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These are the user uploaded subtitles that are being translated: 1 00:00:01,490 --> 00:00:03,860 We can use for loops to run code many times. 2 00:00:05,110 --> 00:00:10,240 So far, you learn to store that information using variables, control how your code runs, using a 3 00:00:10,240 --> 00:00:16,120 false and switch and organize your code into functions, every step that you take is a step closer to 4 00:00:16,120 --> 00:00:18,190 becoming a professional Java developer. 5 00:00:18,880 --> 00:00:25,060 And your next step to Java greatness is to control how many times a piece of code needs to run, essentially 6 00:00:25,060 --> 00:00:26,470 by running your code in a loop. 7 00:00:30,440 --> 00:00:33,200 So in this lesson, I'm going to teach you how to use a for loop. 8 00:00:36,210 --> 00:00:41,910 First thing you need to do is create a new Java project named Section five and wow, time really does 9 00:00:41,910 --> 00:00:42,660 fly, doesn't it? 10 00:00:42,690 --> 00:00:44,160 We're already at Section five. 11 00:00:44,640 --> 00:00:50,370 And inside the project, create a new file named for Leubsdorf, Java, and as always, make sure the 12 00:00:50,370 --> 00:00:51,630 class has a main method. 13 00:00:56,990 --> 00:01:01,910 Loops can control how many times a block of code needs to run, and there are two types of loops. 14 00:01:01,940 --> 00:01:04,340 There's the for loop and then there's the wire loop. 15 00:01:04,849 --> 00:01:07,940 As we dive deeper into the section, I want you to keep this in mind. 16 00:01:08,390 --> 00:01:12,500 Use a for loop when you know in advance how many times you need to run a piece of code. 17 00:01:13,370 --> 00:01:19,040 I'm going to repeat this one more time, use a for loop when you know in advance how many times you 18 00:01:19,040 --> 00:01:20,210 need to run a piece of code. 19 00:01:21,200 --> 00:01:26,930 This is really important information that I'm going to put in your cheat sheet, OK, and use a while 20 00:01:26,930 --> 00:01:32,150 loop when it's not clear how many times you need to run a piece of code, because unlike the for loop, 21 00:01:32,150 --> 00:01:36,770 the wire loop doesn't have any fancy counters to keep track of how many times a chunk of code needs 22 00:01:36,770 --> 00:01:37,240 to run. 23 00:01:37,850 --> 00:01:41,670 It's just going to keep running the code as long as some condition remains true. 24 00:01:42,890 --> 00:01:44,930 So we'll start with the for loop. 25 00:01:47,340 --> 00:01:52,950 The Furler can run code a specific number of times, it loops through code for an exact number of times 26 00:01:52,950 --> 00:01:54,240 and then the loop breaks. 27 00:01:59,150 --> 00:02:00,890 Now, the for Loop has three parts. 28 00:02:01,300 --> 00:02:07,790 There is the start, this loop starts running with I equalling one, and then there's this top condition. 29 00:02:08,389 --> 00:02:12,320 This loop is going to keep running as long as I is less than or equal to three. 30 00:02:12,320 --> 00:02:13,640 And then the loop stops. 31 00:02:15,320 --> 00:02:21,590 Then there's the step size I is going to increase by a step size of one every time the loop runs. 32 00:02:22,130 --> 00:02:26,090 Now, this might seem like a lot to digest, but it's going to become easier once we start using for 33 00:02:26,090 --> 00:02:26,900 loops in our code. 34 00:02:29,850 --> 00:02:34,440 So we're going to add this for a loop in Maine, the for loop is going to start running with equaling 35 00:02:34,440 --> 00:02:36,360 one and I equals one. 36 00:02:37,450 --> 00:02:43,330 And it's going to keep running as long as I is less than or equal to three, and every time it runs, 37 00:02:43,330 --> 00:02:45,520 we're going to increase the value by one. 38 00:02:47,680 --> 00:02:53,830 OK, so my stop condition is I is less than or equal to three because I want the code to run three times. 39 00:02:56,740 --> 00:03:01,510 You're going to see exactly how this plays out really soon, but every time this loop runs, we're going 40 00:03:01,510 --> 00:03:04,270 to print the counter I print line I. 41 00:03:07,050 --> 00:03:08,130 I'm going to run the code. 42 00:03:18,640 --> 00:03:23,860 And as I predicted, the code runs three times, the code keeps running as long as it is smaller than 43 00:03:23,860 --> 00:03:25,900 or equal to three and then the loop breaks. 44 00:03:30,780 --> 00:03:36,840 So the counter starts at 1:00, the condition is true, the code runs and after the code runs, AA plus 45 00:03:36,840 --> 00:03:38,610 plus increases the counter by one. 46 00:03:39,000 --> 00:03:44,070 Now we're at the second run and this is going to keep happening as long as I is less than or equal to 47 00:03:44,070 --> 00:03:44,430 three. 48 00:04:03,640 --> 00:04:08,320 Once I isn't smaller than or equal to three anymore, the condition is going to be false and the loop 49 00:04:08,320 --> 00:04:09,070 is going to break. 50 00:04:13,640 --> 00:04:17,510 Now, here's how it looks from a visual perspective, the for loop starts with a counter. 51 00:04:17,540 --> 00:04:18,200 I have one. 52 00:04:18,470 --> 00:04:24,230 So the condition is true and the code runs in after the code runs, I plus plus increases the counter 53 00:04:24,230 --> 00:04:25,070 value by one. 54 00:04:25,430 --> 00:04:26,840 The counter is now two. 55 00:04:27,170 --> 00:04:31,970 And this is just going to keep happening until I is no longer less than or equal to three. 56 00:04:41,770 --> 00:04:46,780 And once that happens, the condition is going to be false and the brakes were essentially designed 57 00:04:46,780 --> 00:04:48,910 iroko to only run three times. 58 00:04:53,040 --> 00:04:57,630 In this lesson, you coded a for loop, and it controls how many times a block of code needs to run. 59 00:05:00,690 --> 00:05:05,100 Philip is useful when you know in advance, when you know exactly how many times you want to run your 60 00:05:05,100 --> 00:05:05,490 code. 61 00:05:08,080 --> 00:05:13,150 We wrote a for loop and we designed it to run exactly three times the for loop starts with equaling 62 00:05:13,150 --> 00:05:17,050 one and the loop keeps running as long as I smaller than or equal to three. 63 00:05:23,670 --> 00:05:24,930 And then the loop breaks. 64 00:05:28,490 --> 00:05:31,400 And now that you know how to use for loops, the world is your oyster. 65 00:05:31,610 --> 00:05:36,600 There are so many apps that you can now build, so strap in and get ready for the workbook bonanza. 66 00:05:36,890 --> 00:05:37,610 It's coming up. 6807

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