the function String(char) does not exist.

Programming Questions

clankill3r

the function String(char) does not exist.

in Programming Questions • 2 years ago

What is a simple way to make a string out of a char or more chars?

char char1 = 'a';
String bigram = String(char1);

I only can make a string form a 2d char array but i don't need a 2d char array.

Replies(5)

anchnk

Re: the function String(char) does not exist.

2 years ago

Hi,

char char1 = 'a';
String bigram = Character.toString(char1);
println(bigram);
println(bigram.getClass());

char is a primitive data type while String is a java class.
In order to use a method like toString() on a primitive data type, you have to wrap your primitive in a object.
For char, have a look at the Character class.

monkstone

Re: the function String(char) does not exist.

2 years ago

You might want to look at StringBuilder, it is very flexible, and more efficient than StringBuffer.

eg:-

StringBuilder fred = new StringBuilder('a');

fred.append('c');

fred.append(" body ");

fred.append(2);

Note you can append a char an int, a float and a String and more besides.

to get a String just use:-

String myString = fred.toString();

but depending to what you are trying to you may not need to cast to a string

you can for example append a StringBuilder to a PrintStream

clankill3r

Re: the function String(char) does not exist.

2 years ago

A so that is why String is with a capital S, i always wondered.

The stringbuilder is really usefull, i won't use it but it's good to know about it since i'm sure i will use it somewhere in the future.

for now i use the 2d array

char[] chars = new char[2];
    chars[0] = allText.charAt(i);
    chars[1] = allText.charAt(i+1);
    String bigram = new String(chars);

zeeloon

Re: the function String(char) does not exist.

2 years ago

Here's something I learnt while using C++.

I tried it and it worked in Processing also.

String test = "";

char test1 = 'a';

for(int i = 0; i < 10; i++)

{

test += test1;

println(test);

}

And there we go. A simple solution for adding a char to a string.

Correct me if I'm wrong but I think a string is already an array of chars anyway.

kooogy

Re: Re: the function String(char) does not exist.

2 years ago

this is the obvious AND THE WORST way of doing this. under the covers it's creating a new copy of the object every time you add another letter to it.

use StringBuffer / StringBuilder

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