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Keep one count say cnt. If you encounter '(' increment counter by one. If you encounter ')' decrement by one. Perform increment or decrement in synchronized method. if counter is negative it means that parantesis dont match.
- 11anony.mous99 July 18, 2015public class Matcher{
private Integer counter;
private boolean synchronized isValid(String symbol){
if(symbol.equals("(")){
counter++;
}else if(symbol.equals(")")){
counter--;
}
if(counter<0){
throws new Exception("paranthesis do not match") ;
}
}
}