This Java code defines a class called `sum_numbers_1` which contains a method to calculate the sum of all integers from 1 to `n` using a recursive approach. Here’s a breakdown of the code components: ...

Beginner Level (1–20): Focus on Syntax, Control Flow, Data Types Print “Hello, World” – Basic structure of Java program. Sum of Two Numbers – Take input and print the sum. Check Even or Odd – If-else ...