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String parts is String[6]:
["231", "CA-California", "Sacramento-155328", "aleee", "Customer Service Clerk", "Alegra Keith.doc.txt"]
But when I compare parts[0] with "231":
"231" == parts[0] the above result is false,
I'm confused, so could anybody tell me why?
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This is because the two Integer objects have the same value, but they are not the same object.
In String, the == operator is used to comparing the reference of the given strings, depending on if they are referring to the same objects. When you compare two strings using == operator, it will return true if the string variables are pointing toward the same java object. Otherwise, it will return false .
We can compare String in Java on the basis of content and reference. It is used in authentication (by equals() method), sorting (by compareTo() method), reference matching (by == operator) etc. There are three ways to compare String in Java: By Using equals() Method.
Using the “==” operator for comparing text values is one of the most common mistakes Java beginners make. This is incorrect because “==” only checks the referential equality of two Strings, meaning if they reference the same object or not.
The == operator compares the object references, not the value of the Strings.
To compare the values of Strings, use the String.equals method:
"231".equals(parts[0]); This is true with any other object in Java -- when comparing values, always use the equals method rather than using the == operator.
The equals method is part of Object, and should be overridden by classes which will be compared in one way or another.
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