importjava.util.ArrayList;importjava.util.Collections;importjava.util.List;publicclassComparatorExample{publicstaticvoidmain(String[]args){List<Integer>numbers=newArrayList<>();numbers.add(5);numbers.add(2);numbers.add(8);numbers.add(1);// 使用自定义比较器进行升序排序Collections.sort(numbers,newInte...
Example to compare the Developer objects using their age. Normally, you use Collections.sort and pass an anonymous Comparatorclasslikethis: TestSorting.javapackagecom.mkyong.java8;importjava.math.BigDecimal;importjava.util.ArrayList;importjava.util.Collections;importjava.util.Comparator;importjava.util.Lis...
一旦创建了比较器,我们可以将其传递给排序方法,例如Collections.sort()或Arrays.sort(),来对对象进行排序。 import java.util.ArrayList; import java.util.Collections; import java.util.List; public class ComparatorExample { public static void main(String[] args) { List<Integer> numbers = new ArrayList<...
Example to compare the Developer objects using their age. Normally, you use Collections.sort and pass an anonymous Comparator class like this : TestSorting.java package com.mkyong.java8; import java.math.BigDecimal; import java.util.ArrayList; import java.util.Collections; import java.util.Comparat...
Comparator example: sorting Strings by lengthWe introduced the notion of a Comparator in Java, which is used to specify the sort order of a particular class. Let's start with an example to sort Strings by their length. We thus want to write a Comparator that compares Strings. So the ...
importjava.util.Comparator; publicclassComparatorExample{ publicstaticvoidmain(String[] args){ ArrayList<Integer> lst =newArrayList<>(); lst.add(1); lst.add(8); lst.add(-2); lst.add(5); System.out.println(lst); /*Comparator<>接口中的compare()也是一个泛型抽象方法(声明):public interface...
Comparable和Comparator接口只是定义了两个元素的比较规则, 对数组元素进行排序,借助于冒泡排序法。 手写一个冒泡排序法 冒牌排序法: 冒泡排序算法图解.png privatestaticint[]bubbleSort(int[]ints){//1. 确定数组长度intlen=ints.length;//2。 外层需要len-1次比较for(inti=0;i<(len-1);i++){// 3. ...
1. Sort without Lambda Example to compare theDeveloperobjects using their age. Normally, you useCollections.sortand pass an anonymousComparatorclass like this : TestSorting.java packagecom.mkyong.java8;importjava.math.BigDecimal;importjava.util.ArrayList;importjava.util.Collections;importjava.util.Compar...
stream() .sorted(Comparator.reverseOrder()) .collect(Collectors.toList()); System.out.println(sortedList); Program output. [9, 8, 7, 6, 5, 4, 3, 2, 1] 2.3. Sort Stream Elements in Custom Order using Comparator In the given Java example, we are sorting a stream of integers using...
5. Java group by sort – Chained comparators This is most basic example to use multiple comparators to sort list objects by multiple fields. In this approach, an ordered list of comparators is created and passed to a method which iterates over comparators and use each comparator to sort the...