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Java - Can constants store and calculate other variables within them?


By : LIz Miller
Date : October 17 2020, 01:08 AM
I wish this help you A "constant", in computer programming terms, is a value that is known at compile time, based entirely on the program's source code. This value can be the result of some calculation, but the only inputs allowed are other constants. For example, you could define a constant with value 2 * Math.PI.
In Java, constants are declared as static final fields of a class - that is, outside all methods, such as where you put form.
code :


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How does java support instance variables of java enum constants?


By : user2561157
Date : March 29 2020, 07:55 AM
Does that help
I mean it "seems" the static enum constant is using a non-static instance variable which is not possible normally?
code :
public final class Member extends java.lang.Enums<Members> {
    public static final Members A = new Member(1) {
        public String toString() { return "A:"+size; }
    };
    public static final Members B = new Member(2) {
        public String toString() { return "B:"+size; }
    };
    public static final Members C = new Member(3) {
        public String toString() { return "C:"+size; }
    };
    private final int size;
    protected Member(int size) { this.size = size; }
}

Why final variables are not constants Java?


By : jack2222
Date : March 29 2020, 07:55 AM
wish helps you A variable that is final but not static has a constant value for one object, meaning that it can only be modified by a constructor of that object. But for different objects the variable can still have different values. That's why it is not a constant in a strict sense.
Another reason is that you don't have to create an object to access a static variable. Why should you create an object in order to access a constant?

Using Global Constants to store environment variables


By : hemptyshelly
Date : March 29 2020, 07:55 AM
I wish did fix the issue. I usually do exactly the same or two other things, depending on the size of the application. If it is something small, I use your approach. However,these are the other approaches I use.
First Approach:
code :
public function GetPassword as string
   GetPassword = [set_password]
end function
Private Const p_First_COLUMN_TO_FILL = 8

Public Property Get FIRST_COLUMN_TO_FILL() As Long
    FIRST_COLUMN_TO_FILL = p_First_COLUMN_TO_FILL
End Property

How to store textfile data as variables and then calculate values using those variables?


By : user3410700
Date : March 29 2020, 07:55 AM
Hope this helps Most of your code is already there, however it is lacking the conversion to float from the string read from file. Besides that, a simple loop should do the job.
code :
t = []
v = []

with open('data.txt', 'r') as f:
    for line in f:
        first, second = line.split()
        t.append(float(first))    # note the 'float' conversion here
        v.append(float(second))

# Now, we will use an array to store the acceleration values
# The first element in this array will be zero, so:
a = [0]

# To calculate the acceleration, we will do delta(v)/delta(t),
# To calculate any delta, we will iterate each array, and pick
# the "current" and "previous" element. For this reason, our index
# will start at 1 skipping the first (otherwise we'll go to -1)

# these steps could be combined, but I feel it helps beginners to see
# the process

for i in range(1, len(v)):    # since v,t have same length, just pick either
    delta_v = v[i] - v[i-1]
    delta_t = t[i] - t[i-1]
    acc = delta_v / delta_t
    a.append(acc)

# Now we can print
# 'zip' combines the two arrays as columns of a matrix,
# so now "x" picks a value from "t", and "y" from "a" 
# as we iterate
for x, y in zip(t, a):
    print("%s  %s" % (x,y))

# or save to file:
with open("acceleration.txt", 'w') as f:
    for x, y in zip(t, a):
        f.write("%s  %s\n" % (x,y))

How to store Java constants for use in building key value combinations


By : TOMER COHEN
Date : March 29 2020, 07:55 AM
I wish did fix the issue. Let's say I want to store potential keys and potential values for those keys as constants. How can I achieve this? Or should I avoid it altogether? , If they are all constants, you might use an Enum:
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