Setting Java Classpath to Load a Class File -

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I'm new to Java, and I have no doubt that to issue a different file program in a specific file . For example, I have to load MyClass located in a third party jar file, which is / mylib / MyClass.class, so I tried to turn to: 

  java -jar mainprog .jar -classpath "/ mylib" MyClass

but I get this error: 

  Thread exceptions "main" java.lang.NoClassDefFoundError: MyClass due to: MyClass on java.net.URLClassLoader $ 1.run (URLClassLoader.java:221) on java.security.AccessController.doPrivileged (Native method) for Java: java.lang.ClassNotFoundException. On net.URLClassLoader.findClass java.lang.ClassLoader.loadClass (ClassLoader.java:324) to (URLClassLoader.java:209) sun.misc.Launcher $ AppClassLoader.loadClass (Launcher.java:294) on java.lang.ClassLoader Cloud Loader on Java .lang.ClassLoader.loadClassInternal (ClassLoader.java:337)

What am I doing wrong?

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When you use "- jar" , only class-path attribute is defined in the jar INF mETA inside the file / MANIFEST.MF file Classpath Will affect

This will also ignore the MyClass argument (or more specifically): the form of an argument for the main category defined in MANIFEST.MF Explain in.

If you want to call a class with that jar like this: 

  java -cp mainprog.jar: / mylib MyClass // You can use it on windows: java-cp mainprog.jar; / mylib MyClass

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