在不创建对象的情况下，在方法中返回各种数据类型

public int getNumber() {
    return 10;
}

public int[] getNumbers() {
    int[] numbers = {1, 2, 3, 4, 5};
    return numbers;
}

import java.util.ArrayList;
import java.util.List;

public List<String> getNames() {
    List<String> names = new ArrayList<>();
    names.add("Alice");
    names.add("Bob");
    names.add("Charlie");
    return names;
}

public enum DayOfWeek {
    MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY, SUNDAY;
}

public DayOfWeek getDayOfWeek() {
    return DayOfWeek.MONDAY;
}