Question

以下代码的输出为320。

pdf[pdf.a>2]

有人可以向我解释一下吗？先感谢您。它在什么基础上给予320。据我所知，它应该抛出异常。但是我要320。

Answer 1

所有字符都有数字值，因此可以进行数学运算。

以下内容：

      for (char c : "abcdefghijkln".toCharArray()) {
         System.out.println("c = " + c + ", c has value of " + (int) c
               + ", c * 10 = " + (c * 10));

      }

产生以下输出。

c = a, c has value of 97, c * 10 = 970
c = b, c has value of 98, c * 10 = 980
c = c, c has value of 99, c * 10 = 990
c = d, c has value of 100, c * 10 = 1000
c = e, c has value of 101, c * 10 = 1010
c = f, c has value of 102, c * 10 = 1020
c = g, c has value of 103, c * 10 = 1030
c = h, c has value of 104, c * 10 = 1040
c = i, c has value of 105, c * 10 = 1050
c = j, c has value of 106, c * 10 = 1060
c = k, c has value of 107, c * 10 = 1070
c = l, c has value of 108, c * 10 = 1080
c = n, c has value of 110, c * 10 = 1100

Char在Java中与整数相乘

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