Similarities and differences between equals and "= ="

The same thing ：

1. Are used to compare whether the contents of objects are equal ;

2. All have return values , The return value types are boolean.

Difference ：

1.equals Used to compare the contents of reference types , Cannot be used to compare basic data types ;

2.“==” Usually used to compare basic data types , Compare the memory addresses of the two objects , Generally, it is not used for comparing reference type data .

summary ：

1. If it's some plastic surgery , Such as byte,short etc. , Use “==” To compare

2. If it's an object , Use equals Methods for comparison

3. If it is double,float This type , Then transpose first int Or is it long This type can be used again “==” Compare

4. If it is the contents of the array , Use equals Methods to compare .