Converting a char to uppercase

Question

String lower   Name toLowerCase    int a   Name indexOf     0   String first   lower substring 0  a   String last   lower substring a 1   char f   first charAt 0   char l   last charAt 0   System out println l     how would i get the F and L variables converted to uppercase

User · Answer

Have a look at the java lang Character class  it provides a lot of useful methods to convert or test chars

User · Answer

f   Character toUpperCase f   l   Character toUpperCase l

User · Answer

Since you know the chars are lower case  you can subtract the according ASCII value to make them uppercase   char a    a   a -  32  System out println  a is     a     a is A   Here is an ASCII table for reference

User · Answer

The easiest solution for your case - change the first line  let it do just the opposite thing   String lower   Name toUpperCase       Of course  it s worth to change its name too

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You can use Character toUpperCase   for this   char fUpper   Character toUpperCase f   char lUpper   Character toUpperCase l     It has however some limitations since the world is aware of many more characters than can ever fit in 16bit char range  See also the following excerpt of the javadoc      Note  This method cannot handle  supplementary characters  To support all Unicode characters  including supplementary characters  use the toUpperCase int  method

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Instead of using existing utilities  you may try below conversion using boolean operation   To upper case    char upperChar    l   amp  0x5f   To lower case      char lowerChar    L    0x20     How it works   Binary  hex and decimal table   ------------------------------------------   Binary       Hexadecimal       Decimal   -----------------------------------------   1011111       0x5f              95       ------------------------------------------   100000        0x20              32       ------------------------------------------   Let s take an example of small l to L conversion   The binary AND operation   l  amp  0x5f   l character has ASCII 108 and 01101100 is binary represenation       1101100  amp   1011111 -----------    1001100   76 in decimal which is   ASCII   code of L   Similarly the L to l conversion    The binary XOR operation   L   0x20      1001100    0100000 -----------    1101100   108 in decimal which is   ASCII   code of l

User · Answer

I think you are trying to capitalize first and last character of each word in a sentence with space as delimiter   Can be done through StringBuffer   public static String toFirstLastCharUpperAll String string       StringBuffer sb new StringBuffer string           for int i 0 i lt sb length   i                if i  0    sb charAt i-1         for first character of string each word                    i  sb length  -1    sb charAt i 1          for last character of string each word                 sb setCharAt i  Character toUpperCase sb charAt i          return sb toString

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If you are including the apache commons lang jar in your project than the easiest solution would be to do   WordUtils capitalize Name    takes care of all the dirty work for you  See the javadoc here  Alternatively  you also have a capitalizeFully String  method which also lower cases the rest of the characters

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System out println first substring 0 1  toUpperCase      System out println last substring 0 1  toUpperCase

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You can apply the  toUpperCase   directly on String variables or as an attribute to text fields  Ex  -   String str  TextView txt   str toUpperCase      will change it to all upper case OR txt append str toUpperCase     txt setText str toUpperCase

[java] Converting a char to uppercase

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