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  • Stream系列(四)Sorted方法使用

    排序和反向排序

    EmployeeTestCase.java
    package com.example.demo;
    
    import lombok.Data;
    import lombok.ToString;
    import lombok.extern.log4j.Log4j2;
    import org.junit.Test;
    
    import java.util.Collection;
    import java.util.Comparator;
    import java.util.List;
    import java.util.stream.Collectors;
    import java.util.stream.LongStream;
    import java.util.stream.Stream;
    
    import static org.junit.Assert.assertEquals;
    import static org.junit.Assert.assertTrue;
    
    @Log4j2
    public class EmployeeTestCase extends BaseTest{
        @Test
        public void sorted() {
            list.stream().forEach(System.out::println);
    //根据用户名排序 list.stream().sorted(Comparator.comparing(Employee::getName)).collect(Collectors.toList()).forEach(System.out::println);
            //根据Id反向排序
            list.stream().sorted(Comparator.comparingLong(Employee::getId).reversed()
            ).collect(Collectors.toList()).forEach(System.out::println);
        }
    }
    BaseTest.java
    package com.example.demo;
    
    import java.util.Arrays;
    import java.util.List;
    
    public class BaseTest {
        protected static final List<Employee> list = Arrays.asList(
                new Employee(1, "Alex", 1000),
                new Employee(2, "Michael", 2000),
                new Employee(3, "Jack", 1500),
                new Employee(4, "Owen", 1500),
                new Employee(5, "Denny", 2000));
    
        protected static final List<List<Employee>> listFlat = Arrays.asList(
                Arrays.asList(new Employee(1, "Alex", 1000),
                        new Employee(2, "Michael", 2000)),
                Arrays.asList(new Employee(3, "Jack", 1500),
                        new Employee(4, "Owen", 1500)),
                Arrays.asList(new Employee(5, "Denny", 2000)));
    }

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  • 原文地址:https://www.cnblogs.com/JavaWeiBianCheng/p/11941486.html
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