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Modifying table structure

The meteorological station now needs to update its weather data table to accommodate new temperature forecasts. They want to add forecast temperatures while keeping the actual recorded temperatures for comparison purposes.

The Table, DoubleColumn, and StringColumn classes from Tablesaw have been imported for you.

Este exercício faz parte do curso

Importing Data in Java

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Instruções do exercício

  • Rename the "Temperature" column to "ActualTemp".
  • Add a new "ForecastTemp" column to the table.
  • Print the table structure.
  • Print the first three rows.

Exercício interativo prático

Experimente este exercício completando este código de exemplo.

public class ModifyWeatherTable {
    public static void main(String[] args) {
        StringColumn days = StringColumn.create("Day", 
            "Monday", "Tuesday", "Wednesday");
            
        DoubleColumn temperatures = DoubleColumn.create("Temperature", 
            22.5, 24.0, 23.2);
            
        DoubleColumn precipitation = DoubleColumn.create("Precipitation", 
            0.0, 2.5, 5.2);
            
        Table weatherData = Table.create("WeatherData")
            .addColumns(days, temperatures, precipitation);
        
        // Rename the Temperature column
        weatherData.____("Temperature").____("____");
        
        // Add a new ForecastTemp column
        DoubleColumn forecastTemps = DoubleColumn.create("ForecastTemp", 
            23.0, 25.2, 22.8);
        weatherData = weatherData.____(forecastTemps);
        
        // Print the table structure
        System.out.println(weatherData.____());
        
        // Print the first three rows
        System.out.println(weatherData.____(____));
        
    }
}
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