括号匹配问题

括号匹配问题：

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import java.util.Stack;public class SymbolMatch {public boolean check(String str) {Stack<Character> s = new Stack<Character>();boolean match = true;for (int i = 0; i < str.length() && match; i++) {try {switch (str.charAt(i)) {case '(' : case '[' :case '{' : s.push(str.charAt(i)); break;case ')' : if (s.pop() != '(') match = false; break;case ']' : if (s.pop() != '[') match = false; break;case '}' : if (s.pop() != '{') match = false; break;}} catch (Exception e) {match = false;}}if (match && !s.isEmpty())match = false;return match;}public static void main(String[] args) {SymbolMatch sm = new SymbolMatch();System.out.println("(: " + sm.check("("));System.out.println("a(bc[d])e{fd}: " + sm.check("a(bc[d])e{fd}"));System.out.println("a(bc]d: " + sm.check("a(bc]d"));System.out.println("a(b(c)d: " + sm.check("a(b(c)d"));System.out.println("a(b)c)d: " + sm.check("a(b)c)d"));}}