Append char arrays to create string

Question

How do i add all charAcro[] to create a string? example charAcro[0] = a, charAcro[1] = b, charAcro[2] = c, which makes the string abc

 while(resultSet.next()){
                    String Name = rs.getString(1);
                    String Acro=Name;
                    String delimiterAcro = " ";
                    String[] temp =null;
                    char[] charAcro = null;
                    temp = Name.split(delimiterAcro);
                    for(int i = 0;i<temp.length;++i){
                    charAcro[i] = temp[i].charAt(0);
                    //SOME CODE HERE?
                    }

      }

Adeel Ansari · Accepted Answer · 2012-05-24 03:18:12Z

7

There is a String constructor available that takes a char array,

char data[] = {'a', 'b', 'c'};
String str = new String(data);

While I'm at it, look into Java Naming Conventions. Class names should be nouns, in mixed case with the first letter of each internal word capitalized. Whereas variables are in mixed case with a lowercase first letter. Internal words start with capital letters.

For example in your code snippet you have,

String Name = rs.getString(1);

which is bad, if not wrong.

Moreover, you are likely to have a NullPointerException at line,

charAcro[i] = temp[i].charAt(0);

as you didn't initialise the array. Below is the code which should work for you.

String name = rs.getString(1);
String[] temp = name.split(" ");
char[] charAcro = new char[temp.length];
for (int i = 0; i < temp.length; ++i) {
    charAcro[i] = temp[i].charAt(0);
}
System.out.println(new String(charAcro));

edited May 24, 2012 at 3:18

Adeel Ansari

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answered May 24, 2012 at 2:42

mkoryak

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1 Comment

David B Over a year ago

I answered with a StringBuilder, but this is a much more elegant solution. Kudos.

RoneRackal · Accepted Answer · 2012-05-24 02:43:57Z

4

There's a constructor for String that accepts a char array, so just do:

String string = new String(charAcro);

answered May 24, 2012 at 2:43

RoneRackal

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