Weird error in Java

[swedishfished]

Hey I'm a new programmer. I had this really weird error. Here is my code:

import javax.swing.JFrame;
import javax.swing.JTextField;
import javax.swing.JPasswordField;
import javax.swing.JOptionPane;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JComboBox;
import javax.swing.plaf.basic.BasicComboBoxRenderer;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.UIManager;
import java.awt.Component;
import java.util.HashSet;
import java.util.Set;

public class tuna extends JFrame {
private JTextField number1;
private JTextField number2;
private JTextField finalanswer;
private JComboBox operation;


public tuna(){
super("Basic Calculator");
setLayout(new FlowLayout());
number1= new JTextField("Enter the first number: ",5);
number2 = new JTextField("Enter the second number: ", 5);
finalanswer = new JTextField(5);
finalanswer.setEditable(false);
String[] operators = {"times", "plus", "minus", "divided by"};
operation = new JComboBox(operators);
add(number1);
add(operation);
add(number2);
add(finalanswer);
thehandler handler= new thehandler();
number1.addActionListener(handler);
number2.addActionListener(handler);
operation.addActionListener(handler);
finalanswer.addActionListener(handler);
}
private class thehandler implements ActionListener{
public void actionPerformed(ActionEvent event){

String answer="";
if(event.getSource()==number1 || event.getSource()==number2 || event.getSource()==finalanswer){

String y=number1.getText();
String x=number2.getText();
int b=Integer.parseInt(y);
int a=Integer.parseInt( x );


int z=a*b;
String[] operators = {"times", "plus", "minus", "divided by"};
String op= (String)operation.getSelectedItem();
switch (op){
case operators[0]:
z=a*b;
case operators[1]:
z=a+b;
case operators[2]:
z=a-b;
case operators[3]:
z=a/b;

}
answer= String.format("The answer is: %d", z);
}
JOptionPane.showMessageDialog(null,answer);

}


}


}

It is supposed to be a calculator. Please help me!
~Swed

[doWhile]

I had this really weird error

And....what is the error? Exception? Compile time? Post all the information

[killutch]

do you have a "public static void main(String[] args){}" method?

[swedishfished]

I have another file:


import javax.swing.JFrame;
class apples {
public static void main(String args[]){

tuna object1=new tuna();
object1.setDefaultCloseOperation(JFrame.EXIT_ON_CL OSE);
object1.setSize(500,500);
object1.setVisible(true);

}
}

[Fubarable]

And yet you still haven't told us what the error message is despite our request. It may be difficult to help you if you ignore our requests for information.

[killutch]

one problem is you are trying to use a switch statement with a string and you can only use most of the number types or enums I believe.

[doWhile]

one problem is you are trying to use a switch statement with a string and you can only use most of the number types or enums I believe.

See The switch Statement (The Java™ Tutorials > Learning the Java Language > Language Basics) ...switch with String was introduced in java 7. In other words, without knowing the error, which I asked for in post #2, it's guessing.

[DarrylBurke]

Forum Rules -- particularly the third paragraph
Guide For New Members
BB Code List - Java Programming Forum

You were already told about the code tags in your previous thread: Random does not repeat itself?

If you didn't understand it, you should have asked.

db

[killutch]

See The switch Statement (The Java™ Tutorials > Learning the Java Language > Language Basics) ...switch with String was introduced in java 7. In other words, without knowing the error, which I asked for in post #2, it's guessing.

Ohhhh thanks for letting me know. I really do need to take some time and read the changes in java 7.

[swedishfished]

Yeah, the error is that I have to change project compliance to JRE 1.7. I can't use strings in switch??
How else would I do it??

[swedishfished]

Also, what is an enum??

[Fubarable]

Yeah, the error is that I have to change project compliance to JRE 1.7. I can't use strings in switch??
How else would I do it??

If you can't use Java 1.7 compliance then use a switch statement that doesn't use Strings, that uses enums or ints instead. Regarding "what is an enum" there are excellent tutorials that describe this much better than we can. I don't have the link on me right now, but Google can help you find it. Please have a look, and then if you have any specific questions or misunderstandings from the tutorials, please bring them back to us.