堆叠顺序 和 推断是否成对括号

public class SqStack {

	public int[] data;
	public int top;
	public SqStack() {
		data = new int[20];
		top = -1;
	}
	public boolean empty() {
		return top == -1;
		
	}
	public boolean push(int e) {
		if(top == 19) {
			return false;
		}
		top++;
		data[top] = e;
		return true;
	}
	public int[] pop() {
		int[] arr = new int[2];
		if(top == -1) {
			arr[0] = 0;
			return arr;
		}
		arr[0] = 1;
		arr[1] = data[top--];
		return arr;
	}
	public int[] top() {
		int[] arr = new int[2];
		if(top == -1) {
			arr[0] = 0;
			return arr;
		}
		arr[0] = 1;
		arr[1] = data[top];
		return arr;
	}
	public void display() {
		for(int i=0; i<=top; i++) {
			System.out.print(data[i]+ " ");
		}
		System.out.println();
	}
	
	public static void main(String[] args) {
		SqStack ss = new SqStack();
		System.out.println(ss.empty());
		ss.push(2);
		ss.push(3);
		ss.display();
		ss.pop();
		ss.display();
		ss.push(1);
		ss.push(2);
		ss.display();
		ss.pop();
		ss.push(4);
		ss.display();
		ss.top();
		ss.display();

	}

}

结果：

true
2 3 
2 
2 1 2 
2 1 4 
2 1 4 

public class SqStack {

	public int[] data;
	public int top;
	public SqStack() {
		data = new int[20];
		top = -1;
	}
	public boolean empty() {
		return top == -1;
		
	}
	public boolean push(int e) {
		if(top == 19) {
			return false;
		}
		top++;
		data[top] = e;
		return true;
	}
	public int[] pop() {
		int[] arr = new int[2];
		if(top == -1) {
			arr[0] = 0;
			return arr;
		}
		arr[0] = 1;
		arr[1] = data[top--];
		return arr;
	}
	public int[] top() {
		int[] arr = new int[2];
		if(top == -1) {
			arr[0] = 0;
			return arr;
		}
		arr[0] = 1;
		arr[1] = data[top];
		return arr;
	}
	public void display() {
		for(int i=0; i<=top; i++) {
			System.out.print(data[i]+ " ");
		}
		System.out.println();
	}
	
	//检查括号是否配对
	public boolean check(String s) {
		for(int i=0; i<s.length(); i++) {
			if(s.charAt(i) == '(') {
				push(1);
			} else if(s.charAt(i) == ')') {
				if(empty()) 
					return false;
				else 
					pop();
			}
		}
		if(empty()) {
			return true;
		} else {
			return false;
		}
	}
	public static void main(String[] args) {
		SqStack ss = new SqStack();
		String s = new String("(sd()f(() )d()j)");
		System.out.println(ss.check(s));
		s = new String("(sd()f(() ))d()j)");
		System.out.println(ss.check(s));
		s = new String("(sd()f((() )d()j)");
		System.out.println(ss.check(s));

	}

}

结果：

true
false
false

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