1 00:00:00,240 --> 00:00:09,130 LUGG that are an orgy Come on now I want to actually refer to the name of this are eastern values OK 2 00:00:09,210 --> 00:00:10,120 brackets. 3 00:00:10,230 --> 00:00:14,850 Now we want to actually for the index number free inside of these. 4 00:00:14,880 --> 00:00:17,340 Ari this index is number 0. 5 00:00:17,340 --> 00:00:24,210 This index is number one and this index is number two and we don't have any index that could be called 6 00:00:24,420 --> 00:00:26,620 index number four here. 7 00:00:26,640 --> 00:00:28,080 This is index number 0. 8 00:00:28,080 --> 00:00:29,470 This is index number one. 9 00:00:29,490 --> 00:00:31,440 And this is indexed number two. 10 00:00:31,470 --> 00:00:37,980 But here in this line of code in line 40 we are actually feeling the index number free which doesn't 11 00:00:38,010 --> 00:00:39,640 exist in this array. 12 00:00:39,690 --> 00:00:42,270 So let's actually go on our project and see what happens. 13 00:00:42,390 --> 00:00:49,720 So as you can see here our application actually crashed and it says unfortunately ABBOTT Well has stopped. 14 00:00:49,880 --> 00:00:50,640 OK. 15 00:00:51,180 --> 00:00:52,460 So what's going on here. 16 00:00:52,560 --> 00:01:00,370 Because we actually deferred to our value OK to an index of this area that actually doesn't exist. 17 00:01:00,390 --> 00:01:06,840 That's why our Actually our application crashed and we cannot refer to an index of an array which doesn't 18 00:01:06,840 --> 00:01:07,450 exist. 19 00:01:07,490 --> 00:01:10,310 Index Number Three doesn't exist in this array. 20 00:01:10,320 --> 00:01:12,440 This is number index number 0. 21 00:01:12,450 --> 00:01:13,640 This is index number one. 22 00:01:13,680 --> 00:01:15,730 And this is index number two. 23 00:01:15,860 --> 00:01:16,480 OK. 24 00:01:16,620 --> 00:01:19,250 We don't have index number free in this area. 25 00:01:19,320 --> 00:01:22,550 It is true that these are the size of this array is free. 26 00:01:22,590 --> 00:01:27,930 But remember programming especially in arrays we count from number zero. 27 00:01:28,040 --> 00:01:28,530 OK. 28 00:01:28,540 --> 00:01:30,780 Number 0 1 2. 29 00:01:30,990 --> 00:01:36,680 We don't have number three here so we cannot refer to that index number free here. 30 00:01:36,690 --> 00:01:37,680 So this is wrong. 31 00:01:37,860 --> 00:01:44,390 We can actually only refer to index number 0 or index number one or index number two. 32 00:01:44,430 --> 00:01:47,730 So let's actually run our project and see what happens. 33 00:01:47,730 --> 00:01:52,140 So as you can see here our application is actually running on the emulator. 34 00:01:52,350 --> 00:01:56,060 And fortunately our application didn't crash this time. 35 00:01:56,100 --> 00:02:00,770 So as you can see here inside that lock now we can see disvalue table here. 36 00:02:00,810 --> 00:02:01,530 OK. 37 00:02:01,860 --> 00:02:07,320 So here you specified that are string values index number 2. 38 00:02:07,590 --> 00:02:11,660 So it can actually return this value table here. 39 00:02:11,670 --> 00:02:11,930 OK. 40 00:02:11,940 --> 00:02:14,640 It's going to start out with this value to that to the lock. 41 00:02:14,640 --> 00:02:16,200 So hopefully that makes sense. 42 00:02:16,230 --> 00:02:23,070 And let's actually comment out these lines of code here and here we can actually output some values 43 00:02:23,580 --> 00:02:30,540 to the screen and we don't need these lines of code here anymore so I just commented out them. 44 00:02:30,540 --> 00:02:32,670 Now let's actually start coding here. 45 00:02:32,700 --> 00:02:33,320 OK. 46 00:02:33,570 --> 00:02:34,520 OK everyone. 47 00:02:34,530 --> 00:02:43,840 Now let's actually create some objects from the text your class takes you to the index or key assignment 48 00:02:43,860 --> 00:02:44,680 operator. 49 00:02:44,850 --> 00:02:50,820 And here we need to actually cast this object to I talk text view object find view by ID are thought 50 00:02:50,940 --> 00:02:54,450 Id DOT takes the index. 51 00:02:54,450 --> 00:02:55,080 OK. 52 00:02:55,590 --> 00:03:03,390 Let's actually create another text view object X the value assignment operator takes a view find view 53 00:03:03,390 --> 00:03:09,000 by id r that Id DOT takes the value. 