Java "The label Label244 is missing"错误

Question

我在错误列表中看到此错误，但似乎无法找到解决方法。我尝试的一切似乎都没有效果。

  if (this.mouseX >= 522 + paddingX + (clientSize >= 1 ? 3 - (this.longTabs ? 240 : 0) : 0)) {
    if (this.mouseX <= 762 + paddingX + (clientSize >= 1 ? 3 - (this.longTabs ? 240 : 0) : 0)) {
      if (this.mouseY >= '©' + (clientSize >= 1 ? 261 + (this.longTabs ? 37 : 0) : 0) + paddingY) {
        if (this.mouseY < '�' + (clientSize >= 1 ? 261 + (this.longTabs ? 37 : 0) : 0) + paddingY) {
          break label244; } //Where the error is
        }
      }
    }
  }

但是这里设置了label244:

        {
          int i;
          label244: i = 0;
          for (int x = 0; i < 8; x += 30)
          {

能否通过一些示例告诉我如何解决这些问题？我还剩下 17 个这样的错误。

Answer 1

来自Java Language Specification #14.7 (强调我的)

[...] Java programming language has no goto statement; identifier statement labels are used with break (§14.15) or continue (§14.16) statements appearing anywhere within the labeled statement.

The scope of a label of a labeled statement is the immediately contained Statement.

这意味着标签

label244: i = 0;

仅影响i=0。换句话说，它类似于

label244: {
    //here you can use label
    i = 0;
}
//but here label is no longer accessible.

因此在此范围之外它不可见/不可访问。

如果您想在 for 范围内使用它，请将其放在它之前(将其移到 i = 0; 之后)。

int i;
i = 0;
label244: 
for (int x = 0; i < 8; x += 30)
{
    //...
}