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Java programs

A main method, then the problems they solve.

4 topics · 90 examples · ordered like a syllabus

Open Hello World

Topics, in order

Finish one. The next is the card below.

  1. 01Module 1: Basic Java Programsprint, Scanner, if, a bit of math. Week-one Java. Skip ahead if this is slow.
    • Hello World
    • Add Two Numbers
    • Swap Two Numbers
    20 programs →
  2. 02Module 2: Conditional Programsif / else / switch. Grades, leap years, bills. The equal-to case is where it lies.
    • Grade Calculator
    • Vowel or Consonant
    • Check Alphabet/Digit/Special Character
    20 programs →
  3. 03Module 3: Loop Programsfor and while. Digits, primes, patterns. You will get tired of i++ and that is the point.
    • Print 1–100
    • Print Even Numbers
    • Print Odd Numbers
    25 programs →
  4. 04Module 4: String Programsreverse, palindrome, split, regex. Strings are where beginners leak hours. equals(), not ==.
    • Reverse String
    • Check Palindrome String
    • Count Vowels
    25 programs →