If you have just started learning basics of Java programming language or familiar
with programming in either C or C++ then these Java programming questions and exercises for
you. It doesn't focus on particular part of Java but these coding exercises
will switch you in programming mode.These are also great way to master basic
programming construct like if-else , loops like for and
while, break and continue with loop, Java operators e.g. arithmetic
and logical operator, recursion, methods or functions and common Java API. You may also
find these Java programming questions in most of Java courses taught in school,
colleges and various Java training courses. Even I have started learning Java
by doing these exercises multiple times with different ways. They are
interesting, gives feeling of accomplishment if you complete it. These Java programs
looks simple but they are still tricky for novice Java programmers. Try to
solve these coding exercises by yourself but if you stuck you can check
relevant links or of-course use google to get more insight on them. You can also
see here more Java programming
questions and exercises.
Java Programing Questions exercises for beginners to practices
Here is my list of 10 Java programming questions or Java programs which can help any beginner to get
started in programming world. These are classics, popular and very effective.
You can use either notepad or any Java IDE like Eclipse or Netbeans for
coding. See links for solution and hints.
1. Write
a program in Java to check if a number is even or odd in Java? (input 2
output true, input 3 : output false)
A number is called even if it is completely divisible by two and odd if
it’s not completely divisible by two. For example number 4 is even number
because when you do 4/2 , remainder is 0 which means 4 is completely divisible
by 2. On the other hand 5 is odd number because 5/2 will result in remainder as
1. See here to find how to check even and odd number in Java.
2. Write
a program in Java to find out if a number is prime in Java? (input 7:
output true , input 9 : output false)
A number is called prime if it is divisible by either itself or 1. There
are many algorithm to find prime numbers e.g. instead of dividing till number,
division upto square root of number may be enough. Start from simplest one and
than try to solve this problem with couple of different ways. Here is one way
to check prime numbers in Java
3. Write Java
program to check if a number is palindrome in Java? ( 121 is
palindrome, 321 is not)
A number is called a palindrome if number is equal to reverse of number
e.g. 121 is palindrome because reverse of 121 is 121 itself. On the other hand
321 is not palindrome because reverse of 321 is 123 which is not equal to 321.
See here for solution of checking if a number is palindrome or not
in Java.
4. How to
find if a number is power of 2 in Java? (1,2, 4 power of 2, 3 is not)
This is another interesting Java programming exercise. This program can
be solved using different ways e.g. using arithmetic operator or by using bit
shift operator.
5. Write
program to sort an integer array without using API methods?
Sorting questions are one of the integral part of programming questions. There are many sorting algorithm out there to sort any array in Java e.g.
Bubble sort, Insertion sort, Selection sort or quick sort. Implementing sorting
algorithm itself a good programming exercise in Java. By the way here is one
way to sort an integer array with Bubble sort
algorithm in Java.
6. Write
Java program to check if a number is Armstrong number or not? (input 153 output true, 123 output false)
An Armstrong number of 3 digit is a number for which sum of cube of its
digits are equal to number e.g. 371 is an Armstrong number because 3*3*3
+ 7*7*7 + 1*1*1 = 371). See here for sample Java program to check if a number is Armstrong number or
not.
7. Write
a program in Java to reverse any String without using StringBuffer?
This is another classical Java programming question. You can reverse
String in various way in Java but two programming technique is used to do e.g.
Iteration and Recursion. Try solving this
problem using Iteration first by using Java’s arithmetic operator and than
look to implement a recursive solution. Here is one way to reverse String in Java without using
StringBuffer.
8. Write
a program in Java to print Fibonacci series up to given number? Write both
iterative and recursive version.
Fibonacci series a popular number series and very popular programming question in Java, in which number is equal to sum
of previous two numbers, starting from third. Fibonacci series is also a good
recursion exercise and often asked in Interviews as well. Try doing this exercise by using both Iteration e.g. loops and recursion. For help see How to print Fibonacci series in Java
using recursion.
9. Write a
Java program to calculate factorial of an integer number ? Both iterative and
recursive solution.
Calculating Factorial is also a classic recursion exercise in
programming. Since factorial is a recursive function, recursion becomes natural
choice to solve this problem. You just need to remember formula for calculating
factorial which is for n! its n*(n-1)*…1. here is one way to calculate Factorial in Java using
recursion.
10. Print
following structure in Java?
This program is a good exercise for mastering loops e.g. for loop and
while loop in Java. This also teaches you How to use break and continue statement
with loops in Java. By the way you can print any character and use System.out.print() and System.out.println())
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These were some programming questions and exercises for beginners learning Java
programming language. This list is simple and you can solve these coding
exercises in any programming language. I am sure Java beginners will find these
exercises interesting and useful. You can also post any coding exercise which
you think can help junior programmers to learn programming and help converting
logic to code.
Other Java programming tutorials for beginners
These are good Java programming exercises for beginners but for experienced programmer its too simple. I would rather give complex application to develop to experienced programmer in couple of hours rather than simple programming exercise.
ReplyDeleteTo the previous commenter, even for experienced programmers some of these problems are still usefull to sharpen your skills with. A solid base will improve your overall ability and infact research into finding an efficint method of finding the factorial of an integer is still being conducted, if I'm not mistaken.
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