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40 lines (39 loc) · 936 Bytes
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Copy pathValidParentheses.java
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40 lines (39 loc) · 936 Bytes
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package Stack;
import java.util.*;
class ValidParentheses {
public boolean isValid(String str) {
Stack<Character> s = new Stack<>();
for(int i=0;i<str.length();i++)
{
if(s.size()!=0)
{
if(str.charAt(i)==')' && s.peek()=='(')
{
s.pop();
}
else if (str.charAt(i)==']' && s.peek()=='[')
{
s.pop();
}
else if (str.charAt(i)=='}' && s.peek()=='{')
{
s.pop();
}
else
{
s.push(str.charAt(i));
}
}
else
{
s.push(str.charAt(i));
}
}
if(s.size()==0)
{
return true;
}
else
return false;
}
}