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class IPaddress {
  String ipAddress = new String("172.16.254.1");
  public static void main(String[] args) {
    //..
  }
}

Compiled from "IPaddress.java"
class IPaddress extends java.lang.Object{
java.lang.String ipAddress;

IPaddress();
  Code:
   0:     aload_0
   1:     invokespecial     #1; //Method java/lang/Object."<init>":()V
   4:     aload_0
   5:     new   #2; //class java/lang/String
   8:     dup
   9:     ldc   #3; //String 172.16.254.1
   11:    invokespecial     #4; //Method java/lang/String."<init>":(Ljava/lang/String;)V
   14:    putfield    #5; //Field ipAddress:Ljava/lang/String;
   17:    return

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

}

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

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

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

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