How to convert CharSequence to String

Question

How can I convert a Java CharSequence to a String

User · Answer

You can directly use String valueOf    String valueOf charSequence    Though this is same as toString   it does a null check on the charSequence before actually calling toString    This is useful when a method can return either a charSequence or null value

User · Answer

By invoking its toString   method      Returns a string containing the characters in this sequence in the same order as this sequence  The length of the string will be the length of this sequence

User · Answer

There is a subtle issue here that is a bit of a gotcha   The toString   method has a base implementation in Object  CharSequence is an interface  and although the toString   method appears as part of that interface  there is nothing at compile-time that will force you to override it and honor the additional constraints that the CharSequence toString   method s javadoc puts on the toString   method  ie that it should return a string containing the characters in the order returned by charAt     Your IDE won t even help you out by reminding that you that you probably should override toString    For example  in intellij  this is what you ll see if you create a new CharSequence implementation  http   puu sh 2w1RJ  Note the absence of toString     If you rely on toString   on an arbitrary CharSequence  it should work provided the CharSequence implementer did their job properly  But if you want to avoid any uncertainty altogether  you should use a StringBuilder and append    like so   final StringBuilder sb   new StringBuilder charSequence length     sb append charSequence   return sb toString

[java] How to convert CharSequence to String?

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