54 00:03:09,000 --> 00:03:13,010 OK so now let's actually create two string variables. 55 00:03:13,110 --> 00:03:14,160 Strange. 56 00:03:15,530 --> 00:03:22,890 And the name of our idea is all the index value. 57 00:03:23,690 --> 00:03:24,540 OK. 58 00:03:24,590 --> 00:03:27,300 Again let's actually create another string variable. 59 00:03:27,600 --> 00:03:32,620 Old the value. 60 00:03:33,030 --> 00:03:34,260 Value. 61 00:03:34,860 --> 00:03:35,430 OK. 62 00:03:35,670 --> 00:03:40,800 So as you can see here I didn't instantiate these string variables. 63 00:03:40,800 --> 00:03:47,460 So by default these are variables are going to actually fail to a null object inside the memory. 64 00:03:47,480 --> 00:03:51,540 OK because we didn't assign any value to these string variables. 65 00:03:51,570 --> 00:03:53,970 And because our string is actually a class. 66 00:03:54,180 --> 00:03:58,100 So if you are actually Fehring to an object inside the memory. 67 00:03:58,110 --> 00:04:04,020 So here this object actually refers to a null object inside the memory key because we didn't assign 68 00:04:04,020 --> 00:04:07,020 any value to this string object. 69 00:04:07,320 --> 00:04:11,380 So here let's actually create an array of integer numbers in it. 70 00:04:11,550 --> 00:04:16,790 And here let's actually putting a pair of brackets after our type of data type. 71 00:04:16,830 --> 00:04:20,810 We need to actually put in a pair of brackets because we want to actually create an array. 72 00:04:20,820 --> 00:04:23,940 And here let's actually give a name to what are they. 73 00:04:23,940 --> 00:04:26,030 For example int array. 74 00:04:26,070 --> 00:04:26,480 OK. 75 00:04:26,530 --> 00:04:34,290 Assignment operator and here I want to actually create an array by using the new operator here int and 76 00:04:34,290 --> 00:04:35,830 here inside the brackets. 77 00:04:35,910 --> 00:04:38,570 I need to actually specify the size of my array. 78 00:04:38,600 --> 00:04:45,080 Ok so my ARA is going to actually accept 10 values of type integer. 79 00:04:45,140 --> 00:04:50,130 OK so now let's actually create a for loop and here inside the prentices. 80 00:04:50,130 --> 00:04:54,060 Let's actually create an integer variable into counter. 81 00:04:54,640 --> 00:04:55,180 OK. 82 00:04:55,410 --> 00:05:02,220 Assignment operator zero counter less than int array. 83 00:05:02,840 --> 00:05:04,270 That's Len. 84 00:05:04,810 --> 00:05:05,410 OK. 85 00:05:05,650 --> 00:05:08,990 Trantor plus plus. 86 00:05:09,760 --> 00:05:16,980 OK so now as you can see first we created an integer variable called counter and we assigned numbers 87 00:05:16,980 --> 00:05:18,690 zero to this counter. 88 00:05:18,700 --> 00:05:21,010 And here we are actually creating a condition. 89 00:05:21,010 --> 00:05:28,420 And here we are saying that until the counter is less than the value of the length of this array. 90 00:05:28,570 --> 00:05:29,200 OK. 91 00:05:29,530 --> 00:05:33,060 So the length of this area is 10 until this value. 92 00:05:33,060 --> 00:05:36,380 These are the value of this counter is less than number 10. 93 00:05:36,400 --> 00:05:36,770 OK. 94 00:05:36,820 --> 00:05:41,520 0 1 2 3 4 5 6 7 8 9. 95 00:05:41,950 --> 00:05:49,090 So until it reaches number 9 it is going to actually execute this loop and after it reaches number two 96 00:05:49,100 --> 00:05:54,880 and the value of this counter is 10 it's going to actually skip this loop here and then it's going to 97 00:05:54,880 --> 00:05:58,600 actually execute are lines of code after this loop here. 98 00:05:58,600 --> 00:05:59,020 OK. 99 00:05:59,050 --> 00:06:05,110 So here we are saying that increment the value of this counter variable Bhagavan every time this loop 100 00:06:05,140 --> 00:06:06,400 is executed OK. 101 00:06:06,520 --> 00:06:10,810 So now inside the loop I can actually put in some more lines of code. 102 00:06:10,990 --> 00:06:13,970 So first of all it's actually a instantiate. 103 00:06:13,990 --> 00:06:24,500 This all takes the index value assignment operator ticks the index dot get text that string. 