#==Compares references, equals compares values.
1. Comparison of strings in java: ==
We often habitually write Above if(str1==str2), this writing method 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");
2. The equals method is used to compare whether the contents of the strings are the sameexample：
String a=new String("abc");
String b=new String("abc");
a.equals(b);Result Return true.
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