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Java Interview Programs

  1. How to Create Immutable Class In Java ?
  2. Write a Java Program to Find Longest Substring Without Repeating Characters In Java ?
  3. Write a Java Program to Find First Repeated And Non-Repeated Character from given String ?
  4. Write a Java Program to Check weather two Strings are Anagram or Not ?
  5. Write a Java Program to remove duplicate characters from String Without Using any API ?
  6. Write a Java Program to remove duplicate characters from String using any API ?
  7. Write a Java Program to Count UpperCase Character in Given String ?
  8. Explain Exception hierarchy in Java ?
  9. What are rules of Method Overriding in Java ?
  10. Write a Java Program To Reverse The String With Preserving The Position Of Spaces ?
  11. What is String Pool Constant In Java ?
  12. Write a Java program to check whether one string is rotation of another String ?
  13. Write a java program to remove all white spaces from a String ?
  14. Write a java program to find the duplicate words and their number of occurrences in a String ?
  15. Write a Java Program to Reverse Each Word of Given String ?
  16. What are different ways to create String Object ?
  17. Write a Java Program to Convert Numeric String into Int ?
  18. Write a Java Program to Count and Print Vowels and Consonants from String ?
  19. What are different ways to Create Objects In Java ?
  20. Write a Java Program to Reverse String ?
  21. Java Program to check Number is Prime or Not ?
  22. Java Program to Sum each Digit of Given Number ?
  23. Java Program to Swap Two Variables Without Using Third Variable?
  24. Java Program to find Common Elements from two Arrays ?
  25. Java Program to find First And Second Maximum Number From int type Array ?
  26. Java Program to check Number is Perfect or Not ?
  27. Java Program to find Duplicate Character In String ?
  28. Java Program to Reverse Numbers ?
  29. Java Program to Print Prime Numbers From 1 to N ?
  30. Write a Java Program for Calculator ?
  31. Java Program to find First Non Repeated Character In A String ?
  32. Java Program to find Minimum & Maximum Element From ArrayList Or Collection ?
  33. Java Which run first Static Block, Block, Constructor or Method() ?
  34. What is memory leak in Java ?
  35. Different ways to call Garbage Collection In Java ?
  36. If Super class implements Serializable interface, Then sub classes can be Serializable or not ?
  37. If Sub class implements Serializable interface,Then Parent class can be serialized or not?
  38. Java Program for finding duplicate element from ArrayList ?
  39. Java Program Without Main Method ?
  40. Java Program For Fibbonacci Series ?
  41. Java Program to read all Files from Directory or Sub Directory For Some Period of time ?
  42. Java Program to Calculate Factorial of given Number ?
  43. Java program to Check Year Is Leap Year or Not ?
  44. Java Program to Count Numbers of Characters From String ?
  45. Java program take array as input and count element occurrence and then find element with maximum occurrence?
  46. Java program to print Diamond ?
  47. Write a Program for Bubble Sort In Java ?
  48. Java Program to Remove Duplicate Elements From Int Array ?
  49. Java Program to Convert Celsius to Fahrenheit ? 
  50. Java Program to Convert Fahrenheit to Celsius ? 

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