Java根据字符串对自定义对象列表进行排序 [英] Java to sort list of custom object on the basis of string

问题描述

class Person 
 {
 private String name;
 private String profession;
}

专业具有值:

• 工程师
• 医生
• 老师
• 学生

我有人员列表，想根据职业对其进行排序.工程师先来，然后是医生，然后是老师，然后是学生.

I have list of person and want to sort it on the basis of Profession. engineer comes first then Doctor and then Teacher and then student.

是否可以使用可比的界面对其进行排序.

Is it possible to sort it with comparable interface.

推荐答案

枚举

如果将 profession 字段替换为 enum :

class Person implements Comparable<Person> {
    private String name;
    private Profession profession;

    // by this we'll define natural ordering based on ordering
    // in which `Profession` enum values are declared
    @Override
    public int compareTo(Person p) {
        return this.profession.compareTo(p.profession);
    } 
}

这是专业枚举:

public enum Profession {
    ENGINEER("engineer"), DOCTOR("Doctor"), TEACHER("Teacher"), STUDENT("student");
    
    private String displayName;
    
    Profession(String dn) {
        this.displayName = dn;
    }

    @Override
    public String toString() {
        return this.displayName;
    }
}

如果您不熟悉Java中的枚举功能，请参见 Oracle教程.

If you are new to the enum facility in Java, see Oracle tutorial.

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