【小王Java自习】

堆栈

class MyStack{public static Stack<Character> st = new Stack<Character>();public void pushC(char c) {st.push(c);}public char popC() {char ret = st.pop();return ret;}}

队列

    class MyQueue{public static Queue<Character> que = new LinkedList<>();public void enqueueC(char c) {que.offer(c);}public char dequeueC() {char ret = que.poll();return ret;}}

非数字抛出例外

try {int tmp = Integer.parseInt(S);System.out.println(tmp);} catch (NumberFormatException ex){System.out.println("Bad Data");}

非法参数例外-自定义抛出信息

throw new IllegalArgumentException("n and p should be non-negative");