sonar扫描代码报错Do something with the "boolean" value returned by "setWritable".

使用sonar扫描代码 报错Do something with the "boolean" value returned by "setWritable".

```java
 public static void fileUnModified(File file){
        if (file!=null){
            file.setWritable(false);
            file.setExecutable(false);
            file.setReadOnly();
        }
    }

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