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Need help writing a console program
0 Answer(s)      2 years and 2 months ago
Posted in : Java Beginners


I need help cant seems to figure it out! Write a program that consists of three classes. The first class will be the actual program.

The second class will simply convert a string to lower case.

The third class will have three methods:

public static String trimmed(String str)

and

public static String trimmed(String str, int len)

and

public static String squeeze(String str)

The 1st trimmed method will return str without leading or trailing whitespace and will return an empty string if str is null.

The 2nd trimmed method will return the first len characters after trimming the string. The 2nd method must make use of the 1st method.

The squeeze method will replace all sequences of 2 spaces with 1 space.

The program will read a file containing the data below (cut and paste it into notepad and save it), and will display each line:

as entered but trimmed and squeezed. as entered but trimmed, squeezed, and shortened to 10 characters as entered but trimmed, squeezed, converted to lower case, and shortened to 20 characters. Data (copy after this line down to (not including) the line that says end data, you will have 5 lines): This is a test, this is only a test!

This test is a test of your Java programming skills! xyz ABCDEFGHIJKLMONPQRSTUVWXYZ1234567890-=_+ ! end data

Here is what i got so far.

import java.io.File;

import java.util.Scanner;

public class {

String s1 = "ABC"; String s2 = LowerCase.convertToLowerCase(s1) }

//this method will convert convert string to lower case

} public class LowerCase { public static String convertToLowerCase(String input) { if (input==null) return ""; return input.toLowerCase(); } }

}

//This method uses an anonymous class to return a lower-cased

//version of a String s

public String toLower(final String s) {

return new Object() {

public String toString() {

return s.toLowerCase();

}

}.toString();

}

public static class StringManipInner {

//This method will trim the white space from the

//beginning and end of the string

public static String trimmed(String s) {

if (s == null) {

return "";

}

return s.trim();

}

//This method will return a trimmed string of size len

public static String trimmed(String s, int len) {

String retVal = StringManipInner.trimmed(s);

if (len > retVal.length()) {

len = retVal.length();

}

return retVal.substring(0,len);

}

//This method will convert all double spaces to a single space

public static String squeeze(String s) {

return s.replace(" ", " ");

}

}


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