I have array of objects person (int age; String name;).

How can I sort this array alphabetically by name and then by age?

Which algorithm would you use for this ?

解決方案

You can use Collections.sort as follows:

private static void order(List persons) {

Collections.sort(persons, new Comparator() {

public int compare(Object o1, Object o2) {

String x1 = ((Person) o1).getName();

String x2 = ((Person) o2).getName();

int sComp = x1.compareTo(x2);

if (sComp != 0) {

return sComp;

}

Integer x1 = ((Person) o1).getAge();

Integer x2 = ((Person) o2).getAge();

return x1.compareTo(x2);

}});

}

List is now sorted by name, then by age.

String.compareTo "Compares two strings lexicographically" - from the docs.

Collections.sort is a static method in the native Collections library. It does the actual sorting, you just need to provide a Comparator which defines how two elements in your list should be compared: this is achieved by providing your own implementation of the compare method.

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