使用命令提示符出现NoClassDefFoundError

Question

I've been trying to fix this error for the past 30 minutes but I am new to java and I can't find what's wrong by Googling. I've tried setting my classpath, tried java and java -cp . but no luck. I think maybe it's something in my code? I am still using notepad and my .java and .class files are both in the folder where I've set my classpath to.

This is the error I get: http://gyazo.com/dfa7d2c9b319bfa2f4bbf5990cf43ab6.png

C:\\Users\\Karel\\Dropbox\\OOP>java -cp . Thuisopdracht Exception in thread "main" java.lang.NoClassDefFoundError: Thuisopdracht (wrong name: userinput/Thuisopdracht) at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:792) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:14 2) at java.net.URLClassLoader.defineClass(URLClassLoader.java:449) at java.net.URLClassLoader.access$100(URLClassLoader.java:71) at java.net.URLClassLoader$1.run(URLClassLoader.java:361) at java.net.URLClassLoader$1.run(URLClassLoader.java:355) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:354) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:482)

This is my code:

package userinput;
import javax.swing.JOptionPane;
import java.*;
import java.io.*;
import java.util.*;

public class Thuisopdracht {
public static void main(String[] args)  {
    List<String> lijstKaarten = new LinkedList<String>();
    lijstKaarten.add("Harten");
    lijstKaarten.add("Ruitens");
    lijstKaarten.add("Klaveren");
    lijstKaarten.add("Schuppen");

Random rand = new Random();
String stringcomputerKeuze = "";
    int counter = 0;
    while (counter != 5) {
        int computerKeuze = rand.nextInt(lijstKaarten.size());
        stringcomputerKeuze = lijstKaarten.get(computerKeuze);
        counter++;
    }


double computerNummer = (Math.random() * (13 - 1)) + 1;

String typeKaart;
typeKaart = JOptionPane.showInputDialog("Welk type kaart kies je?");

String kaartNummer;
kaartNummer = JOptionPane.showInputDialog("Welke kaartnummer kiest u? (1-13)");

int intKaartNummer = Integer.parseInt(kaartNummer);

System.out.println("De computer koos " + stringcomputerKeuze + " " + computerNummer);
System.out.println("Jij koos " + typeKaart + " " + kaartNummer);


}

}

Answer 1

You didn't use package name userinput

Use userinput.Thuisopdracht

 java -cp . userinput.Thuisopdracht