JAVA CODING QUESTIONS FOR SPRING BOOT DEVELOPER

Q #1) Write a Java Program to reverse a string without using String inbuilt
function.

TWO POINTER ==> START AND END THERE ==> USES WHILE NOT FOR

Q #2) Write a Java Program to swap two numbers without using the third
variable.
ADD-SUB-SUB
CHANGE IN MIDDLE FINGER (B COMES)

Answer:

`public void swapNumbers(int a, int b) { 
a = a + b;  // A=A^B
b = a - b;  // B=A^B
a = a - b;  // A=A^B
System.out.println("After swap: a = " + a + ", b = " + b); 
}`

Q 3) Write a Java Program to count the number of words in a string using
HashMap

Q #4)** Write a Java Program to iterate HashMap using While and advance for
loop.**

Q #5) Write a Java Program to find whether a number is prime or not in the most efficient way?

Q #6) Write a Java Program to find whether a string or number is
palindrome or not.

Q #7) Write a Java Program for the Fibonacci series in recursion.