백준 10828 자바

https://www.acmicpc.net/problem/10828

10828번: 스택

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;


public class baekjoon_10828_01 {
	
	public static void main(String[] args) throws NumberFormatException, IOException {
		
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		int TC = Integer.parseInt(br.readLine());
		
		int[] stack = new int[TC];
		int size = 0; 
		
		for(int tc = 0; tc < TC ; tc ++) {
			
			String[] temp = br.readLine().split(" ");
			
			String command = temp[0];			
			if(command.equals("push")) {
				int data = Integer.parseInt(temp[1]);
				stack[size] = data;
				size += 1;
			}else if(command.equals("pop")) {
				
				if(size == 0) {
					System.out.println("-1");
				}else {
					System.out.println(stack[size-1]);
					size -= 1;
				}
				
			}else if(command.equals("size")) {
				System.out.println(size);
			}else if(command.equals("empty")) {
				if(size == 0) {
					System.out.println("1");
				}else {
					System.out.println("0");
				}
				
			}else if(command.equals("top")) {
				if(size == 0) {
					System.out.println("-1");
				}else {
					System.out.println(stack[size-1]);
				}
			}
			
		}
	}
	

}