间隔设置在java中间隔、java

2023-09-11 23:16:07 作者：热血江湖

予有间隔与整数值[例如列表。 [1，4]，[10，19]等]。有没有一种方法把这些间隔成一些Java集合容器[如。设置]，这样我可以调用容器上的联盟的功能。该联盟的功能应该给我时间间隔，这样如果有2插入间隔重叠那么就应该在输出合并的列表。我试着用番石榴的范围类，但最终合并前相比对对方的所有时段。优雅的方法，这将是真正的AP preciated！这是基于以下的反应是什么我都试过了。的输出为[[1,15]，[17，20]]，这是正确的。我想知道是否有一些退出的API，实现了这样的事情。

I have a list of intervals with integer values [eg. [1, 4], [10, 19] etc.]. Is there a way to put these intervals into some java collections' container [eg. Set] such that I can call a 'union' function on the container. The 'union' function should give me a list of intervals such that if any 2 inserted intervals overlap then they should be merged in the output. I tried using the Range class in Guava but ended up comparing all the intervals against each other before merging. An elegant approach to this would be really appreciated ! Here is what I have tried based on the response below. The output is [[1, 15], [17, 20]], which is correct. I wanted to know if there is some exiting API which implements something like this.

public static void main(String[] args) {
    // mock data
    List<MyIntRange> rng_lst = new ArrayList<Junk.MyIntRange>();
    rng_lst.add(new MyIntRange(1, 10));
    rng_lst.add(new MyIntRange(5, 15));
    rng_lst.add(new MyIntRange(17, 20));

    // sort intervals by start position
    Collections.sort(rng_lst);

    // merge the intervals which overlap
    List<MyIntRange> res_lst = new ArrayList<Junk.MyIntRange>();
    MyIntRange old_rng = null;
    for (MyIntRange cur_rng : rng_lst) {
        if (old_rng == null) {
            old_rng = cur_rng;
        } else {
            if (old_rng.rng.upperEndpoint() < cur_rng.rng.lowerEndpoint()) {
                // this does not over lap with the next one
                res_lst.add(old_rng);
                old_rng = cur_rng;
            } else {
                // overlap
                old_rng = new MyIntRange(old_rng.rng.lowerEndpoint(),
                        cur_rng.rng.upperEndpoint());
            }
        }
    }
    // add the last range
    res_lst.add(old_rng);

    // done!
    System.out.println(res_lst);
}

// wrapper around Guava's Range to make it comparable based on the
// interval's start
public static class MyIntRange implements Comparable<MyIntRange> {
    Range<Integer> rng;

    public MyIntRange(int start, int end) {
        rng = Ranges.closed(start, end);
    }

    public int compareTo(MyIntRange that) {
        int res = -1;
        if (this.rng.lowerEndpoint() > that.rng.lowerEndpoint()) {
            res = 1;
        }
        return res;
    }

    public String toString() {
        return "[" + rng.lowerEndpoint() + ", " + rng.upperEndpoint() + "]";
    }
}

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间隔设置在java中间隔、java

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