Java Programs for Beginners

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This page includes a list of Java programs for beginners who want to learn Java programming language by practice. Each blog post in this list dives into a specific Java program, complete with detailed explanations and sample output to bolster your understanding. 

To understand a programming language, you must practice the programs; this way, you can learn the language faster. This page includes Java programs on various Java topics such as control statements, Strings, OOPs, loops, classes & objects, methods, arrays, etc. All the programs are tested and provided with the output. Whether you're new to Java or looking to deepen your expertise, this resource greatly boosts your interview preparation. Start your journey towards becoming a Java interview pro with us!

Note that these programs are frequently asked in Java interviews. All these Java programs have step-by-step explanations along with their output.

Java String Programs with Output

1. Java Program to Find the First Non-repeated Character in a String
2. Java Program to Check Palindrome String
3. Java Program to Find Duplicate Characters in a String
4. Java Program to Find Duplicate Words in a String
5. Java Program to Find All the Permutations of a String
6. Java Program to Count Occurrences of Words in a String
7. Java Program to Count the Occurrences of Each Character
8. Java Program to Count Vowels and Consonants in a String
9. Java program to Count the Number of Duplicate Words in a String
10. Java Program to Count Number of Words in Given String
11. Java Program to Count the Number of Occurrences of Substring in a String
12. Java Program to Count the Occurrences of Each Character in String
13. Java Program to Merge Two String Arrays
14. Java Program to Remove Duplicate Words from String
15. Java Program to Reverse a String(5 ways)
16. Java Program to Reverse Each Word of a String
17. Java Program to Swap Two Strings
18. How to Check if the String Contains Only Digits
19. How to Check if the String Contains Only Letters
20. How to Check If the String Contains Only Letters or Digits
21. Java Program to Remove All Whitespaces from a String
22. Java Program to Check if a String is Empty or Null
23. Java Program to Find Maximum Occurring Character in String
24. Java Program to Add Characters to a String
25. Java Program to Remove All Whitespaces from a String
26. Java Program to Check if a String is Empty or Null
27. Java Program to Find Maximum Occurring Character in String
28. Java Program to Check if a Year is a Leap Year
29. Java Program to Display Characters from A to Z using Loop
30. Java Program To Count the Occurrences of Each Character Using HashMap

Java Array Programs with Output

1. Java Program to Reverse an Array Without Using Another Array
2. Java Program to Find Duplicate Elements in an Array
3. Java Program to Find Largest Number in an Array
4. Java Program to Check the Equality of Two Arrays
5. Java Program to Calculate Average Using Arrays
6. Java Program to Sort the Array Elements in Descending Order

Java Number Programs with Output

1. Java Program to Find Factorial Using Recursion
2. Java Program to Find Sum of Natural Numbers
3. Java Program to Reverse a Number
4. Java Program to Find Prime Numbers
5. Java Program to Check Armstrong Number
6. Java Program to Count the Number of Digits in a Number
7. Java Program for Prime Numbers Within a Range
8. Java Program to Find the Largest of Three Numbers
9. Java Program to Check if a Number is Prime
10. Java Program to Find the Fibonacci Series
11. Java Program to Check if a Number is Positive or Negative
12. Java Program to Find GCD of Two Numbers
13. Java Program to Find Strong Number
14. Java Program to Find LCM of Two Numbers
15. Java Program to Check Palindrome Number
16. Java Program to Swap Two Numbers Without Using a Temp Variable
17. Java Program to Find the Second Largest Number in an Array
18. Java Program to Find GCD of Two Numbers
19. Java Program to Find Strong Number
20. Java Program to Find LCM of Two Numbers
21. Java Program to Check Palindrome Number
22. Java Program to Find the Largest of Three Numbers
23. Java Program to Check if a Number is Prime
24. Java Program to Swap Two Numbers Without Using a Temp Variable
25. Java Program to Find the Second Largest Number in an Array
26. Java Program to Check if a Given Number is Perfect Square
27. Java Program to Find the Fibonacci Series
28. Java Program to Check if a Number is Positive or Negative

Java 8 Programs with Output

1. Java 8 Program to Find the Frequency of Each Character in a Given String
2. Java 8 Program to Find the Maximum Number and Minimum Number in a List
3. Java 8 Program to Find the Second Largest Number in the List of Integers
4. Java 8 Program to Find the Age of a Person if the Birthday Date has Given
5. Java 8 Program to Find the Sum of All Digits of a Number
6. Java 8 Program to Print Even Numbers from a List
7. Java 8 Program to Remove Duplicate Elements from a List
8. Java 8 Program to Retrieve Last Element of a List of Strings
9. Java 8 Program to Reverse Each Word of String
10. Java 8 Program to Sort List of Strings Alphabetically
11. Java 8 Programs for Interview | Java 8 Interview Coding Questions and Answers
12. Java 8 Program To Count Characters in a String
13. Java 8 Program To Find First Repeated Character in a String
14. Java 8 Program to Concatenate Two Streams
15. Java 8 Program To Reverse a String
16. Java 8 Program To Find Prime Number
17. Java 8 Program To Find the Minimum and Maximum Number of a Stream

Java Pattern Programs with Output

1. Java Character Pattern Programs
2. Java Number Pattern Programs
3. 15 Java Star Pattern Programs
4. Java Program for Diamond Shape Pattern
5. Java Program to Print Character Pyramid Pattern
6. Java Program to Print a Pyramid
7. Java Program to Print an Inverted Pyramid
8. Java Program to Print a Hollow Pyramid
9. Java Program to Print a Diamond Pattern
10. Java Program to Print a Right Triangle Star Pattern
11. Java Program to Print an Inverted Right Triangle Star Pattern
12. Java Program to Print a Left Triangle Star Pattern
13. Java Program to Print a Pascal's Triangle
14. Java Program to Print a Fibonacci Pyramid
15. Java Program to Print a Number Pyramid
16. Java Program to Print a Reverse Number Pyramid
17. Java Program to Print a Hollow Square Pattern
18. Java Program to Print a Cross (X) Pattern
19. Java Program to Print a Plus (+) Pattern
20. Java Program to Print a Butterfly Pattern
21. Java Program to Print a Diamond Shape with Numbers
22. Java Program to Print an Alphabet Pyramid
23. Java Program to Print a Heart Shape Star Pattern

Java Programs on OOPS Concepts

1. Java Program to Calculate Salary of an Employee
2. Java Program to Calculate Gross Salary of Employee

Java Programs on Data Structures and Algorithms

1. Java Program to Reverse a Linked List
2. Detecting a Cycle in a Linked List Using Java
3. Finding the Middle Element of a Linked List using Java
4. Merging Two Sorted Linked Lists using Java
5. Queue Implementation in Java Using Array
6. Queue Implementation in Java Using ArrayList
7. Queue Implementation in Java Using LinkedList
8. Queue Implementation in Java Using Two Stacks
9. Priority Queue Implementation in Java Using Linked List
10. Linked List Implementation in Java Using Arrays
11. Doubly Linked List Implementation in Java
12. Circular Linked List Implementation in Java
13. Deque Implementation in Java
14. Finding the Height of a Binary Tree in Java
15. Determining if a Binary Tree is Balanced in Java
16. Implementing Binary Search Tree (BST) Operations in Java
17. Finding the Lowest Common Ancestor in a BST using Java

Java Programs on Matrix

• Java Program to Perform Matrix Multiplication
• Java Program to Find Transpose of a Matrix
• Java Program to Add Two Matrices