线程“main”java.lang.noclassdeffounderror中出现异常：mythread（错误名称：mythread），位于java.base/java.lang.classloader.defineclass1（本机方法），位于java.base/java.lang.classloader.defineclass（classloader）。java:1010)在java.base/java.security.secureclassloader.defineclass（secureclassloader。java:150)在java.base/jdk.internal.loader.builtinclassloader.defineclass（builtinclassloader。java:855)在java.base/jdk.internal.loader.builtinclassloader.findclassonclasspathornull（builtinclassloader。java:753)在java.base/jdk.internal.loader.builtinclassloader.loadclassornull（builtinclassloader。java:676)在java.base/jdk.internal.loader.builtinclassloader.loadclass（builtinclassloader。java:634)在java.base/jdk.internal.loader.classloaders$appclassloader.loadclass（classloaders。java:182)在java.base/java.lang.classloader.loadclass（classloader。java:519)在multirunable.main（multirunable.main）。java:15)
进程已完成，退出代码为1
code:-

class MyThread implements Runnable{
    @Override
    public void run() {
        System.out.println("I am a thread 1 not a thread 2");
    }
}
class MyThread2 implements Runnable{
    @Override
    public void run() {
        System.out.println("I am a thread 2 not a thread 1");
    }
}
public class multirunable {
    public static void main(String[] args) {
        MyThread t1= new MyThread();
        Thread w1= new Thread(t1);
        Mythread2 t2=new Mythread2();
        Thread w2=new Thread(t2);

        w1.start();
        w2.start();
    }
}