How to Solve IllegalArgumentException in Java?
An unexpected event occurring during the program execution is called an Exception. This can be caused due to several factors like invalid user input, network failure, memory limitations, trying to open a file that does not exist, etc.
If an exception occurs, an Exception object is generated, containing the Exception’s whereabouts, name, and type. This must be handled by the program. If not handled, it gets past to the default Exception handler, resulting in an abnormal termination of the program.
IllegalArgumentException
The IllegalArgumentException is a subclass of java.lang.RuntimeException. RuntimeException, as the name suggests, occurs when the program is running. Hence, it is not checked at compile-time.
IllegalArgumentException Cause
When a method is passed illegal or unsuitable arguments, an IllegalArgumentException is thrown.
The program below has a separate thread that takes a pause and then tries to print a sentence. This pause is achieved using the sleep method that accepts the pause time in milliseconds. Java clearly defines that this time must be non-negative. Let us see the result of passing in a negative value.
Program to Demonstrate IllegalArgumentException:
Java
Exception in thread "Test Thread" java.lang.IllegalArgumentException: timeout value is negative at java.base/java.lang.Thread.sleep(Native Method) at Main$1.run(Main.java:19) at java.base/java.lang.Thread.run(Thread.java:834)
In the above case, the Exception was not caught. Hence, the program terminated abruptly and the Stack Trace that was generated got printed.
Diagnostics & Solution
The Stack Trace is the ultimate resource for investigating the root cause of Exception issues. The above Stack Trace can be broken down as follows.
Part 1: This part names the Thread in which the Exception occurred. In our case, the Exception occurred in the “Test Thread”.
Part 2: This part names class of the Exception. An Exception object of the “java.lang.IllegalArgumentException” class is made in the above example.
Part 3: This part states the reason behind the occurrence of the Exception. In the above example, the Exception occurred because an illegal negative timeout value was used.
Part 4: This part lists all the method invocations leading up to the Exception occurrence, beginning with the method where the Exception first occurred. In the above example, the Exception first occurred at Thread.sleep() method.
From the above analysis, we reach the conclusion that an IllegalArgumentException occurred at the Thread.sleep() method because it was passed a negative timeout value. This information is sufficient for resolving the issue. Let us accordingly make changes in the above code and pass a positive timeout value.
Below is the implementation of the problem statement:
How to Solve Equations with java?
Solution 2: Since you’re writing Java, you can use the JAMA package to solve this. Solution 2: If you are looking for an API to read and write to microsoft documents, take a look at Apache POI: http://poi.apache.org/ http://viralpatel.net/blogs/java-read-write-excel-file-apache-poi/ Question: I’m working on a project to create a GUI for an algorithm in MATLAB using an ODE solver (ode45).
How to Solve Equations with java?
I have three equations like the following ones:
How can I find the values of x, y, and z with Java?
String equation1="x+y+z=100;"; String equation2="x+y-z=50;"; String equation3="x-y-z=10;"; int[] SolveEquations(equation1,equation2,equation3) < // to do // how to do? >Do you have any possible solutions or other common frameworks?
You can use determinant to calculate values of x y and z. Logic can be found out here http://www.intmath.com/Matrices-determinants/1_Determinants.php
And then you need to implement it in java using 3 dimensional arrays .
Since you’re writing Java, you can use the JAMA package to solve this. I’d recommend a good LU decomposition method.
It’s a simple linear algebra problem. You should be able to solve it by hand or using something like Excel pretty easily. Once you have that you can use the solution to test your program.
There’s no guarantee, of course, that there is a solution. If your matrix is singular, that means there is no intersection of those three lines in 3D space .
you can use the java matrix package JAMA. See the full page of this example below here
/* *Solving three variable linear equation system * 3x + 2y - z = 1 ---> Eqn(1) * 2x - 2y + 4z = -2 ---> Eqn(2) * -x + y/2- z = 0 ---> Eqn(3) */ import Jama.Matrix; import java.lang.Math.*; public class Main < public Main() < //Creating Arrays Representing Equations double[][] lhsArray = , , >; double[] rhsArray = ; //Creating Matrix Objects with arrays Matrix lhs = new Matrix(lhsArray); Matrix rhs = new Matrix(rhsArray, 3); //Calculate Solved Matrix Matrix ans = lhs.solve(rhs); //Printing Answers System.out.println("x = " + Math.round(ans.get(0, 0))); System.out.println("y = " + Math.round(ans.get(1, 0))); System.out.println("z = " + Math.round(ans.get(2, 0))); > public static void main(String[] args) < new Main(); >> You can also use Commons Math. They have a section of this in their userguide (see 3.4)
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Expression Solver Algorithm with Java
I am trying to create a program that will take in an expression as a String and solve it. So if the input is 3 + 5 it would return 8. I have done majority of the coding, but I’m not sure why I keep getting an UnsupportedOperationExpression in Java. Please help if you can!
