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hey what's up everybody today we're going to be doing a words per minute typing counter program that is going to look like this in the end it's going to say 3 2 1 and then you type as fast as you can and then you hit enter it says your words per minute this video is brought to you by squarespace squarespace is the all-in-one shop to build a beautiful online presence and run your business launch your passion project with squarespace so let's get started by making a new java project we'll call it our wpm counter and then inside of there we'll make our class we'll call it wpm program hit the main method and finish the first thing we're going to want to do is print out that three two one to let the user know when to start typing so we'll just start out by printing out three and then copy that two one but when we print this out now it'll just do three to one there's no one second interval between the print statements so that's what we'll do next by typing time unit dot seconds dots sleep and we want to do one second so put it one second in there hover over it and click add throws declaration i'll zoom out a little bit here this tells java that hey this sleep method from time unit seconds may cause an error if there's something wrong with the sleeping so we just let this main method know that some code inside of here may throw this specific exception add this after each one save and run we get a beautiful countdown three two one next what we want to do is print out several random strings that the user is going to have to type exactly so to do this let's create a string array and then use a random number generator to get random elements from that string array we'll call this string array words and set that equal to some words we throw in here some of the random words i could come up with were like envelope cantaloupe the hello you can change these to whatever you want i'm just going to add a few more here so now we have a words array with 10 elements inside let's create a random number generator to start getting random elements and let's import that into our program so now that generated another import statement at the top along with that time unit for the sleeping to get a random element from this words array what we do is words of whatever element we generated to do that you do rand.next ants and then throw the cap the max number for that generation since indexes start at zero and there's ten elements our max one should be nine now this piece of code will generate a random number between zero and nine but we actually have to do something with it so let's actually just throw that inside of a print statement save and something's off here to access this we have to put static in front of it static just means that we don't have to create an object to access this array at the top now if we save and run after the countdown we'll print a random element from this array however we want to generate a bunch of random words not just one so we can repeat this code with a for loop so for example for n equals i and we want to go up until say we'll print out say five words now we'll do ten we'll print out ten words then i plus plus now since this is inside the for loop it'll repeat this code ten times however since this is in a print line method it'll go the next line every time but we want to keep it on the same line so there's actually a method called print that'll just print each on the same line and so they're not all stuck together we'll add a space between each one now we get the results looking beautiful like this next we want to go to the next line so we'll just add a print statement for the user to start typing it if you notice now we can't type anything to do this let's create a scanner object and we'll put system.in here that means the console import the scanner which generates this at the top and we'll say that those typed words is equal to the scanner from the dot next line this gets the next entire line until the user hits enter in this console and stores that as a string into the typed words variable for testing purposes let's just print out that typed words and then we'll just enter something after the countdown like elephant and we get elephant printed out so now that everything's working we actually have to start to calculate the words per minute and we can do that by taking the exact seconds of the day when the words are printed and then taking the seconds of the day when we hit enter subtracting them and then calculating the words per minute with that difference of time so we can actually take the nano seconds of the day so after all those 10 words are printed we'll log the seconds of the day let's type local time dot now to nano of the day this gets the exact nanoseconds of the day that we're currently at we'll store that into a double variable called start next after the user hits enter it'll go to this code down here so we'll just log the end localtime.now.2 nano of the day this gets the current nanoseconds of the day after the user hits enter and we can simply calculate the elapsed time by doing end minus start and to show that this is working we'll just print out that elapsed time variable same run okay so let's wait a few seconds then hit enter let me see it was about five seconds 5.259 seconds that we waited now this says e9 because it's actually nanoseconds so it's a really long number so let's just convert that to regular seconds so to make this more accurate we want to keep that .259 or at least some decimal places so instead of doing an integer seconds we'll create a double seconds that's equal to the elapsed time divided by one one two three two three one two three point zero and then if we print out seconds this is nine zeros by the way line zero is point zero what this will do now is convert it to actual seconds finally we'll calculate the words per minute with some google searching i found that the words per minute formula is this you have x number of characters divided by five and then that divided by one minute will give you y words per minute so we need to first get the number of characters that the user entered and to do that is really easy say the number of chars is equal to that typed word string dot length so now we have the number of characters x and since we have the time we actually have everything we need to start filling in this formula so we'll just say that the integer words per minute is equal to the number of chars divided by five this five is like the average length of a word so we keep that there for a constant then that divided by the number of seconds that we typed all those words since this results in a double and this is an integer we have to cast this whole thing to a double but we can actually do the casting right here double to make sure that this calculation results in a double instead of an integer since num chars is an integer and 5 is an integer this division would be truncated so it wouldn't be accurate so we have to cast this to a double so it's more accurate finally we have to cast this whole thing to an integer to match the words per minute on the left however since this is for our specific elapsed time seconds instead of a minute we have to multiply this whole thing by 60 seconds per minute so we say times 60. so now finally we can print out a little message your words per minute is and then we'll put wpm with a little exclamation mark let's save and run this we get three two one i'm going to type this as fast as i can and i got 64 words per minute these are pretty tricky words to be fair and this also doesn't account for errors so theoretically you could just mash your keyboard and get a really high words per minute but this is just our little program okay so now i'll walk through exactly everything that's happening line for line so when we click the green run button we run code inside of the main method the first line of code in the main method is to print out three so that's why we see three here then we use this code to sleep for one second this works because we imported that time unit code into our program so we print three wait one second print two wait one second print one wait one second and now we do some setup here we create a random number generator from the random class which we imported up here next we have a for loop that goes to 10 we print out this words square brackets rand.nextint9 this rand.next9 is a method from that random class we imported that generates a random number between 0 and 9. let's say for example it generates well actually we know what it generates hammer hammer up here is index seven so we generate the number seven which gets the elements at index seven of this words array up here we put it up here so that all the methods could use it and it's good practice to have things that don't change up at the top so we print hammer plus a space next we go to the top i is now 1 we create a random number again and this one gets hello and repeat that 10 times until we finish this next we print a new line we create a double variable called start which gets the nanoseconds of the day that we're currently at we create a scanner and get the entire line that the user enters which are all those typed words we end the timer by getting the current nanoseconds again we subtract the difference convert that to seconds get the number of characters that the user entered and then calculate words per minute with the words per minute formula modified a little bit making sure it's as accurate as possible casting this to a double making sure that no data is lost by dividing integers and then converting the entire formula to an integer to get a nice words per minute number and then finally printing out your wpm is whatever that calculation is so i hope this was helpful if you enjoyed it please let me know in the comments but first i'd like to take a quick break to tell you about my experience with squarespace it's really great it's the best i've ever used i've created websites using html by scratch i've made websites with other builders but this has been the best by far it's so easy i got great support the template i used had basically everything and i got my website up in just a few hours all of this i was really into graphic design and i wanted to be like a web designer and man what they are doing here is just really really great i was able to set up donations have downloadable links and everything i need to make my website personal to me if you're working on your personal brand as a young professional or you want to launch an app or host a program like this i really recommend squarespace guys go to squarespace.com for a free trial and when you're ready to launch go to squarespace.com alex lee to save 10 off your first purchase of a website or domain i hope you have a great rest your day and i'll see you in the next video [Music] you