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personal photo album Sometimes the phrase "initializing the array" would be reserved for when we initialize all the elements of the array.For even medium sized arrays, it's unwieldy to specify each element individually. It is often helpful to use for loops to initialize the array. For instance here is a loop that fills an array with the squares of the numbers from 0 to 100.float[] squares = new float[101];for (int i=0; i <= 100; i++) { squares[i] = i*i; } Two things you should note about this code fragment: Watch the fenceposts! Since array subscripts begin at zero we need 101 elements if we want to include the square of 100.

personal photo album Although i is an int it becomes a float when it is stored in squares, since we've declared squares to be an array of floats. One way to avoid fencepost errors is to use the array's built-in length member. This tells you the number of components in the array. In the example above, squares.length equals 101.

personal photo album Thus the loop could have been written like this: float[] squares = new float[101];for (int i=0, i < squares.length; i++) { squares[i] = i*i; } Note that the <= changed to a < to make this work. ShortcutsIt may seem to be a lot of work to set up arrays, particularly if you're used to a more array friendly language like Fortran. Fortunately Java has several shorthands for declaring, dimensioning and strong values in arrays.We can declare and allocate an array at the same time like this:int[] k = new int[3]; float[] yt = new float[7]; String[] names = new String[50]; We can even declare, allocate, and initialize an array at the same time providing a list of the initial values inside brackets like so:int[] k = {1, 2, 3}; float[] yt = {0.

personal photo album

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