如何对带有数字键的对象进行降序排序？

var arr = [5, 2, 8, 1, 9];
arr.sort(function(a, b) {
  return b - a;
});
console.log(arr); // 输出 [9, 8, 5, 2, 1]

dict = {1: 'apple', 3: 'banana', 2: 'orange'}
sorted_keys = sorted(dict, reverse=True)
for key in sorted_keys:
  print(key, dict[key])

class MyObject implements Comparable<MyObject> {
  private int key;
  private String value;

  // 构造函数和其他方法

  @Override
  public int compareTo(MyObject other) {
    return other.getKey() - this.getKey();
  }
}

List<MyObject> list = new ArrayList<>();
// 添加对象到列表
Collections.sort(list);