A non-empty object is judged in Java.

A non-empty object is judged in Java.

Java often encounters a time when judgment is not empty.
Sometimes I judge the non-empty but still report the null pointer, why.?
Judgment is usually judged two times. Similar to:

Java code

1. Org o = new org ();
2. if (O.getid () =null &&!o.getid.equals ("")) {
3. Org oo= Orgservice.findbyid (O.getid ());
4. if (oo! = null) {
5. Tbvorg.setorgparname (Org.getorgname ());
6. }
7. }

Validation must first be verified as null. Before you can call the Equals method
Otherwise, a null pointer is reported. Because if the object is null. The Equals method cannot be called

A non-empty object is judged in Java.