Objects
Ive tried for hours to get this to compile correctly.
Either i recieve errors regarding the "private static String getName()" method.
or
none of my dialog boxes shows up when i run this program
Can someone point out my mistake that im not seeing?
Please
import javax.swing.JOptionPane;
publicclass Swimmer{
publicstaticvoid main (String [] args){
String swimmerName;
double initTime;
double finalTime;
double bestTime = 0;
swimmerName = getName();
initTime = getInitTime();
finalTime = getFinTime();
bestTime = getBest(initTime, finalTime);
}
}
privatestatic String getName()
{
String name;
name = JOptionPane.showInputDialog(null,"Enter swimmers name");
return name;
}
publicdouble getInitTime()
{
double initialT;
initialT = Double.parseDouble(JOptionPane.showInputDialog(null,"Enter initial time"));
return initialT;
}
publicdouble getFinTime()
{
double finalT;
finalT = Double.parseDouble(JOptionPane.showInputDialog(null,"Enter final time"));
return finalT;
}
publicdouble getBest(double initTime,double finalTime)
{
initTime = 0;
finalTime = 0;
double bestTime = 0;
if (finalTime > initTime)
{
bestTime = initTime;
}
else
{
if (initTime > finalTime)
{
bestTime = finalTime;
}
}
return bestTime;
}
publicvoid output()
{
outString += swimmerName +"\n","Best Time: " + bestTime +" seconds\n";
}
}
[3451 byte] By [
kumiko2ua] at [2007-11-27 1:01:24]
The first errors that I got while compiling your code are related to the use of non-static methods from a static context.
The main method runs in a static context and in Java you can't make a static reference to a non-static method from a static context. So you either declare the methods getInitTime, getFinTime, getBest as static or in your main you declare an instance variable like:
Swimmer main = new Swimmer();
main.getInitTime();
...etc.
This is what i have so far. only errors im receiving now is in my output method
import javax.swing.JOptionPane;
public class Swimmer
{
private String SwimmerName;
private double initTime;
private double finalTime;
private double bestTime = 0;
public String getName()
{
String name;
name = JOptionPane.showInputDialog(null,"Input swimmer's name");
return name;
}
public double getInitTime()
{
double initialT;
initialT = Double.parseDouble(
JOptionPane.showInputDialog(null, "Enter initial time"));
return initialT;
}
public double getFinTime()
{
double finalT;
finalT = Double.parseDouble(
JOptionPane.showInputDialog(null, "Enter final time"));
return finalT;
}
public double getBest(double initTime, double finalTime)
{
initTime = 0;
finalTime = 0;
double bestTime = 0;
if (finalTime > initTime)
{
bestTime = initTime;
}
else
{
if (initTime > finalTime)
{
bestTime = finalTime;
}
}
return bestTime;
}
public void output()
{
outString += swimmerName + "\n";
outString += "Best Time: " + bestTime + " seconds\n";
JOptionPane.showMessageDialog(null, outString);
}
}
That is because the variable outString hasn't been declared and therefore the compiler can't resolve it.
Change the line:
outString += swimmerName + "\n";
to
String outString = "";
outString += SwimmerName + "\n";//Note that you also mispelled SwimmerName as swimmerName
The code will now compile but note that you didn't assign a value to the SwimmerName variable and the compiler assigned a default value to it, which is the null value since this is a reference variable, so be careful.
