无法使用add()添加jvmArgs，为什么? [英] Can't add jvmArgs using add(), why?

问题描述

谁能解释为什么第一个样本起作用而第二个样本却什么也没做?

Can anyone explain why the first sample working while the second does nothing?

test {
    jvmArgs '-Xdebug',
            '-Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=4000'
}

test {
    jvmArgs.add('-Xdebug')
    jvmArgs.add('-Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=4000')
}

推荐答案

因为在第二个示例中

Because in the second example this method is invoked. You get the list, modify it but the changes are not reflected to settings - read only access. In the first example this method is invoked and arguments passed are set.

以下是说明，将返回列表的副本(出于安全性，安全性的考虑，可变类型应始终作为副本返回)

Here's the explanation, a copy of the list is returned (it's for safety, security reasons - mutable types should be always returned as a copy)

public List<String> getJvmArgs() {
   List<String> args = new ArrayList<String>();
   for (Object extraJvmArg : extraJvmArgs) {
      args.add(extraJvmArg.toString());
   }
   return args;
}

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