Retrieve a pair of parenthesis with recursion.

AaaParenthesisRecursion

package javaapplication1.beginer;

/**
 *
 * @author naoki
 */
public class AaaParenthesisRecursion {
    public static void main(String[] args) {
        String aaa = "aaa(aaa(aa((aaa)aa))aa)a";
        for(int i = 0; i < aaa.length(); ++i){
            char ch = aaa.charAt(i);
            switch(ch){
                case 'a':
                    break; // do nothing
                case ')':
                    System.out.println(")が多すぎます" + i);
                    return;
                case '(':
                    i = inParenthesis(aaa, i);
                    break;
            }
        }
    }

    private static int inParenthesis(String aaa, int start) {
        for(int i = start + 1; i < aaa.length(); ++i){
            char ch = aaa.charAt(i);
            switch(ch){
                case 'a':
                    break; // do nothing
                case ')':
                    System.out.printf("%dと%dが対応%n", start, i);
                    return i;
                case '(':
                    i = inParenthesis(aaa, i);
                    break;
            }
        }
        System.out.println("(が多すぎます" + start);
        return aaa.length();
    }
}