Java array assignment (multiple values)

Question

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:

Answer 1

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?

Answer 2

    public class arrayFloats {
      public static void main (String [] args){
        float [] Values = new float[3];
        float Incre = 0.1f;
        int Count = 0;

        for (Count = 0;Count<3 ;Count++ ) {
          Values [Count] = Incre + 0.0f;
          Incre += 0.1f;
          System.out.println("Values [" + Count + "] : " + Values [Count]);
        }


      }
    }

//OUTPUT:
//Values [0] : 0.1
//Values [1] : 0.2
//Values [2] : 0.3

This isn't the all and be all of assigning values to a specific array. Since I've seen the sample was 0.1 - 0.3 you could do it this way. This method is very useful if you're designing charts and graphs. You can have the x-value incremented by 0.1 until nth time.

Or you want to design some grid of some sort.

Answer 3

values = new float[] { 0.1f, 0.2f, 0.3f };

Answer 4

for example i tried all above for characters it fails but that worked for me >> reserved a pointer then assign values

char A[];
A = new char[]{'a', 'b', 'a', 'c', 'd', 'd', 'e', 'f', 'q', 'r'};

Answer 5

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. But either way, the initializer is initializing a new array object, not updating an existing one.

Answer 6

You may use a local variable, like:

    float[] values = new float[3];
    float[] v = {0.1f, 0.2f, 0.3f};
    float[] values = v;