String comparisons in Java

There are two types of Java string comparisons:

String str1 = "abc";

String str2 = "abc";

1) str1 = = str2

2) str1.equals (STR2)

The difference between the two is = = compare whether the address space of the two strings is the same. The STR1==STR2 is true because there is a shared mechanism in memory for Java string constants, such as STR1 and str2, which are actually pointing to the same address space. But str1== "ABCD". SubString (0,3) is false.

For example:

The result is:

Str1.equals (STR2) always compares the values of two variables. For example:

The result is:

The mechanism of the two comparisons is different.

Therefore, if you compare the values of two strings, don't use = =

It's amazing.

String comparisons in Java