A quick reference guide for coding interviews.

🔹 1. Basics

Data Types

• Primitives → byte, short, int, long, float, double, char, boolean
• Non-primitive → String, Arrays, Objects

Syntax

class Main {
    public static void main(String[] args) {
        System.out.println("Hello World");
    }
}

Input/Output

import java.util.Scanner;
Scanner sc = new Scanner(System.in);
int x = sc.nextInt();
System.out.println(x);

🔹 2. Control Structures

• If-Else, Switch
• Loops → for, while, do-while, enhanced-for

for (int x : arr) {
    System.out.println(x);
}

🔹 3. Methods

int add(int a, int b) {
    return a + b;
}

• Overloading → same name, diff params