The difference between CompareTo and compare in Java

Compare

As can be seen from here, compare is a class in the comparator interface, and then look at the explanation in the source code

Compares its-arguments for order. Returns a negative integer,
Zero, or a positive integer as the first argument is less than, equal
To, or greater than the second

If the first argument is less than the second parameter, a negative number is returned, or 0 if it is equal, and a positive number is returned if it is greater.

Look at the CompareTo method again

First, he is a method in the comparable interface,

The string class then inherits the comparable interface and implements the Comparteto method

To see the implementation of the specific method:

 Public intcompareTo (String anotherstring) {intLen1 =value.length; intLen2 =anotherString.value.length; intLim =math.min (Len1, len2); CharV1[] =value; CharV2[] =Anotherstring.value; intK = 0;  while(K <Lim) {CharC1 =V1[k]; CharC2 =V2[k]; if(C1! =C2) {                returnC1-C2; } k++; }        returnLEN1-Len2; }

So, compare is a comparator method, and CompareTo is the concrete way to implement this interface.

The difference between CompareTo and compare in Java