104 00:06:24,750 --> 00:06:25,250 OK. 105 00:06:25,480 --> 00:06:29,690 Here we are actually getting the value of the CTX the index takes you. 106 00:06:29,710 --> 00:06:30,500 So this is. 107 00:06:30,790 --> 00:06:34,250 So here let's actually click on this clear cache here. 108 00:06:34,450 --> 00:06:38,100 So this is the value of these RTX the index. 109 00:06:38,190 --> 00:06:38,580 OK. 110 00:06:38,680 --> 00:06:41,760 This is TSTO the stakes for you as you can see here. 111 00:06:42,100 --> 00:06:44,040 And this is the X the value takes. 112 00:06:44,050 --> 00:06:44,700 OK. 113 00:06:44,920 --> 00:06:47,960 And here is our line of code as you can see inside the loop. 114 00:06:47,980 --> 00:06:49,970 I am getting the value of those takes. 115 00:06:50,030 --> 00:06:50,420 OK. 116 00:06:50,440 --> 00:06:55,050 And I am putting that value inside this all the x the index value. 117 00:06:55,330 --> 00:07:01,660 And let's actually instantiate this or Tillich's the value of value assignment operator TXI the value 118 00:07:02,470 --> 00:07:06,330 that get text dot to a string. 119 00:07:06,670 --> 00:07:07,390 OK. 120 00:07:07,420 --> 00:07:14,560 And here I am actually getting the value of that RTX the value here and I am actually converting that 121 00:07:14,560 --> 00:07:15,970 value to a string value. 122 00:07:16,150 --> 00:07:21,330 And here I am actually assigning value to these all the value value OK. 123 00:07:21,430 --> 00:07:27,560 So now here it's actually putting some values to these in the index text view. 124 00:07:27,580 --> 00:07:30,910 And these takes the value takes view. 125 00:07:30,910 --> 00:07:36,620 So here I can just I've been to the index dot set text here. 126 00:07:37,030 --> 00:07:47,000 And then inside the parenthesis I can just type in all it takes the index value OK plus counter. 127 00:07:47,110 --> 00:07:47,590 OK. 128 00:07:47,710 --> 00:07:51,080 Plus two double quotes and inserted double quotes. 129 00:07:51,100 --> 00:07:53,900 I can just put in a new line character OK. 130 00:07:53,980 --> 00:08:01,460 So back for Slash and I am actually putting the all the value of the index takes view plus counter. 131 00:08:01,570 --> 00:08:02,640 OK. 132 00:08:02,660 --> 00:08:04,910 And I am actually putting the counter here. 133 00:08:04,930 --> 00:08:10,780 The value of this counter like Index and here I am actually creating a newline character OK. 134 00:08:10,930 --> 00:08:15,590 So after each execution of this loop is going to actually create a newline character and then it's going 135 00:08:15,590 --> 00:08:19,210 to put values below each other. 136 00:08:19,210 --> 00:08:23,720 So let's actually 5:47 the value that said text. 137 00:08:24,040 --> 00:08:28,230 All takes the value value plus. 138 00:08:28,320 --> 00:08:28,530 OK. 139 00:08:28,540 --> 00:08:35,580 And this time I want to actually output the value that is inside of this area here and that is. 140 00:08:35,730 --> 00:08:39,920 And that value is related to that specific index that specific counter. 141 00:08:40,120 --> 00:08:44,830 So here I again just refer to the name of this int array here. 142 00:08:45,070 --> 00:08:52,360 I need to actually put in a pair of brackets and I want the value that is inside of that counter. 143 00:08:52,390 --> 00:08:52,820 OK. 144 00:08:52,870 --> 00:09:00,070 And here I need to actually put in a plus operator and two double quotes here and a new line character. 145 00:09:00,070 --> 00:09:04,780 So here as you can see I am referring to the name of this order takes the value of value valuable as 146 00:09:04,780 --> 00:09:05,920 you can see here. 147 00:09:05,980 --> 00:09:08,840 This idea has that value. 148 00:09:08,870 --> 00:09:15,430 This has the value that is inside the text the value takes you plus and I put a plus operator here in 149 00:09:15,430 --> 00:09:18,370 order to concatenate this value with other values. 150 00:09:18,580 --> 00:09:24,400 So here we are actually referring to the name of this area 8 into the sub counter. 151 00:09:24,490 --> 00:09:25,070 OK. 152 00:09:25,090 --> 00:09:30,520 So it's going to actually give me the value that is inside of that specific counter. 153 00:09:30,520 --> 00:09:31,480 Ok for example. 154 00:09:31,570 --> 00:09:36,310 So the first time this loop is going to be executed or the value of this counter is zero. 155 00:09:36,310 --> 00:09:36,800 OK. 156 00:09:36,820 --> 00:09:39,010 And it's going to actually check this condition. 