JAVA学习第二周

DAY7 2021/12/16

charAt() 方法用于返回指定索引处的字符。索引范围为从 0 到 length() - 1。

public class Test {
    public static void main(String args[]) {
        String s = "www.runoob.com";
        char result = s.charAt(6);
        System.out.println(result);
    }
}

//结果输出n

public static boolean bracketMatching(String paraString) {
		stack temStack = new stack();
		char popchar;
		temStack.push('#');//注意在最下面加入#的位置，不能在每次循环都加入一次
		for(int i = 0;i < paraString.length();i++) {
			char charString = paraString.charAt(i);
			switch (charString) {
			case '<':
			case '[':
			case '{':
			case '(':
				temStack.push(charString);
				break;
			case '>':
				popchar = temStack.pop();
				if (popchar != '<') {
					return false;
				}
				break;
			case '}':
				popchar = temStack.pop();
				if (popchar != '{') {
					return false;
				}
				break;
			case ']':
				popchar = temStack.pop();
				if (popchar != '[') {
					return false;
				}
				break;
			case ')':
				popchar = temStack.pop();
				if (popchar != '(') {
					return false;
				}
				break;
			default:
				break;
			}
			
		}
		popchar = temStack.pop();
		if (popchar != '#') {
			return false;
		}
		return true;
	}