(Match grouping symbols) A Java program contains various pairs of grouping symbols, such as: Parentheses: ( and ) Braces: { and } Brackets: [ and ] Note that the grouping symbols cannot overlap. For example, (a{b)} is illegal. Write a program to check whether a Java source-code file has correct pairs of grouping symbols. Pass the source- code file name as a command-line argument. Solution // GroupingSymbols.java import java.io.*; import java.util.*; public class GroupingSymbols { public static void main(String[] args) { if (args.length != 1) { System.out.println(\"Usage: filename\"); System.exit(0); } File inputFile = new File(args[0]); // Check if file exists if (!inputFile.exists()) { System.out.println(\"File does not exist!\"); System.exit(1); } // Create a stack Stack charstack = new Stack<>(); // arraylist ArrayList symbolarray = new ArrayList<>(); // addinng all symbols to collection Collections.addAll(symbolarray, \"(\", \")\", \"{\", \"}\", \"[\", \"]\"); try(BufferedReader bf = new BufferedReader(new InputStreamReader(new FileInputStream(inputFile)))) { String str; while ((str = bf.readLine()) != null) { for (char character : str.toCharArray()) { String s = character + \"\"; int sIndex = symbolarray.indexOf(s); if (sIndex == -1) continue; if (charstack.size() == 0) { charstack.push(s); } else { int lIndex = symbolarray.indexOf(charstack.peek()); if (sIndex - 1 == lIndex) { charstack.pop(); } else { if ((lIndex & 1) == 1) { System.out.println(\"ERROR at:\" + str); } charstack.push(s); } } } } } catch (FileNotFoundException exception) { System.out.println(\"File not found.\"); exception.printStackTrace(); } catch (IOException exception) { System.out.println(\"IO error.\"); exception.printStackTrace(); } } }.

1. (Match grouping symbols) A Java program contains various pairs of grouping symbols, such as:
Parentheses: ( and )
Braces: { and }
Brackets: [ and ]
Note that the grouping symbols cannot overlap. For example, (a{b)} is illegal. Write a program
to check whether a Java source-code file has correct pairs of grouping symbols. Pass the source-
code file name as a command-line argument.
Solution
// GroupingSymbols.java
import java.io.*;
import java.util.*;
public class GroupingSymbols
{
public static void main(String[] args) {
if (args.length != 1)
{
System.out.println("Usage: filename");
System.exit(0);
}
File inputFile = new File(args[0]);
// Check if file exists
if (!inputFile.exists()) {
System.out.println("File does not exist!");
System.exit(1);
}
// Create a stack
Stack charstack = new Stack<>();
// arraylist
ArrayList symbolarray = new ArrayList<>();
// addinng all symbols to collection
Collections.addAll(symbolarray, "(", ")", "{", "}", "[", "]");
try(BufferedReader bf = new BufferedReader(new InputStreamReader(new
FileInputStream(inputFile))))

2. {
String str;
while ((str = bf.readLine()) != null)
{
for (char character : str.toCharArray())
{
String s = character + "";
int sIndex = symbolarray.indexOf(s);
if (sIndex == -1)
continue;
if (charstack.size() == 0)
{
charstack.push(s);
}
else
{
int lIndex = symbolarray.indexOf(charstack.peek());
if (sIndex - 1 == lIndex)
{
charstack.pop();
}
else
{
if ((lIndex & 1) == 1)
{
System.out.println("ERROR at:" + str);
}
charstack.push(s);
}
}
}
}
}
catch (FileNotFoundException exception)
{
System.out.println("File not found.");

3. exception.printStackTrace();
}
catch (IOException exception)
{
System.out.println("IO error.");
exception.printStackTrace();
}
}
}