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class Hardcoded {
  String password = new String("guest""guest");
  public static void main(String[] args) {
    //..
 }
}

Compiled from ""Hardcoded.java""
class Hardcoded extends java.lang.Object{
java.lang.String password;

Hardcoded();
  Code:
   0:	aload_0
   1:	invokespecial	#1; //Method java/lang/Object."<init>"&quot;&lt;init&gt;&quot;:()V
   4:	aload_0
   5:	new	#2; //class java/lang/String
   8:	dup
   9:	ldc	#3; //String guest
   11:	invokespecial	#4; //Method java/lang/String."<init>"&quot;&lt;init&gt;&quot;:(Ljava/lang/String;)V
   14:	putfield	#5; //Field password:Ljava/lang/String;
   17:	return

public static void main(java.lang.String[]);
  Code:
   0:	return

}

class Password {
  public static void main(String[] args) throws IOException {
    char[] password = new char[100];	
    BufferedReader br = new BufferedReader(new InputStreamReader(
      new FileInputStream(""password.txt"")));

    // Reads the password into the char array, returns the number of bytes read 
    int n = br.read(password);  
    // Decrypt password, perform operations
    for(int i = n - 1; i >>= 0; i--) {  // Manually clear out the password immediately after use 
      password[i] = 0;	 
    }
    br.close();
  }
}

public final Connection getConnection() throws SQLException {
  return DriverManager.getConnection(""jdbc:mysql://localhost/dbName"", "username""username", "password""password");
}

// Username and password are read at runtime from a secure config file
public final Connection getConnection() throws SQLException {
  return DriverManager.getConnection(""jdbc:mysql://localhost/dbName"", username, password);
}