157 00:09:39,030 --> 00:09:41,930 So sort Chouteau is less than an hour late that lent. 158 00:09:41,980 --> 00:09:44,340 So it is true zero is a little less than 10. 159 00:09:44,530 --> 00:09:46,530 And then it's going to go inside the loop. 160 00:09:46,570 --> 00:09:52,300 And then after executing these two lines of code here after assigning these values to these valuable 161 00:09:52,340 --> 00:09:58,210 it's going actually execute these lines of coheres can actually output this value discounted value to 162 00:09:58,210 --> 00:10:02,500 their screen or to the index value plus counter. 163 00:10:02,770 --> 00:10:09,690 OK so the counter is this right your number zero and then I actually create a newline character and 164 00:10:09,690 --> 00:10:16,710 then it's going to output this value to the screen or all takes the value value OK plus it Eric Cantor 165 00:10:16,710 --> 00:10:18,100 counter is 0. 166 00:10:18,120 --> 00:10:24,740 So the value of that is inside of the counter zero is for example and not Baraki is going to outputs 167 00:10:24,750 --> 00:10:25,810 that value to the screen. 168 00:10:25,830 --> 00:10:29,100 So let's actually it on our project and see the results. 169 00:10:29,100 --> 00:10:33,810 So as you can see here now our application is actually running on this emulator here. 170 00:10:33,810 --> 00:10:34,410 Okay. 171 00:10:34,860 --> 00:10:40,770 And here on the left hand side we can see the indexes and on the right hand side we can see the values 172 00:10:40,830 --> 00:10:42,780 that are actually related to these indexes. 173 00:10:42,780 --> 00:10:43,150 Okay. 174 00:10:43,230 --> 00:10:49,740 So because we didn't assign any value to the indexes of this array that the values that are actually 175 00:10:49,740 --> 00:10:52,020 related to these indexes are zero. 176 00:10:52,020 --> 00:10:54,160 The default value is zero. 177 00:10:54,290 --> 00:11:00,510 OK for the indexes of the rate that we actually create here we just specify that this array is going 178 00:11:00,510 --> 00:11:07,900 to have 10 places 10 empty places for the values that we can specify to those places. 179 00:11:07,890 --> 00:11:08,420 Okay. 180 00:11:08,760 --> 00:11:15,960 And for example a place that is actually the index 0 means the place number 0 has the value zero. 181 00:11:15,960 --> 00:11:21,190 So this is the default value the place number one has the value 0 and so on. 182 00:11:21,510 --> 00:11:28,070 So now it's actually here after creating or out a let's actually assign a value to one of those indexes 183 00:11:28,080 --> 00:11:33,120 for example int array and then here we can actually put in a pair of brackets. 184 00:11:33,330 --> 00:11:38,170 And for example I can I want to I want to actually assign a value to the index number five. 185 00:11:38,360 --> 00:11:38,850 OK. 186 00:11:38,940 --> 00:11:42,930 And now I can actually assign an integer value to this index. 187 00:11:42,930 --> 00:11:47,870 For example number 27 and this actually is on our project and see what happens. 188 00:11:47,940 --> 00:11:48,920 OK everyone. 189 00:11:48,990 --> 00:11:55,170 Now as you can see here we can see the value that is actually related to this index. 190 00:11:55,400 --> 00:11:55,850 OK. 191 00:11:55,920 --> 00:11:57,960 So hopefully that makes sense. 192 00:11:58,380 --> 00:12:01,210 And I think that's enough for this tutorial. 193 00:12:01,230 --> 00:12:05,320 Make sure that you actually create this application over and over. 194 00:12:05,370 --> 00:12:12,330 So that are creating alleys in Java because a second nature arrays are very important so you need to 195 00:12:12,330 --> 00:12:16,930 know how to work with arrays in order to create great and great applications. 196 00:12:16,930 --> 00:12:17,320 OK. 197 00:12:17,340 --> 00:12:18,470 So this is really important. 198 00:12:18,480 --> 00:12:22,140 And this section of the course I think is the most important section of the course. 199 00:12:22,230 --> 00:12:23,820 Thank you very much for watching. 200 00:12:24,150 --> 00:12:29,400 And if you have any questions please post the discussion in the course and then I'll do my best to answer 201 00:12:29,400 --> 00:12:33,030 your questions and I'll see you in the next tutorial.