在Java中实现区间数据频率表的有效方法

class Interval {
    private int start;
    private int end;

    public Interval(int start, int end) {
        this.start = start;
        this.end = end;
    }

    // Getters and setters
}

import java.util.HashMap;
import java.util.Map;

class IntervalFrequencyTable {
    private Map<Interval, Integer> frequencyMap;

    public IntervalFrequencyTable() {
        frequencyMap = new HashMap<>();
    }

    public void incrementFrequency(Interval interval) {
        frequencyMap.put(interval, frequencyMap.getOrDefault(interval, 0) + 1);
    }

    public int getFrequency(Interval interval) {
        return frequencyMap.getOrDefault(interval, 0);
    }
}

IntervalFrequencyTable table = new IntervalFrequencyTable();
Interval interval1 = new Interval(1, 10);
Interval interval2 = new Interval(11, 20);

table.incrementFrequency(interval1);
table.incrementFrequency(interval1);
table.incrementFrequency(interval2);

System.out.println(table.getFrequency(interval1));  // Output: 2
System.out.println(table.getFrequency(interval2));  // Output: 1