Java judgment equals

1. Basic data type with = =

long a = (long) 1234567890; long B = (long) 1234567890; if (A = = b) {    System.out.println ("Basic data type equal");}

2. Wrapper class use Equals or convert to basic data type and then use = =

Long a = (long) 1234567890= (long) 1234567890; if null && a.equals (b)) {    System.out.println ("wrapper class equals");} if null && a.longvalue () = = B.longvalue ()) {    System.out.println ("wrapper class equals");}

3. Object to use equals

Nullnew  String (); if null && a1.length () > 0 && a1.equals (B1)) {    System.out.println ("Object equal");}

Java judgment equals