List.stream().min

一个数据比较的小实验。不知道还能写几个小技巧。mark一下。

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import java.util.Arrays;

import java.util.Comparator;

import java.util.List;

import java.util.Optional;

public class CmpMain {

/**

* Default constructor

*/

public CmpMain() {

}

public static void main(String\[\] args) {

List<Integer> allRows = Arrays.asList(1, 3, 5, 7, 9, 11);

int refNum = 6;

Optional<Integer> minDifRowOpt = allRows.stream()

.min((r1, r2) -> Long.compare(getAbsDif(r1, refNum), getAbsDif(r2, refNum)));

Optional<Integer> minDifRowOpt2 = allRows.stream()

.min(Comparator.comparing(r->getAbsDif(r, refNum)));

System.out.println(minDifRowOpt.get());

System.out.println(minDifRowOpt2.get());

}

public static int getAbsDif(int r, int subNum) {

return Math.abs(r - subNum);

}

}