Develop Reference

I'm trying to understand why I'm receiving "String seems to be unrelated to String[]"

Im creating a project where the area or volume of certain shapes are calculated using dropdown menus in java. I don't have any errors when compiling however I'm getting the message that "Unlikely argument type for equals(): String seems to be unrelated to String[]". As stated, it complies fine, but when running it allows area/volume to be selected, but it does not reach the next option pane to select the shapes.
The message appears on: if (choices.equals("Area"))
and : if (choices.equals("Volume"))
`
import javax.swing.JOptionPane;
public class Shapes
{
public static void main(String[] args)
{
//Dropdown menu for area and volume
String[] choices = {"Area", "Volume"};
String question = (String) JOptionPane.showInputDialog(null, "What would you like to calculate?",
"Shapes", JOptionPane.QUESTION_MESSAGE, null,
choices,
choices[0]);
System.out.println(question);
if (choices.equals("Area"))
{
//user chooses area
String[] choices2D = {"triangle", "parallelogram", "rectangle", "trapezoid", "circle"};
String question2D = (String) JOptionPane.showInputDialog(null, "What shape will you choose?",
"Shapes", JOptionPane.QUESTION_MESSAGE, null,
choices2D,
choices2D[0]);
System.out.println(question2D);
}
//user chooses volume
if (choices.equals("Volume"))
{
String[] choices3D = {"cone", "cylinder", "rectanglular prism", "trapezoid prism", "sphere"};
String question3D = (String) JOptionPane.showInputDialog(null, "What figure will you choose?",
"Shapes", JOptionPane.QUESTION_MESSAGE, null,
choices3D,
choices3D[0]);
System.out.println(question3D);
}
}
}
`
I originally had the options linked to a switch but would keep running into errors, after changing it to an if statement it will compile but not run properly.

Your comparisons are choices.equals(…), but you meant to compare the selection from the dropbox, and this is stored in question. So the comparisons should be question.equals(…).
Alternatively, try this:
import javax.swing.JOptionPane;
public class Shapes
{
public static void main(String... args)
{
//Dropdown menu for area and volume
String[] choices = {"Area", "Volume"};
String question = (String) JOptionPane.showInputDialog( null,
"What would you like to calculate?",
"Shapes",
JOptionPane.QUESTION_MESSAGE,
null,
choices,
choices[0]) ;
System.out.println(question);
switch( question )
{
case "Area":
{
//user chooses area
String[] choices2D = {"triangle", "parallelogram", "rectangle", "trapezoid", "circle"};
String question2D = (String) JOptionPane.showInputDialog( null,
"What shape will you choose?",
"Shapes",
JOptionPane.QUESTION_MESSAGE,
null,
choices2D,
choices2D[0] );
System.out.println( question2D );
break;
}
case "Volume":
{
//user chooses volume
String[] choices3D = {"cone", "cylinder", "rectanglular prism", "trapezoid prism", "sphere"};
String question3D = (String) JOptionPane.showInputDialog( null,
"What figure will you choose?",
"Shapes",
JOptionPane.QUESTION_MESSAGE,
null,
choices3D,
choices3D[0] );
System.out.println( question3D );
break;
}
}
}
}
You can also use the new switch-case syntax and optimise further, by using enums for the various choices.

You are comparing the whole array with a single string. Use choices[0].equals("Area"). Now this will compare choices array with string at index 0 with Area.

