Knowledge in Java
Funny code comments
// sometimes I believe compiler ignores all my comments Exception up = new Exception(“Something is really wrong.”); throw up; //ha ha //When I wrote this, only God and I understood what I was doing //Now, God only knows // I dedicate all this code, all my work, to my wife, Darlene, who will // have to support me and our three children and the dog once it gets // released into the public. // drunk, fix later // Magic. Do not touch. return 1; # returns 1 double penetration; // ouch /////////////////////////////////////// this is a well commented line // I am not sure if we need this, but too scared to delete. // I am not responsible of this code. // They made me write it, against my will. //Dear future me. Please forgive me. //I can’t even begin to express how sorry I am. options.BatchSize = 300; //Madness? THIS IS SPARTA! // I have to find a better job // hack for ie browser (assuming that ie is a browser) } catch (PartInitException pie) { // Mmm… pie } // John! If you’ll svn remove this once more, // I’ll shut you, for God’s sake! // That piece of code is not “something strange”! // That is THE AUTH VALIDATION. try { } catch (SQLException ex) { // Basically, without saying too much, you’re screwed. Royally and totally. } catch(Exception ex) { //If you thought you were screwed before, boy have I news for you!!! } // Catching exceptions is for communists // If you’re reading this, that means you have been put in charge of my previous project. // I am so, so sorry for you. God speed. // if i ever see this again i’m going to start bringing guns to work // The magnitude of this hack compares favorably with that of the national debt. //ALL YOUR BASE ARE BELONG TO US // If this code works, it was written by Paul. If not, I don’t know who wrote it //You are not expected to understand this /** * If you don’t understand this code, you should be flipping burgers instead. */ ‘NO COMMENT //Abandon all hope yea who enter beyond this point //Mr. Compiler, please do not read this. catch (Ex as Exception) { // oh crap, we should do something. } // TODO make this work // If you delete the credits, I will fucking kill you. // This is crap code but it’s 3 a.m. and I need to get this working. // For the sins I am about to commit, may James Gosling forgive me // Houston, we have a problem // If I from the future read this I’ll back in time and kill myself.
Rahul Sinha
Java programs to print integers from 1 to 10
class Integers { public static void main(String[] arguments) { int c; //declaring a variable /* Using for loop to repeat instruction execution */ for (c = 1; c <= 10; c++) { System.out.println(c); } } }
Java If Else Condition
class Condition { public static void main(String[] args) { boolean learning = true; if (learning) { System.out.println("Java programmer"); } else { System.out.println("What are you doing here?"); } } }
Java print command line arguments
class Arguments { public static void main(String[] args) { for (String t: args) { System.out.println(t); } } }
Java program to compare strings
import java.util.Scanner; class CompareStrings { public static void main(String args[]) { String s1, s2; Scanner in = new Scanner(System.in); System.out.println("Enter the first string"); s1 = in.nextLine(); System.out.println("Enter the second string"); s2 = in.nextLine(); if (s1.compareTo(s2) > 0) System.out.println("The first string is greater than the second."); else if (s1.compareTo(s2) < 0) System.out.println("The first string is smaller than the second."); else System.out.println("Both the strings are equal."); } }
Java program to print alphabets
class Alphabets { public static void main(String args[]) { char ch; for (ch = 'a'; ch <= 'z'; ch++) System.out.println(ch); } }
Java program to print multiplication table
import java.util.Scanner; class MultiplicationTable { public static void main(String args[]) { int n, c; System.out.println("Enter an integer to print it's multiplication table"); Scanner in = new Scanner(System.in); n = in.nextInt(); System.out.println("Multiplication table of " + n); for (c = 1; c <= 10; c++) System.out.println(n + "*" + c + " = " + (n*c)); } }
Java program to check if number is even or odd
import java.util.Scanner; class OddOrEven { public static void main(String args[]) { int x; System.out.println("Enter an integer to check if it is odd or even"); Scanner in = new Scanner(System.in); x = in.nextInt(); if (x % 2 == 0) System.out.println("The number is even."); else System.out.println("The number is odd."); } }
Java program to convert Celsius to Fahrenheit
import java.util.*; class FahrenheitToCelsius { public static void main(String[] args) { float temperature; Scanner in = new Scanner(System.in); System.out.println("Enter temperature in Fahrenheit"); temperature = in.nextInt(); temperature = ((temperature - 32)*5)/9; System.out.println("temperature in Celsius = " + temperature); } }
Java program to print the largest of the 3 numbers
import java.util.Scanner; class Largest { public static void main(String args[]) { int x, y, z; System.out.println("Enter three integers"); Scanner in = new Scanner(System.in); x = in.nextInt(); y = in.nextInt(); z = in.nextInt(); if (x > y && x > z) System.out.println("First number is largest."); else if (y > x && y > z) System.out.println("Second number is largest."); else if (z > x && z > y) System.out.println("Third number is largest."); else System.out.println("The numbers are not distinct."); } }
Java program for enhanced for loop
class EnhancedForLoop { public static void main(String[] args) { int primes[] = { 2, 3, 5, 7, 11, 13, 17, 19, 23, 29}; for (int t: primes) { System.out.println(t); } } }
IT Committee IIM Ranchi
Java program to reverse string
import java.util.*; class ReverseString { public static void main(String args[]) { String original, reverse = ""; Scanner in = new Scanner(System.in); System.out.println("Enter a string to reverse"); original = in.nextLine(); int length = original.length(); for (int i = length - 1 ; i >= 0 ; i--) reverse = reverse + original.charAt(i); System.out.println("Reverse of the string: " + reverse); }