Input

Java

Expected

avaJ

Input

madam

Expected

madam

Frequently Asked Questions

How do you reverse a string in Java using a for loop?v

Start from string.length() - 1 and move backward to 0, printing each character with charAt(i).

Can Java reverse a string without built-in reverse methods?v

Yes. Use a backward for loop and charAt(i) to read and print every character manually.

How do you read character by character from a Java string?v

Use a for loop from index 0 to string.length() - 1 and access each character with charAt(i).

Continue with related tutorials and placement topics

DBMS JavaScript Python Java + DSA Java Machine Learning

Reverse a String in Java

WoHoTech Team

What this full course or tutorial helps you learn

Problem

DescriptionEditorialInterview Notes

EasyJavaString

Reverse a String in Java

Given a string, print the characters in reverse order. Solve it first using a simpleforloop without using a built-in reverse method. Then compare it with theStringBuilderapproach.

Problem

Read one line from the user and display the same string from last character to first character.

Input

WohoTech

Output

hceTohoW

Examples

InputWohoTech

OutputhceTohoW

InputJava

OutputavaJ

Inputmadam

Outputmadam

Approach Using For Loop

Store the input string in a variable.
Start the loop from name.length() - 1.
Keep moving backward until index 0.
Print each character using charAt(i).

Complexity

Time

O(n)

Extra Space

O(1)

Java String Reverse Interview Questions

Can you reverse a string without using StringBuilder.reverse()?
Why does the loop start from length() - 1?
What is the time complexity of reversing a string?
What happens if the input string is empty?
How do you read a string character by character in Java?

Code

Java / Reverse string without built-in reverse method

123456789101112131415161718

Solution hidden

Try the logic first. Click below when you want to reveal the Java code.

SavedLn 17, Col 1

Testcase

Input

WohoTech

Expected

hceTohoW

Input

Java

Expected

avaJ

Input

madam

Expected

madam

Frequently Asked Questions

How do you reverse a string in Java using a for loop?v

Start from string.length() - 1 and move backward to 0, printing each character with charAt(i).

Can Java reverse a string without built-in reverse methods?v

Yes. Use a backward for loop and charAt(i) to read and print every character manually.

How do you read character by character from a Java string?v

Use a for loop from index 0 to string.length() - 1 and access each character with charAt(i).

Reverse a String in Java

What this full course or tutorial helps you learn

Reverse a String in Java

Problem

Examples

Approach Using For Loop

Complexity

Java String Reverse Interview Questions

Solution hidden

Frequently Asked Questions

More Full Courses and Tutorials

Continue with related tutorials and placement topics

Reverse a String in Java

What this full course or tutorial helps you learn

Reverse a String in Java

Problem

Examples

Approach Using For Loop

Complexity

Java String Reverse Interview Questions

Solution hidden

Frequently Asked Questions

More Full Courses and Tutorials

Continue with related tutorials and placement topics