Java: getting an index out of bounds exception

Background
Building an Assembler in Java:
I'm trying to read user's input into an ArrayList named v.
If the user enters an instruction that matches one of the String-array table, then the corresponding opcode will be calculated and output into a textfile.
Problem
However, after inputting the nop instruction and trying to add another instruction, I got an index out of bounds exception.
Source Code
//Array of instructions
String table[] = {"LI", " MALSI", "MAHSI", "MSLSI", "MSHSI", "MALSL", "MAHSL",
"MSLSL", "MSHSL", "NOP", "A", "AH", "AHS", "AND", "BCW", "CLZ", "MAX", "MIN",
"MSGN", "MPYU", "OR", "POPCNTH", "ROT", "ROTW", "SHLHI", "SFH", "SFW", "SFHS", "XOR "};
//Array of binary values of the instructions
String table2[] = {"0", "10000", "10001", "10010", "10011", "10100", "10101",
"10110", "10111", "1100000000000000000000000", "1100000001", "1100000010", "1100000011",
"1100000100", "1100000101", "1100000110", "1100000111", "1100001000", "1100001001",
"1100001010", "1100001011", "1100001100", "1100001101", "1100001110", "1100001111",
"1100010000", "1100010001", "1100010010", "1100010011"};
// TODO code application logic here
Scanner s = new Scanner(System.in);
String ins = "";
String fileName = "outfile.txt";
System.out.println("Please enter MISP function, enter Q to Quit: ");
boolean q = true;
String op = "";
int c = 0;
String array[] = new String[64];
//Loop to keep accepting userinput
while (q) {
//accepts the user input
ins = s.nextLine();
//arraylist to hold user input
List<String> v = new ArrayList<String>();
//adds the user input to the arraylist
v.add(ins);//user input to nop opcode
if (v.get(0).toUpperCase().equals("NOP")) {
op = "1100000000000000000000000";
} else if (v.get(1).toUpperCase().equals("LI"))//li opcode
{
String p[] = v[1].split(",", 1);
op = "0";
op += toBinary(p[0], 3);
op += toBinary(p[1], 16);
op += toBinary(p[2], 5);
Error Stacktrace I got
Exception in thread "main" java.lang.IndexOutOfBoundsException:
If you guys could help it would be appreciated.

This loop will never end.
while (q)

Display some information on joptionpane

public class SimpleDialogueBox {
public static void main(String[] args){
String name = JOptionPane.showInputDialog("Name");
String age = JOptionPane.showInputDialog("age");
String address = JOptionPane.showInputDialog("Address");
String contact = JOptionPane.showInputDialog("Contact Number");
JOptionPane.showMessageDialog(null, "User information is", name);
}
}
I want to have a display like this:

Explanation
The method JOptionPane#showMessageDialog takes a regular object to display, a String for example, nothing fancy. From its documentation:
public static void showMessageDialog​(Component parentComponent, Object message) throws HeadlessException
Brings up an information-message dialog titled "Message".
Parameters:
parentComponent - determines the Frame in which the dialog is displayed; if null, or if the parentComponent has no Frame, a default Frame is used
message - the Object to display
So you just have to build the String you want to display and then you pass it to the method. You can concatenate Strings using the + operator:
String lineSep = System.lineSeparator();
String message = "User information is: " + name + lineSep;
And so on. You can also use a StringBuilder for this purpose, it is also more efficient to use it for various reasons.
Code
Here is the full code:
String name = JOptionPane.showInputDialog("Name");
String age = JOptionPane.showInputDialog("age");
String address = JOptionPane.showInputDialog("Address");
String contact = JOptionPane.showInputDialog("Contact Number");
String lineSep = System.lineSeparator();
StringBuilder result = new StringBuilder();
result.append("User information is: ").append(lineSep).append(lineSep);
result.append("Name: ").append(name).append(lineSep);
result.append("Age: ").append(age).append(lineSep);
result.append("Address: ").append(address).append(lineSep);
result.append("Contact Number: ").append(contact);
JOptionPane.showMessageDialog(null, result.toString());
And that is the resulting dialog:

Getting search count in java from an array after comparing against the user input

