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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