How to compare strings for equality in java

1. Comparison of strings in java: ==

We often habitually write if(str1==str2), This way of writing may cause problems in java

example1:

String a="abc";String b="abc"

Then a==b will return true. Because the value of a string in Java is immutable, only one copy of the same string will be stored in the memory, so a and b point to the same object;

example2 ：

String a=new String("abc"); String b=new String("abc");

Then a==b will return false. At this time, a and b point to different objects.

example:

String a=new String("abc"); 
String b=new String("abc");
 a.equals(b);

will return true.

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