Java Program to Find Character Frequency in a String

Java Program to Find Character Frequency in a String

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In this video, we will learn how to write a Java program to find the frequency of each character in a string. Character frequency calculation is a common programming problem that helps beginners understand string manipulation, arrays, and loops in Java.

In this video, you will:
- Learn how to traverse a string and count occurrences of each character
- Handle uppercase and lowercase characters effectively
- Count frequency of characters in a String using nested for loops - Brute force method
- Count frequency of characters in a String using sorting - O(nlogn) method
- Count frequency of characters in a String using inbuilt HashMaps from java.util package
- Practice writing clean, structured, and efficient Java code
- Implement logic using arrays, loops, or hash maps for counting frequency
- See examples of how character frequency is used in text analysis and data processing

Why learn this program?
The *Java program to find character frequency in a string* is an essential exercise for understanding *arrays, loops, and mapping characters to counts* . It is widely applicable in *text analysis, data processing, and competitive programming* . By mastering this program, you will improve your problem-solving skills and string handling in Java.

If you are preparing for *Java coding exercises, board exams, or interviews* , this tutorial will guide you step by step to calculate character frequency efficiently.

Perfect for:
- B.Tech / BCA students
- AP Computer Science students learning Java
- Beginners learning *Java programming and string manipulation*
- Students preparing for *assignments, exams, or coding exercises*
- Developers who want to strengthen their understanding of *arrays, loops, and string handling in Java*
- Anyone preparing for *Java interview questions* related to strings and text processing

Programming Language: Java
Level: Beginner-friendly

Related Videos:
- Sieve of Eratosthenes : https://youtu.be/cu75wZz_MPc
- Validate a Password String : https://youtu.be/K0_OMJqyEPw

Timestamps:
00:00 Intro
00:26 Problem Description
03:04 Method 1 explanation: Brute force method t
03:57 Method 1 : Java code
10:12 Method 2 explanation : Using sorting
12:16 Method 2 : Java code
16:42 Dry run of Java code for method 2
23:38 Method 3 : Using HashMaps from java.util package
24:40 Method 3 : Java code using HashMap java.util class
28:54 Testing the Java code for method 1 - brute force method
29:47 Testing the Java code for method 2 - sorting method
31:03 Testing the Java code for method 3 - using HashMap, LinkedHashMap, TreeMap class from java.util package

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