charsequence

CharSequence VS String in Java?

由 ぃ、小莉子 提交于 2019-11-26 19:14:44
Programming in Android, most of the text values are expected in CharSequence . Why is that? What is the benefit, and what are the main impacts of using CharSequence over String ? What are the main differences, and what issues are expected, while using them, and converting from one to another? Zarkonnen Strings are CharSequences , so you can just use Strings and not worry. Android is merely trying to be helpful by allowing you to also specify other CharSequence objects, like StringBuffers. Basil Bourque This class diagram may help you see the big picture of string types in Java 7/8. I'm not

CharSequence VS String in Java?

由 血红的双手。 提交于 2019-11-26 08:57:59
问题 Programming in Android, most of the text values are expected in CharSequence . Why is that? What is the benefit, and what are the main impacts of using CharSequence over String ? What are the main differences, and what issues are expected, while using them, and converting from one to another? 回答1: Strings are CharSequences, so you can just use Strings and not worry. Android is merely trying to be helpful by allowing you to also specify other CharSequence objects, like StringBuffers. 回答2:

How to convert a String to CharSequence?

由 |▌冷眼眸甩不掉的悲伤 提交于 2019-11-26 08:47:13
问题 How to convert String to CharSequence in Java? 回答1: Since String IS-A CharSequence , you can pass a String wherever you need a CharSequence , or assign a String to a CharSequence : CharSequence cs = "string"; String s = cs.toString(); foo(s); // prints "string" public void foo(CharSequence cs) { System.out.println(cs); } If you want to convert a CharSequence to a String , just use the toString method that must be implemented by every concrete implementation of CharSequence . Hope it helps.

Why String.replaceAll() in java requires 4 slashes “\\\\” in regex to actually replace “\”?

由 萝らか妹 提交于 2019-11-26 07:26:37
问题 I recently noticed that, String.replaceAll(regex,replacement) behaves very weirdly when it comes to the escape-character \"\\\"(slash) For example consider there is a string with filepath - String text = \"E:\\\\dummypath\" and we want to replace the \"\\\\\" with \"/\" . text.replace(\"\\\\\",\"/\") gives the output \"E:/dummypath\" whereas text.replaceAll(\"\\\\\",\"/\") raises the exception java.util.regex.PatternSyntaxException . If we want to implement the same functionality with
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