Java Data Type - 如何将字符串转换为整数

class Main {
  public static void main(String[] args) {
    int x, y;

    x = Integer.parseInt("1");
    y = Integer.parseInt("2");

    if (x > y) {
      System.out.println(x + " + y);
    } else if (x < y) {
      System.out.println(x + "<" + y);
    } else {
      System.out.println(x + "=" + y);
    }
  }
}