Java 数据类型问题

Question

public class Main {

  public static void main(String[] args) {
    int j = + -1234;
    System.out.printf("%d", j);
    System.out.println();
    System.out.println(j);
  }
}

结果是 -1234。任何人都可以解释为什么结果是 -1234 吗？

Answer 1

赋值int j = + -1234;相当于:

j = (1) * (-1) * 1234 (a)

现在:

-1 = (1) * (-1) (b)

将b代入a得到:

j= -1 * 1234

所以 j = -1234

在赋值方程中the + and - are acting as unary oprators