In this program, you'll learn to calculate the average of the given arrays in Java.

```
public class Average {
public static void main(String[] args) {
double[] numArray = { 45.3, 67.5, -45.6, 20.34, 33.0, 45.6 };
double sum = 0.0;
for (double num: numArray) {
sum += num;
}
double average = sum / numArray.length;
System.out.format("The average is: %.2f", average);
}
}
```

When you run the program, the output will be:

The average is: 27.69

In the above program, the `numArray` stores the floating point values whose average is to be found.

Then, to calculate the `average`, we need to first calculate the `sum` of all elements in the array. This is done using a for-each loop in Java.

Finally, we calculate the average by the formula:

average = sum of numbers / total count

In this case, the total count is given by `numArray.length`

.

Finally, we print the average using `format()`

function so that we limit the decimal points to only 2 using `"%.2f"`