Hi,
New to Java & hoping you can help me with an error message I am getting.
The compiler says "Cannot find symbol - variable evt" for the first line of the below code.
if (evt.target==calc)
{
clickedCalc();
return true;
}
else
return super.action(evt,obj);
for(int i=0;i<12;i++)
result[i].setText(" "); // clear last calculations
result[3].setText("You input "+nd3);The full code is below. I am writing a program where which will ask for a date and give you three options: Leap Year; Calculate Days and Day of the Week.
When you choose "Calculate Days" it brings up a second set of text files for completion and a new Button called "Calculate". This bit works OK. I now want it to acknowledge that the "Calculate" button has been pressed. All I want at the moment is a line which says "You have entered" and then the new dates but evt.target isn't doing what I was hoping.
Any suggestions really appreciated.
Full Code:
/**
* The two import statements enable classes in these two packages
* to be used without
*/
import java.awt.*;
import java.applet.*;
/**
* The extends keyword enables all of the basic applet methods
* (and those from the applets superclasses)to be used within
* this class
*/
public class EmmaDateApplet extends Applet
{
/**
* The program uses three components from the awt package to be
* used within the class - Label, TextField; Button
*/
private Label label1;
private Label label2;
private TextField dayEntry;
private TextField monthEntry;
private TextField yearEntry;
private TextField dayEntry2;
private TextField monthEntry2;
private TextField yearEntry2;
private Button leap;
private Button dayCount;
private Button dayOfWeek;
private Button calc;
Label result[]=new Label[12]; //creates text fields
/**
*
*Array of labels - label objects
*
*/
public void init()
{
setLayout(null); //create own layout rather than accept Java default layouts
setFont(new Font("Courier",Font.PLAIN,12)); //Java dictionary - bluej - click on "HELP" in BlueJ window - Java class libraries - Font
/**
* Set the size of the applet in pixels. This will be overridden if the
* size of the applet is defined within the html code calling the applet.
*/
resize(500,500); //width, height
/**
* All components are defined in three steps:
* 1.instantiate the object (ie, create)
* 2.add the component to the container (applet)
* 3.set the size and position within the container.
* (the reshape method is also deprecated)
*/
label1=new Label("Please enter a date (dd mm yyyy)");
add(label1);
label1.setBounds(50,200,300,25); // instead of setBounds you can use reshape(135,20,115,25). Where they are in the window relevant to the top left of the window.
//135 = position across, 20 = position down, 115 = width, 25 = height
dayEntry=new TextField(2);
add(dayEntry);
dayEntry.reshape(255,320,50,25);
monthEntry=new TextField(2);
add(monthEntry);
monthEntry.reshape(340,320,50,25);
yearEntry=new TextField(4);
add(yearEntry);
yearEntry.reshape(425,320,50,25);
for(int i=0;i<12;i++) //i just declared in the for loop
{
result[i]=new Label(" ");
add (result[i]);
result[i].setBounds(155,55+18*i,190,18);
}
leap=new Button("Leap");
add(leap);
leap.reshape(50,100,120,30);
dayCount=new Button("Day Count");
add(dayCount);
dayCount.reshape(50,140,120,30);
dayOfWeek=new Button("Day Of Week");
add(dayOfWeek);
dayOfWeek.reshape(50,180,120,30);
super.init();
}
/**
* The action method is inherited (via Applet, Panel, Container) from the
* Component superclass. It's use is now deprecated - replaced by more
* up-to-date methods but is still valuable.
*/
public boolean action(Event evt,Object obj)
{
/**
* If the Compute button has been clicked, run the method clickedCompute
* If neither has been clicked, run all of the default event-handling routines.
*/
if (evt.target==leap)
{
clickedLeap();
return true;
}
else if (evt.target==dayCount)
{
clickedDayCount();
return true;
}
else if(evt.target==dayOfWeek)
{
clickedDayOfWeek();
return true;
}
else
return super.action(evt,obj);
}
public void clickedLeap()
{
int day;
int month;
int year;
day=new Integer(dayEntry.getText()).intValue(); //number added into a text field are not integers. This is why we are using Integer with a capital I (number class)
month=new Integer(monthEntry.getText()).intValue();
year=new Integer(yearEntry.getText()).intValue();
EmmaDate nd1=new EmmaDate (day,month,year); //ndl = nd[one] not l
//EmmaDate should match what you have called it in your Class
EmmaDate nd2=new EmmaDate (day,month,year);
/**
* Clear the last calculations and show all non-zero values on the applet
*/
for(int i=0;i<12;i++)
result[i].setText(" "); // clear last calculations
result[0].setText("You input "+nd1);
result[1].setText("The year "+year);
if(nd1.leapYear())
result[2].setText ("is a leap year");
else
result[2].setText ("is not a leap year");
}
public void clickedDayCount()
{
int day;
int month;
int year;
day=new Integer(dayEntry.getText()).intValue(); //number added into a text field are not integers. This is why we are using Integer with a capital I (number class)
month=new Integer(monthEntry.getText()).intValue();
year=new Integer(yearEntry.getText()).intValue();
EmmaDate nd1=new EmmaDate (day,month,year); //ndl = nd[one] not l
//EmmaDate should match what you have called it in your Class
EmmaDate nd2=new EmmaDate (day,month,year);
EmmaDate nd3=new EmmaDate (day,month,year);
label2=new Label("Please enter second date (dd mm yyyy)");
add(label2);
label2.setBounds(50,400,300,25); // instead of setBounds you can use reshape(135,20,115,25). Where they are in the window relevant to the top left of the window.
//135 = position across, 20 = position down, 115 = width, 25 = height
calc=new Button("Calculate");
add(calc);
calc.reshape(50,450,120,30);
dayEntry2=new TextField(3);
add(dayEntry2);
dayEntry2.reshape(255,350,50,25);
monthEntry2=new TextField(3);
add(monthEntry2);
monthEntry2.reshape(340,350,50,25);
yearEntry2=new TextField(3);
add(yearEntry2);
yearEntry2.reshape(425,350,50,25);
{day=new Integer(dayEntry2.getText()).intValue(); //number added into a text field are not integers. This is why we are using Integer with a capital I (number class)
month=new Integer(monthEntry2.getText()).intValue();
year=new Integer(yearEntry2.getText()).intValue();
{
calc=new Button("Calculate");
add(calc);
calc.reshape(50,450,120,30);
}
super.init();
}
if (evt.target==calc)
{
clickedCalc();
return true;
}
else
return super.action(evt,obj);
for(int i=0;i<12;i++)
result[i].setText(" "); // clear last calculations
result[3].setText("You input "+nd3);
}
public void clickedDayOfWeek()
{
int day;
int month;
int year;
day=new Integer(dayEntry.getText()).intValue(); //number added into a text field are not integers. This is why we are using Integer with a capital I (number class)
month=new Integer(monthEntry.getText()).intValue();
year=new Integer(yearEntry.getText()).intValue();
EmmaDate nd1=new EmmaDate (day,month,year); //ndl = nd[one] not l
//EmmaDate should match what you have called it in your Class
//EmmaDate nd2=new EmmaDate (day,month,year);
}
}