qr code scanner java download Extended Array Object Methods in Java

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Table 11-3 Extended Array Object Methods
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Using Arrays with Loops
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Loops allow you to move through array elements without the need to deal with each element one at a time with new lines of code Instead, you can use a loop to cycle through each element of an array and cut down the number of lines you would need to write for a large array To begin, take a look at how you can create the elements of an array using a loop instead of a straight assignment of values
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A loop can be useful in the creation of the elements of an array This is especially useful if you need the viewer to enter the contents of the array for some reason, or if you wish to perform a similar calculation in creating each element Suppose you want the viewer to be able to input the names of the four students from the s_list array of student names introduced earlier in the chapter Using a for loop, you could use the following code to allow the viewer to enter each name:
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A new array with four elements is created
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var s_list = new Array(4); The loop cycles through from 0 to 3 for(var count=0;count<4;count++) { s_list[count] = windowprompt("Enter a name",""); }
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A prompt is given to the viewer each time through the loop, and the text the viewer types in is assigned to the element
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This code creates a new array with four elements It then uses a for loop to assign each value The loop begins by setting the loop s count variable to 0 and will run until the expression count<4 is no longer true Since 1 is added to the value of count each time through (count++), this means that the count variable will have the value of 0 the first time through, 1 the second time, 2 the third time, and 3 the fourth time It doesn t go through another time because count would be equal to 4, which is no longer less than 4
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NOTE
The advantage of starting the count variable at 0 is that you are less likely to become confused when you use the loop The count variable will represent the index number of each array element, so you won t need to subtract 1 from its value as you would if you had started count at 1 instead
Inside the loop, a value is assigned to the element at the index number represented by the count variable each time through The value assigned is the result of what the viewer types in when prompted for a name The viewer will get four prompts in this case and will assign all four of the elements values
11: JavaScript Arrays
Another use for assigning element values with a loop would be to perform a similar calculation that would affect each element For instance, if you wanted an array of ten even numbers, you could use the following code:
An array with ten elements is defined
var even_nums = new Array(10); var a_count = 0; for (var count=0;count<20;count+=2) { even_nums[a_count] = count+2; a_count ++; }
The a_count variable is incremented
A new variable to hold a count incremented by 1 is declared The loop increments by 2, from 0 to 18
The elements are assigned here based on the value of the count variable
By increasing count by 2 each time through, you ensure that an even number is used for your calculation You then assign the value of the count value plus 2 to each array element while going through the loop The use of the a_count variable allows you to keep the array from missing elements based on your count variable being incremented by 2 The a_count variable is incremented by 1 to keep the array index numbers increasing by only 1 (instead of assigning even_nums[0] and then even_nums[2], and skipping over even_nums[1] which is what would have happened if you had used the count variable for the index number slot, rather than a_count, which increases by only 1 each time) The first time through, count is 0, so even_nums[0] is assigned a value of 0+2, or 2 The next time through, count is equal to 2, so even_nums[1] is given a value of 2+2, or 4 This happens until you have ten array elements (index numbers 0 9) that are all even numbers
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