JAVA语言-利用java8 stream().map()提取List对象的某一列值及排重
文章目录stream().map()提取List对象的某一列值及排重stream().map()提取List对象的某一列值及排重//测试数据,请不要纠结数据的严谨性List<StudentInfo> studentList = new ArrayList<>();studentList.add(new StudentInfo("李小明",true,18,1.76,Local
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stream().map()提取List对象的某一列值及排重
//测试数据,请不要纠结数据的严谨性
List<StudentInfo> studentList = new ArrayList<>();
studentList.add(new StudentInfo("李小明",true,18,1.76,LocalDate.of(2001,3,23)));
studentList.add(new StudentInfo("张小丽",false,18,1.61,LocalDate.of(2001,6,3)));
studentList.add(new StudentInfo("王大朋",true,19,1.82,LocalDate.of(2000,3,11)));
studentList.add(new StudentInfo("陈小跑",false,17,1.67,LocalDate.of(2002,10,18)));
提取某一列(以name为例)
//输出List
StudentInfo.printStudents(studentList);
//从对象列表中提取一列(以name为例)
List<String> nameList = studentList.stream().map(StudentInfo::getName).collect(Collectors.toList());
//提取后输出name
nameList.forEach(s-> System.out.println(s));
提取age列并排重(使用distinct()函数)
//提取前输出
StudentInfo.printStudents(studentList);
//从对象列表中提取age并排重
List<Integer> ageList = studentList.stream().map(StudentInfo::getAge).distinct().collect(Collectors.toList());
ageList.forEach(a-> System.out.println(a));
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