此Java String数组声明有什么问题

我用三种不同的方式在Java中声明字符串数组。一种始终有效，而另两种仅根据其写入顺序起作用。

在第一个版本中，method2不起作用，但method3起作用。

public class weirdStringArray {

    String [] method1 = new String [] {"one","two","three"}; //<------ Works no matter where it's placed

    String [] method2;       //<------ "Syntax error on token ";", { expected after this token"
    method2 = new String[3]; //  Doesn't work in this postion
    method2[0] = "one";
    method2[1] = "two";
    method2[2] = "three";

    String [] method3 = new String[3]; //<-------  No issue, works fine in this position
    method3[0] = "one";                
    method3[1] = "two";
    method3[2] = "three";
} // <----- Syntax error, insert "}" to complete ClassBody (but it does seem to complete ClassBody...?)

但是，开关位置和工作声明也会互换。看，现在method2可以使用，但method3不能。

public class weirdStringArray {

    String [] method1 = new String [] {"one","two","three"};

    String [] method3 = new String[3]; //<------ "Syntax error on token ";", { expected after this token"
    method3[0] = "one";               //  Doesn't work in this postion
    method3[1] = "two";
    method3[2] = "three";

    String [] method2; //<---------- Put it in a different place and it works
    method2 = new String[3]; 
    method2[0] = "one";
    method2[1] = "two";
    method2[2] = "three";

} // <----- Syntax error, insert "}" to complete ClassBody (but it does seem to complete ClassBody...?)

这里可能会发生什么？为什么顺序会有所不同？位置2发生了什么？顺便说一句，如果我删除第一个工作表格，这没有什么区别：

public class weirdStringArray {

    //String [] method1 = new String [] {"one","two","three"};

    String [] method2;        //<------ "Syntax error on token ";", { expected after this token"
    method2 = new String[3]; //  Doesn't work in this postion 
    method2[0] = "one";
    method2[1] = "two";
    method2[2] = "three";

    String [] method3 = new String[3]; //<-------  No issue, works fine in this position
    method3[0] = "one";               
    method3[1] = "two";
    method3[2] = "three";

} // <----- Syntax error, insert "}" to complete ClassBody (but it does seem to complete ClassBody...?)

问题来源：Stack Overflow