DriverManager.getConnection(url, "username", "password. ");, Javap Mitigation - credentials

Question

Hard-Coding using JavaDB, and netbeans. I wrote a simple table, then I wrote a simple java program to run and connect to the database, code seems to be running well. I wrote the code hard-coded purposefully with the username/password to the database. Wrote the code, an, awesome. I am using terminal and javap -c, with DriverManager.getConnection(url, "username", "password. ");o read all the file, Im hoping that's considered hard-coded hacking, I need a way to mitigate it, or patch it. I was looking at Argon2 for java, but simply can't understand it yet. These are pics of running the code, connection, database, and in terminal I ran javap -c and it red me out the username/password info, how can I block. AlsoI installed a Debugging Plugin into NB tjat worked once and did like javap, but it's only worked once. if some one could help me with it or a dfferent type of mitigation - patch Id really appreciate it.
Main Code with exception:
import java.sql.SQLException;
public class HardCodeMitigation {
public static void main(String[] args) throws SQLException {
// TODO code application logic here
abc a1 = new abc();
}
}
Second code w/DriverMan with passwords Hard-coded
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
class abc {
public abc() throws SQLException {
Connection conn = DriverManager.getConnection("jdbc:derby://localhost:1527/IT_Entity", "cain", "cain");
System.out.println("Connection Created");
}
}
Javap - c showing passwords: Chads - MacBook - Pro: ~chadbyars$ cd / Users / chadbyars / NetBeansProjects / hardcodemitigation / src
Chads - MacBook - Pro: src chadbyars$ javac abc.java
Chads - MacBook - Pro: src chadbyars$ java abc
Error: Main method not found in class abc, please define the main method as:
public static void main(String[] args)
or a JavaFX application class must extend javafx.application.Application
Chads - MacBook - Pro: src chadbyars$ javap - c abc
Compiled from "abc.java"
class abc {
public abc() throws java.sql.SQLException;
Code:
0: aload_0
1: invokespecial #1 // Method java/lang/Object."<init>":()V
4: ldc # 2 // String jdbc:derby://localhost:1527/IT_Entity
6: ldc #3 // String cain
8: ldc # 3 // String cain
10: invokestatic #4 // Method java/sql/DriverManager.getConnection:(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)Ljava/sql/Connection;
13: astore_1
14: getstatic # 5 // Field java/lang/System.out:Ljava/io/PrintStream;
17: ldc #6 // String Connection Created
19: invokevirtual # 7 // Method java/io/PrintStream.println:(Ljava/lang/String;)V
22: return
}
Chads - MacBook - Pro: src chadbyars$