Java根据对象中某个属性排序

方法一：将要排序的对象类实现Comparable<>接口。

public static void main(String[] args) {
    List<student> lists = Lists.newArrayList();
    student student = new student();
    student.setIdx(1);
    student.setName("张三1");
    student.setSex("女1");
    lists.add(student);
    student student2 = new student();
    student2.setIdx(3);
    student2.setName("张三3");
    student2.setSex("女3");
    lists.add(student2);
    student student4 = new student();
    student4.setIdx(5);
    student4.setName("张三5");
    student4.setSex("女5");
    lists.add(student4);
    student student3 = new student();
    student3.setIdx(4);
    student3.setName("张三4");
    student3.setSex("女4");
    lists.add(student3);
    student student1 = new student();
    student1.setIdx(2);
    student1.setName("张三2");
    student1.setSex("女2");
    lists.add(student1);
    Collections.sort(lists);
    System.out.println(lists.toString());
}

static class student implements Comparable<student>{
    Integer idx;
    String name;
    String sex;
    String phone;

    public Integer getIdx() {
        return idx;
    }

    public void setIdx(Integer idx) {
        this.idx = idx;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    public String getPhone() {
        return phone;
    }

    public void setPhone(String phone) {
        this.phone = phone;
    }

    @Override
    public String toString() {
        return "student{" +
                "idx=" + idx +
                ", name='" + name + '\'' +
                ", sex='" + sex + '\'' +
                ", phone='" + phone + '\'' +
                '}';
    }

    @Override
    public int compareTo(student o) {
        return this.idx - o.idx;
    }
}