Thread: Difference of java .... and javac + java

java -version
java version "14" 2020-03-17
Java(TM) SE Runtime Environment (build 14+36-1461)
Java HotSpot(TM) 64-Bit Server VM (build 14+36-1461, mixed mode, sharing)

package reusing;
import static net.mindview.util.Print.*;
 
class Cleanser {
  private String s = "Cleanser";
  public void append(String a) { s += a; }
  public void dilute() { append(" dilute()"); }
  public void apply() { append(" apply()"); }
  public void scrub() { append(" scrub()"); }
  public String toString() { return s; }
  public static void main(String[] args) {
    Cleanser x = new Cleanser();
    x.dilute(); x.apply(); x.scrub();
    print(x);
  }
}	
 
public class Detergent extends Cleanser {
	private Cleanser cl = new Cleanser();
  // Change a method:
	public void append(String a){
		cl.append(a);
	}
 
	public void dilute(){
		cl.dilute();
	}	
 
	public void apply(){
		cl.apply();
	}	
 
	public void scrub(){
		cl.scrub();
	}	
 
 // Test the new class:
  public static void main(String[] args) {
    Detergent x = new Detergent();
    x.dilute();
    x.apply();
    x.scrub();
    print(x);
    print("Testing base class:");
    Cleanser.main(args);
  }	
}

Attention, please, to the first line (where "package reusing;");

Then.

Case 1.

michael@michael:~/Downloads/thinking_in_java/TIJ4-code-master/examples/reusing$ java -cp /home/michael/Downloads/thinking_in_java/TIJ4-code-master/examples:. Detergent.java
Cleanser dilute() apply() scrub()

A paradox.

Working. But I think it shouldn't.

Case 2.

michael@michael:~/Downloads/thinking_in_java/TIJ4-code-master/examples/reusing$ javac -cp /home/michael/Downloads/thinking_in_java/TIJ4-code-master/examples:. Detergent.java
michael@michael:~/Downloads/thinking_in_java/TIJ4-code-master/examples/reusing$ java -cp /home/michael/Downloads/thinking_in_java/TIJ4-code-master/examples:. Detergent
Error: Could not find or load main class Detergent
Caused by: java.lang.NoClassDefFoundError: reusing/Detergent (wrong name: Detergent)

Well. This is expected. If I comment out that abovementioned line, the code will work and compile.

Could you tell me why the code worked in case 1?