一个List对象，想把特定的值排在最前面进行处理

今天遇到一个需求，要把list中的某些特定的值排在最前面处理，所以就要对list进行排序，搜索了一下进行总结

首先对List<String> 根据特定的值进行排序

　　　　List<String> list = Arrays.asList("apple", "banana", "cherry", "date", "sss", "fig");
        List<String> specificValues = Arrays.asList("fig", "date");
        // 指定的特定值
        list.sort((a, b) -> {
            if (specificValues.contains(a)) {
                // a在指定值列表中，应排在前面
                return -1;
            } else if (specificValues.contains(b)){
                // b在指定值列表中，应排在前面
                return 1;
            } else {
                // 其他情况保持不变
                return 0;
             }
        });
        System.out.println(list);

　然后对一个List对象根据特定的值进行排序

首先去写一个简单的类
    @Data
    public static class Student{
        private String name;
        private String orderNo;
        private int classNum;
        public Student(String name, String orderNo, int i) {
            this.name = name;
            this.orderNo = orderNo;
            this.classNum = classNum;
        }
    }


然后main方法进行验证
 　　　　List<Student> studentList = new ArrayList<Student>();
        studentList.add(new Student("xiaopang","SN005",1));
        studentList.add(new Student("xiaopang","SN002",1));
        studentList.add(new Student("xiaopang","SN004",1));
        studentList.add(new Student("xiaopang","SN001",1));
        studentList.add(new Student("xiaopang","AN003",1));
        studentList.add(new Student("xiaopang","AN001",1));
        studentList.add(new Student("xiaopang","AN002",1));

        // SN开头的再前面排列
        studentList.sort((student1, student2) -> {
            if (student1.getOrderNo().contains("SN") && student2.getOrderNo().contains("SN")) {
                return student1.getOrderNo().compareTo(student2.getOrderNo());
            } else if (student1.getOrderNo().contains("SN") && !student2.getOrderNo().contains("SN")) {
                return -1;
            } else if (!student1.getOrderNo().contains("SN") && student2.getOrderNo().contains("SN")) {
                return 1;
            } else {
                return student1.getOrderNo().compareTo(student2.getOrderNo());
            }
        });
        studentList.forEach(e->{
            System.out.println(e.toString());
        });