How to determine whether strings are equal in java?

How does java determine whether strings are equal? The following article will introduce to you how to use Java to determine whether strings are equal. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to everyone.

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; [Recommended learning: java course]

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.

2. The equals method is used to compare whether the contents of the strings are the same.

example:

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

will return true.

Note: There are two types of string judgments:

1. To judge whether the addresses are equal, use: ==

2. To judge whether the values ​​are equal. To be equal, use: equals method

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