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I have a Java array defined already e.g.
float[] values = new float[3]; I would like to do something like this further on in the code:
values = {0.1f, 0.2f, 0.3f}; But that gives me a compile error. Is there a nicer way to define multiple values at once, rather than doing this?:
values[0] = 0.1f; values[1] = 0.2f; values[2] = 0.3f; Thanks!
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Java does not provide a construct that will assign of multiple values to an existing array's elements. The initializer syntaxes can ONLY be used when creation a new array object. This can be at the point of declaration, or later on.
Declaring and Assigning Variables You can also assign multiple variables to one value: a = b = c = 5; This code will set c to 5 and then set b to the value of c and finally a to the value of b .
To store multiple values, there are two ways of carrying out the task. One way is to assign each value to a single variable, and the other, much more efficient way, is to assign multiple values to a single variable. That is what we call an array. An array is a way to store multiple values in a single variable.
We declare an array in Java as we do other variables, by providing a type and name: int[] myArray; To initialize or instantiate an array as we declare it, meaning we assign values as when we create the array, we can use the following shorthand syntax: int[] myArray = {13, 14, 15};
Yes:
float[] values = {0.1f, 0.2f, 0.3f}; This syntax is only permissible in an initializer. You cannot use it in an assignment, where the following is the best you can do:
values = new float[3]; or
values = new float[] {0.1f, 0.2f, 0.3f}; Trying to find a reference in the language spec for this, but it's as unreadable as ever. Anyone else find one?
61
On declaration you can do the following.
float[] values = {0.1f, 0.2f, 0.3f}; When the field is already defined, try this.
values = new float[] {0.1f, 0.2f, 0.3f}; Be aware that also the second version creates a new array. If values was the only reference to an already existing field, it becomes eligible for garbage collection.
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