How Java’s compareTo() works. ... The compareTo() method will return a positive number if one object is greater than the other, negative if it’s lower, and zero if they are the same.

Java's Calendar class had its day, but the newer LocalDate class does much more. ... Here’s an older way to compare dates using LocalDate and the compareTo method: ...

In Java, sorting simple data ... An object that implements the Comparable interface must call the "implements" keyword first, and then the "compareTo" method must be defined in the Comparable class.