"Error: Could not find or load main class My.class"
Solution 1
You should specify the classname instead of the file of the class to load. The difference is a simple matter of removing the .class
extension.
Solution 2
I would use an IDE and you shouldn't get these issues. Compile and run is just a click of the mouse.
BTW to run your program from the command line
java -cp . My
You don't add .class
Solution 3
Position yourself in a directory of your project (you need to have src and bin directories there, assuming you keep sources in src and binaries in bin)
java -cp bin My
James Milner
Updated on June 25, 2022Comments
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James Milner almost 2 years
Im using Java SDK 1.7 on Windows 7 via cmd.exe . Up until a few hours ago everything was working correctly when suddenly I was unable to run my compiled class files, consistently presented with the error in the title.
I seem to be able to compile my My.java file however I am unable to run the resulting class file (My.class). I am constantly given the error "Error: Could not find or load main class My.class". I have tried this with multiple other class files all resulting in the same problem.
My 'Path' environment variable is set to "C:\Program Files (x86)\Java\jdk1.7.0_05\bin" if you were wondering
I have tried reinstalling, creating and setting a classpath variable (no luck), and even directly using the
java -cp . My.class
command.
I have tried these posts all to no avail, hence why I'm posting:
Error: Could not find or load main class
Error: Could not find or load main class- Novice
Could not find or load main class
Java 1.7.0_03 Error: Could not find or load main class
If it makes any difference my code is :
import javax.swing.JOptionPane; class My { public static void main(String[] args) { final double x = 3.2; int i = (int)x; double m = 0; if (x < 4) { String saySomething = JOptionPane.showInputDialog(i); System.out.println(saySomething); } else { String saySomething = JOptionPane.showInputDialog(i); System.out.println("Hello World"); } while (m < 10) { System.out.print(" While Loop "); m++; }; for (i=1; i < 10; i++) { System.out.println("For Loop"); }; } }