A DESCRIPTION OF THE PROBLEM :
Date date = new Date();
date.setDate(0);
date.setDate(n);

the funciotn "public void setDate(int date)" has one parameter "int" .The frequently-used range is 1-31，but when input 0,the date will change to one month prior。

for example :
today is 2022-07-05 ，i want to get 2022-06-05 ，then i make code：
Date date = new Date();
int day=date .getDate();
date.setDate(0);
date.setDate(date );

the result is 2022-07-05 ，nothing has changed.
and i write something after line 3(date.setDate(0);) just as print or get,the result is 2022-06-05


Date date = new Date();
int day=date .getDate();
date.setDate(0);
date.getMonth();//System.out.println(date);....
date.setDate(date );



REGRESSION : Last worked in version 8

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Date date = new Date();
int day=date .getDate();
date.setDate(0);
date.setDate(date );

ACTUAL -
2022-07-05

FREQUENCY : always