import java.util.Arrays; import java.util.List; import java.util.ArrayList; public class FirstPart < public static void main(String[] args) < String sampleString = "1 + 2 + 3 / 2 + 1"; String[] items = sampleString.split(" "); ListitemList = Arrays.asList(items); System.out.println(itemList); for(int zz=0; zz else if(itemList.get(zz).equals("/")) for(int zz=0; zz else if(itemList.get(zz).equals("-")) System.out.println(itemList); > > Thanks again if you can help!
If you construct a List from an array like this
List itemList = Arrays.asList(items) the returned list does not allow to remove an item from the list
itemList.remove(zz + 1); // throws java.lang.UnsupportedOperationException Instead, create an empty list which supports removal and add all the array elements to it:
List itemList = new java.util.ArrayList<>(); java.util.Collections.addAll(itemList, items); Try reading about reverse polish notation algorithm. It seems to do exactly what you need, you only have to implement it.
Quadratic equations solver in java, NaN — not a number — is a value, that represents the result of invalid mathematical operations. Using real numbers, you cannot compute a square root of negative number — so NaN is returned.. Another problem with your solution is /2*a fragment. Division and multiplication have equal priority, so parenthesis are …
Convert Excel solver to java
I am trying to convert a Excel Solver solution to a java app
Solver Parameters: Set Objective: D24 to Max By Changing Variable Cells: C4:C23 Subject to the Constraints: C24 = B24 L24 = N25 (non-negative) GRG Nonlinear I have been goggling for sometime and cannot find a java library to achieve this. Any ideas?
I have tried choco-solver http://www.emn.fr/z-info/choco-solver/
Solver solver = new Solver("my first problem"); // 2. Create variables through the variable factory IntVar x = VariableFactory.bounded("X", 0, 5, solver); IntVar y = VariableFactory.bounded("Y", 0, 5, solver); // 3. Create and post constraints by using constraint factories solver.post(IntConstraintFactory.arithm(x, "+", y, " )); // 5. Launch the resolution process if (solver.findSolution()) < do < prettyOut(); >while (solver.nextSolution()); > I am finding it difficult to relate this to the Excel solver functions, my math is not great
There is a Simplexsolver implementation in Apache Commons Math, but I can’t say anything on performance or possible problem size. Finding non-propertery solutions for optimization problems, can be tricky because it is very difficult to efficently optimize large problem sizes and it is an ongoing field of research with only a hand full of good commerical/research solutions.
If you want to keep excelfiles as input you need to parse the data and convert it. For reading Excel files you can use Apache POI .
If you are looking for an API to read and write to microsoft documents, take a look at Apache POI:
Matlab — In search for a good Java ODE solver, In search for a good Java ODE solver. I’m working on a project to create a GUI for an algorithm in MATLAB using an ODE solver (ode45). So I have to translate the MATLAB code to Java. The problem is the ode45 solver. Java does not seem to have a solver ready to use, and ODE’s are not really my speciality. …
In search for a good Java ODE solver
I’m working on a project to create a GUI for an algorithm in MATLAB using an ODE solver (ode45). So I have to translate the MATLAB code to Java. The problem is the ode45 solver. Java does not seem to have a solver ready to use, and ODE’s are not really my speciality. Am I just not looking good, or are there really no ODE solvers for Java implemented?
If you need a mathematical library for Java, there are several available on the market, either open-source or commercial. These are few ones.
- JMSL by Roguewave, entirely written in Java , which we use succesfully at work
- NAG, written in C but widely documented so that can be used from Java
- Apache commons math, which is open source and contains also a ODE http://commons.apache.org/math/userguide/ode.html
not exactly what you asked but did you consider creating the GUI from matlab instead? it’s not that different from basic java swing /awt things unless you’re looking for fancy GUI things.
Solver in Excel, Solver is an add-in programming tool supported by MS Excel. It is an optimization tool that uses operational research techniques to determine the optimal solutions and fetch the desired outcomes by altering the assumptions for objective problems. It is a type of the ‘What-if-analysis’ that is useful when the user wants to find out …