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BracketsBalancedOrNot.java
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BracketsBalancedOrNot.java
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import java.util.*;
public class BracketsBalancedOrNot
{
public static void main(String[] args)
{
Scanner in = new Scanner(System.in);
String expression = in.nextLine();
in.close();
if(BalancedOrNot(expression))
{
System.out.println("BRACKET BALANCED");
}
else
{
System.out.println("BRACKET NOT BALANCED");
}
}
private static char reverseBracket(char ch)
{
switch(ch)
{
case ')':
return '(';
case ']':
return '[';
case '}':
return '{';
default:
return '0';
}
}
//this method will throw empty stack exception
private static boolean BalancedOrNot(String expression) throws EmptyStackException
{
Stack<Character> S = new Stack<Character>();
try
{
for(int i=0;i<expression.length();i++)
{
char ch = expression.charAt(i);
if(ch=='(' || ch=='[' || ch=='{')
{
S.push(ch);
}
else if(ch==')' || ch==']' || ch=='}')
{
char rev = reverseBracket(ch);
if(S.empty())
{
throw new EmptyStackException();
}
if(rev == S.peek())
{
S.pop();
}
else
{
return false;
}
}
}
if(S.empty())
{
return true;
}
}
catch(Exception e)
{
System.out.println("STACK IS EMPTY");
}
return false;
}
}