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These are the user uploaded subtitles that are being translated: 1 00:00:00,330 --> 00:00:02,370 It's time to learn how to a bitter race. 2 00:00:03,710 --> 00:00:08,810 So far, we use the for loop to run through the length of an array and now you know how to create arrays 3 00:00:08,810 --> 00:00:10,880 as well as how to access their values. 4 00:00:15,960 --> 00:00:17,970 The last step is to learn how to update them. 5 00:00:21,400 --> 00:00:27,090 So inside your Section six folder, create a new file named updating, Erase Java and inside the class, 6 00:00:27,100 --> 00:00:28,570 make sure there's a main method. 7 00:00:34,420 --> 00:00:38,710 Just like we can access array values from their index, we can update them all the same. 8 00:00:41,300 --> 00:00:46,010 So you have an array of three elements, if you want to change an element, just to refer to its index 9 00:00:46,010 --> 00:00:47,300 and then change the value. 10 00:00:47,330 --> 00:00:48,320 It's that simple. 11 00:00:50,690 --> 00:00:56,090 And so I prepared a fine example for us to learn about how to update race, you decided to pursue your 12 00:00:56,090 --> 00:01:01,910 lifelong dream, opened up a cafe, the Java Cafe, your menu starts off pretty simple. 13 00:01:01,910 --> 00:01:06,080 It offers three beverages, the espresso, iced coffee and macchiato. 14 00:01:08,820 --> 00:01:13,350 So inside the class, we're going to store the menu in one array string menu. 15 00:01:16,750 --> 00:01:19,450 Is going to equal an array of three string values. 16 00:01:20,680 --> 00:01:21,490 Espresso. 17 00:01:24,300 --> 00:01:26,100 Iced coffee and macchiato. 18 00:01:33,690 --> 00:01:37,360 Now, I don't know about you, but I'm a bit tired of using loops to print theory. 19 00:01:37,800 --> 00:01:39,630 Java has a function called to string. 20 00:01:39,810 --> 00:01:43,380 It takes your array as an argument and it returns a string that we can print. 21 00:01:48,340 --> 00:01:54,190 So first to write the word erase, wait a bit and click on the first option and what that's going to 22 00:01:54,190 --> 00:01:56,440 do is auto import the utility class. 23 00:01:57,530 --> 00:02:01,220 And so from the erased utility class, we can use the two string method. 24 00:02:03,980 --> 00:02:09,259 The two string method is going to take your array as an argument and return a string copy, we can store 25 00:02:09,259 --> 00:02:10,940 the string copy in a string variable. 26 00:02:20,970 --> 00:02:25,800 And this is really convenient because we can now print the contents of menu as one long string. 27 00:02:41,110 --> 00:02:46,840 Or on the code and nice to string returns a string copy of the array, which you can easily print. 28 00:02:50,550 --> 00:02:54,960 Now, instead of storing the return value, then printing it, I'd rather just print the return value 29 00:02:54,960 --> 00:02:55,680 in one line. 30 00:03:04,650 --> 00:03:10,770 And your coffee is all set up and people are going nuts, but nobody's buying the macchiato, so you 31 00:03:10,770 --> 00:03:12,300 decide to sell lattes instead. 32 00:03:12,930 --> 00:03:17,010 So we're going to do is we're going to update the value at index two and set it equal to latte. 33 00:03:29,680 --> 00:03:30,880 All right, Perfect's. 34 00:03:34,660 --> 00:03:39,310 Now, let's say you want to add more items to the menu, is it possible to change the array length? 35 00:03:39,800 --> 00:03:44,740 And the answer is a big fat no, you cannot change the length of an array. 36 00:03:45,580 --> 00:03:51,070 And that's really unfortunate because your Java cafe is becoming really popular and you need to expand 37 00:03:51,070 --> 00:03:53,180 your menu to accommodate new customers. 38 00:03:53,350 --> 00:03:59,320 There is a lot of demand for house blend and dark roast, but the problem is once you create an array, 39 00:03:59,320 --> 00:04:00,670 you cannot resize it. 40 00:04:01,090 --> 00:04:04,280 The current array only has a room for three items. 41 00:04:04,900 --> 00:04:09,550 So what I can do is create a new array that can store five string values. 42 00:04:15,220 --> 00:04:20,050 So inside the code, I'm going to create a new array that can hold five menu items, string menu. 43 00:04:24,350 --> 00:04:28,220 Is equal to new string that can hold five elements. 44 00:04:30,580 --> 00:04:35,710 The new area has five elements with indexes of zero to four, and by default, the values are null. 45 00:04:40,230 --> 00:04:45,300 Now we're going to create a loop that runs through every item in the old menu, so 4:00 a.m. is equal 46 00:04:45,300 --> 00:04:45,920 to zero. 47 00:04:46,410 --> 00:04:48,740 Remember, indexing an array always starts at zero. 48 00:04:48,760 --> 00:04:52,920 Just at the last index in the array is always one less than the array's length. 49 00:05:04,590 --> 00:05:07,380 And during each run, we're going to print the index I. 50 00:05:14,290 --> 00:05:16,780 As well as the value that we're indexing in the menu. 51 00:05:26,540 --> 00:05:28,190 All right, we're off to a good start. 52 00:05:28,970 --> 00:05:32,510 It runs through the length of the older ray and it prints every element. 53 00:05:34,040 --> 00:05:38,480 Now we need to copy each element from the old array into the new array. 54 00:05:42,080 --> 00:05:43,700 So I'm going to delete this code. 55 00:05:45,080 --> 00:05:47,570 And I'm going to set every element a new menu. 56 00:05:50,630 --> 00:05:53,660 Equal to the element in menu with the same index. 57 00:06:00,770 --> 00:06:07,130 And so from a visual standpoint, this loop runs three times in copies, every value from menu to the 58 00:06:07,130 --> 00:06:08,660 same index as new menu. 59 00:06:22,410 --> 00:06:25,920 To prove this, I'm going to print the contents of new menu as a string. 60 00:06:42,040 --> 00:06:46,450 And as you can see, the first three volumes are copies from the old array, because there was only 61 00:06:46,450 --> 00:06:48,400 three values, the copy from the old array. 62 00:06:49,460 --> 00:06:52,520 But we still have to add house blend and our coast our menu. 63 00:06:55,070 --> 00:06:59,540 So what we'll do is we'll update the element in the next three set that equal to house blend. 64 00:07:09,630 --> 00:07:13,800 And we'll update the elemental index for and set that equal to dark roast. 65 00:07:19,690 --> 00:07:20,740 Rewriting, running the code. 66 00:07:24,600 --> 00:07:30,660 And the Java Cafe is back in business, we successfully updated the menu and we're ready to accommodate 67 00:07:30,660 --> 00:07:31,740 more customers. 68 00:07:33,340 --> 00:07:36,880 From a visual standpoint, you updated the elements and indexes three and four. 69 00:07:40,970 --> 00:07:43,640 Now, your menu is complete and your customers are happy. 70 00:07:47,240 --> 00:07:49,310 In this lesson, you learn how to a bitter race. 71 00:07:50,480 --> 00:07:56,390 You opened up your first cafe, the menu only had three items, your cafe became very popular, so you 72 00:07:56,390 --> 00:07:58,850 decided to add house blend and darkness to your menu. 73 00:07:59,360 --> 00:08:02,210 The problem was you cannot resize an array once you created. 74 00:08:04,460 --> 00:08:07,610 You copied the three elements from menu and to new menu. 75 00:08:15,670 --> 00:08:20,380 And then you manually updated indexes three and four with houseplant and Dark Roast. 7692

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