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Java Exercises: Reverse a string

Java Basic: Exercise-37 with Solution

Write a Java program to reverse a string.

Test Data:
Input a string: The quick brown fox

Pictorial Presentation: Reverse a string

Java: Reverse a string

Sample Solution:

Java Code:

import java.util.Scanner;
public class Exercise37 {
     public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("Input a string: ");
        char[] letters = scanner.nextLine().toCharArray();
        System.out.print("Reverse string: ");
        for (int i = letters.length - 1; i >= 0; i--) {
            System.out.print(letters[i]);
        }
        System.out.print("\n");
    }
}

Sample Output: 

Input a string: The quick brown fox                      
Reverse string: xof nworb kciuq ehT

Flowchart:

Flowchart: Java exercises: Reverse a string

Java Code Editor:

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Previous: Write a Java program to compute the distance between two points on the surface of earth.
Next: Write a Java program to count the letters, spaces, numbers and other characters of an input string.

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Java: Tips of the Day

Java: How to round a number to n decimal places in Java

Use setRoundingMode, set the RoundingMode explicitly to handle your issue with the half-even round, then use the format pattern for your required output.

DecimalFormat df = new DecimalFormat("#.####");
df.setRoundingMode(RoundingMode.CEILING);
for (Number n : Arrays.asList(12, 123.12345, 0.23, 0.1, 2341234.212431324)) {
    Double d = n.doubleValue();
    System.out.println(df.format(d));
}

Output:

12
123.1235
0.23
0.1
2341234.2125

For example, when you know that your values are accurate up to 6 digits, then to round half-way values up, add that accuracy to the value:

Double d = n.doubleValue() + 1e-6;

To round down, subtract the accuracy.

Ref: https://bit.ly/3a4mvz0