java - 当与 if 语句相同时给出 "Found one too many { characters without a } to match it"

Question

当运行以下代码时，它不会编译，并且收到一条错误消息，“发现一个太多的 { 字符，没有 } 与之匹配。”。

while (thePlayer.position.x > thePlayer.position2.x - 60) { 
              println("x2 =" + thePlayer.position2.x);
              thePlayer.position.x = thePlayer.position.x - 1;
              println("x =" + thePlayer.position.x);
            }
            else {
              thePlayer.position2.x = thePlayer.position.x;
              println("complete");
            }

但是，当我将其更改为下面的示例(if 语句)时，它可以正常编译并运行，唯一的更改是将“while”替换为“if”。

if (thePlayer.position.x > thePlayer.position2.x - 60) { 
              println("x2 =" + thePlayer.position2.x);
              thePlayer.position.x = thePlayer.position.x - 1;
              println("x =" + thePlayer.position.x);
            }
            else {
              thePlayer.position2.x = thePlayer.position.x;
              println("complete");
            }

我真的很困惑......

Answer 1

如果没有 if 语句，就不能有 else 语句。变化:

while (thePlayer.position.x > thePlayer.position2.x - 60) { 
              println("x2 =" + thePlayer.position2.x);
              thePlayer.position.x = thePlayer.position.x - 1;
              println("x =" + thePlayer.position.x);
            }
            else {
              thePlayer.position2.x = thePlayer.position.x;
              println("complete");
            }

至:

while (thePlayer.position.x > thePlayer.position2.x - 60) {
  println("x2 =" + thePlayer.position2.x);
  thePlayer.position.x = thePlayer.position.x - 1;
  println("x =" + thePlayer.position.x);
}

thePlayer.position2.x = thePlayer.position.x;
println("complete");

这将运行循环，当条件变为 false 时，它​​将运行 while 循环之后的行。