Prefix Calculator An arithmetic expression is in prefix form when operators are written before their operands. Here are some examples of prefix expressions and the values they evaluate to: Expression Value 12 12 + 2 51 53 * 5 7 35 + 16 4 +3 1 80 An expression (such as 12) that begins with an integer is a prefix expression that evaluates to itself. Otherwise, an expression is a prefix expression if it begins with an operator and is followed by two prefix expressions. In this latter case, the value of the expression is recursively computed from the values of its constituent prefix sub-expressions. Write a program that allows the user to enter prefix expressions in a text field. The program reads the expression, evaluates it, and displays the value in a suitable GUI component. Assume that the user enters expressions that use only positive integers and the two operators + and *. Your program should internally convert the prefix expression into a binary tree before evaluating it.

Describe the difference between a Java Class and a Java Interface. Describe exactly what an Interface contains and does not contain and how we indicate that a class is using an Interface. What is the reason for using Java Interfaces?

please use java to answer the following question

I tried doing some HW myself, but I need help with this question....

create a simple game of your choice in java. Requirements must include: please show code all code to correctly compile. 1. There will need to be a game window implemented as a JFrame.2. Your game must provide instructions to the player.3. You must have at least two different visual elements (buttons, labels, text fields, etc.) – at a minimum!4. There must be a way for the user to interact with the game that causes some visual elements to change their appearance.For example, clicking on a button that represents a playing card could flip the card over to show its value, or correctlytyping in the answer to a riddle could cause a smiley face to appear.5. Your game should have some sort of score or goal. The level of success/total points should be displayed.6. Be sure to design your game using good object-oriented coding principles. Make appropriate use of collections like arrays or ArrayLists and loop over them to avoid unnecessary code repetition. If relevant, consider storing data needed...

QUESTION 3 For an array of objects The array can contain objects of different types at run time but must be defined as the same object type in Java code. The array can contain objects of different types at run time and can be defined as different object types in Java code. The array can't contain objects of different types at run time and must be defined as the same object type in Java code. The array can't contain objects of different types at run time but can be defined as different object types in Java code.

Using the Java programming language, explain how you would utilize each of the following to provide object-oriented features for a quiz application:Programming terminology include classes, instance variables, inheritance, polymorphism, abstract classes, "this," "super," interfaces, and event listeners.

Java Programing

Computer Science for Java Write a GUI program in the language(Java) you have chosen for your SOS project. The GUI of your programmust include text, lines, a check box, and radio buttons. While you are recommended to consider theGUI for the SOS game board, it is not required. In this assignment, any GUI program of your own workis acceptable.Attach here (1) the screenshot of your program execution and (2) the source code of your program.

please use java to answer the following question Implement a program with a GUI and Action listener that looks like the one shown below You should connect to the database ( make sure you have maximum 5 rows in your table) The table should contain of the name, card number and the pin number of the customers who uses the ATM once you enter the card number and the pin number that exist in the database, then by clicking on the Login button, you could show a dialogue dialog box in which it shows the name of the customer and then indicates that that name is login successfully ( Mehrnaz is login successfully). Otherwise, the dialogue box indicates that the information does not exist in the database. The clear button will clear all the information on the GUI.

In java and UML diagram, Please show output and comment code out Source file: Each public class must be contained in a separate Java source file. Only one source file will have a main() method and this source will be named BlackjackGameSimulator.java. Other source/class names are up to you following the guidelines specified so far in the course. The format of the Java source must meet the general Java coding style guidelines discussed so far during the course. Pay special attention to naming guidelines, use of appropriate variable names and types, variable scope (public, private, protected, etc.), indentation, and comments. Classes and methods should be commented with JavaDoc-style comments (see below). Please use course office hours or contact the instructor directly if there are any coding style questions. JavaDocs: Sources should be commented using JavaDoc-style comments for classes and methods. Each class should have a short comment on what it represents and use the @author...

For beginning Java, two things 1) I got this error from my code and how and where can I fix it: Main.java:133: error: reached end of file while parsing } ^ 1 error 2) I was told my code is too long and needs to be separate files. How can I fix this into separate Java files? 3) I need to Draw the UML diagram using MS Word or PowerPoint for the classes and implement them. My original assignment is attached. Here's my code: import java.io.BufferedReader;import java.io.FileReader;import java.io.IOException;import java.time.LocalDate; class Person { private String name; private String address; private String phoneNumber; private String emailAddress; public Person(String name, String address, String phoneNumber, String emailAddress) { this.name = name; this.address = address; this.phoneNumber = phoneNumber; this.emailAddress = emailAddress; } @Override public String toString() { return "Person: " + name + "\nAddress: " + address...

Create three interfaces for the following using java language One method that accepts the number and return if its positive or negative, its square and its cube. Two methods that accepts 2 parameters and return their difference, product and quotient, the largest and smallest. Three methods that accepts 2 to 4 parameters and return their sum. (Use overloaded)