Question

I am trying to write code to import all characters (including spaces) of a given text file into a single string for analysis. I am using the given files in Java for this, and ran across a strange error while putthing it together. I’m not really familiar with coding at all, and would appreciate clarification. What happens is that in the below code, when I set

text.append(ch);

I have errors of Default constructor cannot handle exception thrown by X, must define explicit constructor;

and when I set text.append(‘ch’);

the above errors go away and my ‘ch’ line just gives invalid char const. error, fixable by removing the ”s.

So I take it I have to construct an explicit constructor for my givens from Java, is this necessary? As I have no idea how to do so, it would be nice to have a roundabout solution.

import java.io.FileInputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.lang.StringBuilder;

public class TextReader //cannot place inputs/outputs of string on this line
{

StringBuilder text = new StringBuilder();
//StringBuilder google
//google end of file check java

InputStream in = new FileInputStream("charfile.txt");
Reader r = new InputStreamReader(in, "US-ASCII");
int intch;
{
while ((intch = r.read()) != -1)
{
    char ch = (char) intch;
        // ...
    text.append(ch); //if I make this a 'ch', the errors above go away, what's the problem?
}
}

}

Answer 1

You need to place your statements in a code block, e.g. main method.

public static void main(String[] args) throws IOException {
    StringBuilder text = new StringBuilder();
    // StringBuilder google
    // google end of file check java

    InputStream in = new FileInputStream("charfile.txt");
    Reader r = new InputStreamReader(in, "US-ASCII");
    int intch;
    {
        while ((intch = r.read()) != -1) {
            char ch = (char) intch;
            // ...
            text.append(ch); 
        }
    }
}

The statements

InputStream in = new FileInputStream("charfile.txt");
Reader r = new InputStreamReader(in, "US-ASCII");

both throw checked exceptions which cannot occur in the class block.