java - Java，“找不到符号”是什么意思？

Question

我有一些java代码：

名称测试.java：

public class NameTest
{
    public static void main (String[] args)
    {
        Name = myName = new Name("John", "Smith", "Doe");  //This is Line 6
        Name = wifeName = new Name ("Jane", "Smith");
        Name = single = new Name ("Smith");
        Name someName;
        System.out.println ("myName: " + myName.toString());
    }
}

我得到的错误信息：

    *~/Java1/Section5$ java -cp. Name.java NameTest.java
Unrecognized option: -cp.
Could not create the Java virtual machine.
~/Java1/Section5$ javac NameTest.java
NameTest.java:6: cannot find symbol
symbol  : variable Name
location: class NameTest
        Name = myName = new Name("John", "Smith", "Doe");
        ^
NameTest.java:6: cannot find symbol

是什么NameTest.java:6: cannot find symbol意思？

Answer 1

你有一个语法错误

Name = myName = new Name("John", "Smith", "Doe");

应该

Name myName = new Name("John", "Smith", "Doe");

Answer 2

代替

Name = myName = new Name("John", "Smith", "Doe");

利用

Name  myName = new Name("John", "Smith", "Doe");

=是 java 中的赋值运算符，将 RHS 值分配给 LHS。

Answer 3

您不能使用此语法：

Name = single = new Name ("Smith");

反而，

Name single = new Name ("Smith");

修复所有这些将清除您当前的异常列表（一旦 myName 成为有效引用，最后一个将被修复）。