BD-exp-2/src/main/java/ProvinceMaxDailyPowerReducer.java

import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Reducer;

import java.io.IOException;

public class ProvinceMaxDailyPowerReducer extends Reducer<Text, Text, Text, Text> {

    @Override
    protected void reduce(Text key, Iterable<Text> values, Context context) throws IOException, InterruptedException {
        String maxRecord = null;
        double maxValue = Double.MIN_VALUE;

        for (Text value : values) {
            String[] parts = value.toString().split(":");
            double powerUsage = Double.parseDouble(parts[2]);
            if (powerUsage > maxValue) {
                maxValue = powerUsage;
                maxRecord = value.toString();
            }
        }

        if (maxRecord != null) {
            context.write(key, new Text(maxRecord));
        }
    }
}