String数组初始化为构造函数的参数 [英] String array initialization as constructor parameter

问题描述

在Java中，这是完全合法的按以下方式初始化字符串数组：

 的String [] S = {FOO，BAR};
 

然而，试图实例化一个类，需要一个String数组作为参数，下面的一段code是不允许时：

 测试T =新的测试（{测试}）;
 

但是，这一次的作品：

 测试T =新的测试（新的String [] {测试}）;
 

有人能解释这是为什么？

解决方案

 的String [] S = {FOO，BAR};
 

这是允许在声明时仅

您不能

 的String [] S;
S = {FOO，BAR};
 

In Java, it is completely legal to initialize a String array in the following way:

String[] s = {"FOO", "BAR"};

However, when trying to instantiate a class that takes a String array as a parameter, the following piece of code is NOT allowed:

Test t = new Test({"test"});

But this works again:

Test t = new Test(new String[] {"test"});

Can someone explain why this is?

解决方案

String[] s = {"FOO", "BAR"};  

this is allowed at declaration time only

You can't

String[] s;
s={"FOO", "BAR"};  

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