Java中的多重比较

if (obj1.getAge() > obj2.getAge()) {
    // 按年龄比较
} else if (obj1.getName().compareTo(obj2.getName()) > 0) {
    // 按姓名比较
} else {
    // 其他情况
}

public class MyClass implements Comparable<MyClass> {
    private int age;
    private String name;
    
    // 构造方法、getter和setter省略
    
    @Override
    public int compareTo(MyClass other) {
        if (this.age > other.getAge()) {
            return 1;
        } else if (this.age < other.getAge()) {
            return -1;
        } else {
            return this.name.compareTo(other.getName());
        }
    }
}

public class AgeComparator implements Comparator<MyClass> {
    @Override
    public int compare(MyClass obj1, MyClass obj2) {
        return Integer.compare(obj1.getAge(), obj2.getAge());
    }
}

public class NameComparator implements Comparator<MyClass> {
    @Override
    public int compare(MyClass obj1, MyClass obj2) {
        return obj1.getName().compareTo(obj2.getName());
    }
}

List<MyClass> list = new ArrayList<>();
// 添加元素省略
Collections.sort(list, new AgeComparator()); // 按年龄排序
Collections.sort(list, new NameComparator()); // 按姓名排序