JAVA DB connection method

A memo of the code to connect to the DB with JAVA

I do not fully understand it, so I will deepen my understanding from here.

public static void main(String[] args) {
		//DB connection
		Connection conn = null;
		PreparedStatement ps = null;
		try {
			conn = DriverManager.getConnection("jdbc:postgresql://localhost:5432/DB name",
			//Define a SQL statement
	        String sql = "INSERT INTO table name(●, ●, ●) values(?,?,?)";
			ps = conn.prepareStatement(sql);
			System.out.println("Connected to DB.");
		} catch (Exception e) {
			System.out.println("I failed.");

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