To convert a float value to a double value in Java, you can simply assign the float value to a double variable.
Here is an example of how you can convert a float value to a double value in Java:
float floatValue = 3.14f; double doubleValue = floatValue;
In this example, we have a float value called floatValue that contains the value 3.14. We assign the float value to a double variable called doubleValue, which automatically converts the float value to a double value.
You can also use the doubleValue method of the Float class to explicitly convert a float value to a double value, like this:
double doubleValue = Float.doubleValue(floatValue);