I am supposed to create an output similar to this:
I have organized my data into an array. To put it simply, I have organized it to
with 8 different POIBook with its individual data.
POIBook[i] = new POI(Type, Place, Rating)
I have no problems calling the right array according to the user input into a JOptionpane display.
However, I have problems trying to determine the total number of search and the search result the user is currently at. Eg. Search 1 of 3
How do I get the total number of the search result and the number the user is currently at?
Edit: To add in the context of the question.
The user will enter a search query in JOptionpane and it will search and return the array containing the search result. For example, searching for "Excitement" will return POIBook[4] , [5] and [6] as a JOptionpane display and as per the output expected in the picture above.
Need help on the following:
How do I show that that 'Search Result - 1/3' when POIBook [4] is returned? and 'Search Result - 2/3' when POIBook[5] is returned etc.?
At the point of display, we will need to know there are 3 results of "excitement" type and it is currently showing the 1st result out of 3.
public static void dataPOI() {
POIBook[0] = new POI("Sightseeing", "River Safari","Wildlife, Panda Bear, Cruise",4.0);
POIBook[1] = new POI("Sightseeing", "Singapore Flyer","Fly!",3.5);
POIBook[2] = new POI("Sightseeing", "Gardens by The Bay","Flower Dome, Cloud Forest",3.5);
POIBook[3] = new POI("Shopping", "Orchard Road","Ion, Mandarin Gallery",4.0);
POIBook[4] = new POI("Excitement", "Universal Studios","Battlestar Galactica, Puss in Boots",4.5);
POIBook[5] = new POI("Excitement", "Marina Bay Sands","Casino, Sky Park Observation Deck",4.0);
POIBook[6] = new POI("Excitement", "Resorts World Sentosa","Trick Eye Museum, Adventure Cove",4.5);
POIBook[7] = new POI("Night Life", "Night Safari","Wildlife, Tram Ride",4.5);
}
My code is as follows.
public static void search() {
String search = JOptionPane.showInputDialog(null, "Please enter your type of attraction", "Place of Interest",
JOptionPane.QUESTION_MESSAGE);
for (int i = 0; i<POIBook.length; i++) {
if(search.equalsIgnoreCase(POIBook[i].type)) {
Object[] options = { "Next >", "Return to Menu" };
int select = JOptionPane.showOptionDialog(null, "Place of interest " + (i+1) + " of 8\n" + POIBook[i].display() +
"\nPress Next for next Place of Interest \n" + "To return, press Return to Menu \n", "Display Places of Interest in Sequence",
JOptionPane.PLAIN_MESSAGE, JOptionPane.PLAIN_MESSAGE, POIBook[i].icon, options, options[1]);
if (select == 1) {
return;
}
}
}
}

Getting values from JOptionPane and using them to create a new instance of a class

I want to retrieve user values from a JOptionPane, I then want to use those values as parameters for the creation of a new instance of another class.
This is my code:
protected void addCar()
{
String[] size = {"Large","Small"};
String[] value = {"Valuable","Not Valuable"};
JTextField regNum = new JTextField();
JList carSize = new JList(size);
JList carValue = new JList(value);
carValue.getSelectedValue();
System.out.println(carSize.getSelectedValue());
Object[] fields =
{
"Registration Number", regNum,
"Car Size", carSize,
"Car Value", carValue
};
JOptionPane.showOptionDialog(rootPane, fields, "Wish To Continue?",
JOptionPane.DEFAULT_OPTION, JOptionPane.YES_NO_OPTION,
null, null, regNum);
}//end addCar

You can simply get the user input from the components you passed to showOptionDialog() after it has returned.
One thing to note: the 4th parameter of showOptionDialog() is the option type so it should be YES_NO_OPTION and not DEFAULT_OPTION. And the 5th parameter is the message type to which you can pass INFORMATION_MESSAGE for example. The other parameters are not relevant in your case.
See this example:
// Your code here to create components
JOptionPane.showOptionDialog(null, fields, "Wish To Continue?",
JOptionPane.YES_NO_OPTION, JOptionPane.INFORMATION_MESSAGE, null, null, null);
System.out.println(fields[0] + ": " + regNum.getText());
System.out.println(fields[2] + ": " + carSize.getSelectedValue());
System.out.println(fields[4] + ": " + carValue.getSelectedValue());
Output:
Registration Number: 1234
Car Size: Large
Car Value: Not Valuable
If you want to use these values to create an instance of another class, you can simply pass them like this:
OtherClass oc = new OtherClass(regNum.getText(), carSize.getSelectedValue(),
carValue.getSelectedValue());
This assumed that your OtherClass has a constructor like this:
public OtherClass(String regNum, String carSize, String carValue) {
}