Random rand = new Random();
int r = rand.nextInt(200);
Connection co2 = null;
PreparedStatement ps2 = null;
ResultSet rs2 = null;
try {
    Class.forName("com.mysql.jdbc.Driver");
    co2 = DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "");
    ps2 = co2.prepareStatement("insert into class" + " values (?, ?, ?, ?)");
    ps2.setInt(1, r);
    ps2.setString(2, rs.getString("superClass"));
    ps2.setString(3, "Object");
    ps2.setString(4, null);
    ps2.execute();
    System.out.println("insert passé");
    list.add(rs.getString("superClass"));
} finally {
    close(co2, ps2, rs2);
}

Random rand = new Random();
int r = rand.nextInt(200);
Connection co2 = null;
PreparedStatement ps2 = null;
ResultSet rs2 = null;
try {
    Class.forName("com.mysql.jdbc.Driver");
    co2 = DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "");
    ps2 = co2.prepareStatement("insert into class" + " values (?, ?, ?, ?)" + "insert into typeclass" + " values (?, ?, ?, ?)");
    ps2.setInt(1, r);
    ps2.setString(2, rs.getString("superClass"));
    ps2.setString(3, "Object");
    ps2.setString(4, null);
    ps2.setInt(5, r);
    ps2.setString(6, rs.getString("superClass"));
    ps2.setString(7, "Object");
    ps2.setString(8, null);
    ps2.execute();
    System.out.println("insert passé");
    list.add(rs.getString("superClass"));
    } finally {
        close(co2, ps2, rs2);
    }

MySQLSyntaxErrorException near "insert into typeclass values (174, "JFrame", "Object", null)"