題目：
https://blog.csdn.net/qq_55056705/article/details/124563498
自定義排序步驟：
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定義所需要的物件
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實作Comparable介面（可指定泛型）
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重寫compareTo方法（傳入的引數相當于compare(Object o1, Object o2)中的o2，如果是o1-o2為順序排序，o2-o1則是倒序排序）
關鍵代碼：
class People implements Comparable<People> { private Integer id; private String code; private Integer age; public People(Integer id, String code, Integer age) { this.id = id; this.code = code; this.age = age; } public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getCode() { return code; } public void setCode(String code) { this.code = code; } public Integer getAge() { return age; } public void setAge(Integer age) { this.age = age; } @Override public int compareTo(People people) { if (people.getAge()!=this.getAge()){ return people.getAge()-this.getAge(); }else { return this.getId()-people.getId(); } } }
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標籤：Java
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