java - for循环上的错误-尝试使用循环来计算字母的重复

Question

在for循环上，我有Java applet向我显示我有一个错误。我正在尝试使用for循环来计算字母的重复。

String countString = "";
for (int i = 0; i < 26; i++){
// at the line below, my java applet says I have an error, and that the 
//"letterCounts" should be a int and not a string, but I need it to be a string
     String n = letterCounts[i];
     if (n.equals("0")) {
          countString = countString + "   ";
     } else if (n.length() == 1) {
          countString = countString + " " + n + " ";
     } else {
          countString = countString + n + " ";
     }
} 
this.countLabel.setText(countString);

Answer 1

您没有显示letterCounts的定义，但我敢打赌它是int[] letterCounts。

因此，由于letterCounts是int的数组，您不能仅将其分配给String。

只需将String n更改为int n，然后将其与n == 0的比较就可以了。见下文:

    String countString = "";

    for (int i = 0; i < 26; i++)
    {
      int n = letterCounts[i];

      if (n == 0) {
        countString = countString + "   ";
      } else if (n < 10) {
        countString = countString + " " + n + " ";
      } else {
        countString = countString + n + " ";
      }
    } 

    this.countLabel.setText(countString);