I’m currently working on an assignment where I have to fix java code compilation errors in an IDE (VSCode) and then push the changes to a GitHub repository.

The program should start running and then crash (We are going to work on debugging the reason for that crash in a later assignment), but I cannot find out why the program isn’t working.

Here is what the classes look like:

package cs252;

import java.util.Arrays;

/**
 * Class to compute median averages.
 * 
 * The median average of a sequence of numbers is the "middle" value
 * if you have an odd number of values or the midpoint between the two middle
 * values if you have an even number of values.
 */
public class Median {

    double[] values;

    public Median(double[] values) {
        this.values = values;
    }

    /**
     * Compute the median average of the supplied values.
     * @return the median average
     */
    double median() {
        double[] sorted = new double[values.length];
        for (int i = 0; i < values.length; ++i) {
            sorted[i] = values[i];
        }
        Arrays.sort(sorted);
        int middle = values.length / 2;
        if (values.length % 2 == 0) {
            return 0.5 * (sorted[middle - 1] + sorted[middle]);
        } else {
            return sorted[middle];
        }
    }
}

package cs252;

import java.util.Arrays;

public class TestMedian {

    public static void main(String[] args) {
        if (args.length == 0) {
            System.err.println("Supply the number of tests to run on the command line.");
            System.exit(1);
        }
        int n = Integer.parseInt(args[0]);
        boolean result = test(n);
        if (result) {
            System.out.println("Passed all " + n + " tests.");
        } else {
            System.out.println("Failed one or more tests.");
        }
    }

    private static boolean test(int numTests) {
        double[] inputs = { 1.0, 4.0, 6.5, 2.4, 24.0, 5.0 };
        double[] expected = { 1.0, 2.5, 4.0, 3.7, 5.25, 4.75 }; // Corrected expected median averages

        for (int i = 0; i < numTests; ++i) {
            double[] trimmedInputs = Arrays.copyOf(inputs, i + 1);
            Median med = new Median(trimmedInputs);
            double avg = med.median();
            if (avg != expected[i])
                return false;
        }
        return true;
    }
}

We were also supposed to create a Run Configuration in your IDE to execute the program, supplying the number 5 as a command-line argument after fixing the errors and this is what I did for mine

{
    "version": "0.2.0",
    "configurations": [
        {
            "type": "java",
            "name": "Current File",
            "request": "launch",
            "mainClass": "${file}"
        },
        {
            "type": "java",
            "name": "TestMedian",
            "request": "launch",
            "mainClass": "cs252.TestMedian",
            "args": ["5"], // Specify the command-line argument here
            "projectName": "idesAsst_469d298e"
        }
    ]
}

I was expecting to see something along the lines of “Passed all ” + n + ” tests.” in the output followed by the program crashing but this is the output I got when running the program instead:

cd /home/cs_jrich096/UnixCourse/idesAsst ; /usr/bin/env /usr/lib/jvm/java-17-openjdk-amd64/bin/java -agentlib:jdwp=transport=dt_socket,server=n,suspend=y,address=localhost:41297 -XX:+ShowCodeDetailsInExceptionMessages -cp /home/cs_jrich096/.vscode-server/data/User/workspaceStorage/dbb270263255ab5da80e24ff3634cd86/redhat.java/jdt_ws/idesAsst_469d298e/bin cs252.TestMedian 5 
Failed one or more tests.

I tried to run the command to finish the assignment after pushing my results to git and this is the output I got:

Which IDE did you use to complete this assignment?
1. VSCode
2. Eclipse
1
Checking VSCode...
javac -g -d bin -cp src:bin src/cs252/TestMedian.java
jar cfe median.jar cs252.TestMedian -C bin/ .

Something is wrong with the generated executable at (eval 1) line 129.