Java7 Diamond运算符转换编译错误

Question

I wanted to convert the current code to Java7 diamond operator . I have the below regular expression for finding and replace.

Finding

new (\w+)<.+>

Replace:

new $1<> 

The problem is it is getting replaced for anonymous classes as well. Becuase of this I get compilation error. So How do I write the regular expression which avoid inner classes?

Answer 1

Try this : (?s)new (\\w+)<.+>(\\(.*?\\);)

String test = "List<String> t = new ArrayList<String>();";
System.out.println(test.replaceAll("(?s)new (\\w+)<.+>(\\(.*?\\);)", "new $1<>$2"));

String test2 = "List<String> t = new ArrayList<String>(getList());";
System.out.println(test2.replaceAll("(?s)new (\\w+)<.+>(\\(.*?\\);)", "new $1<>$2"));

String test3 = "List<String> t = new ArrayList<String>(\n\tgetList(\n\t\tanotherMethod()\n\t)\n);";
System.out.println(test3.replaceAll("(?s)new (\\w+)<.+>(\\(.*?\\);)", "new $1<>$2"));

String test4 = "List<String> t = new List<String>(){ /* implementation */ };";
System.out.println(test4.replaceAll("(?s)new (\\w+)<.+>(\\(.*?\\);)", "new $1<>$2"));

String test5 = "List<String> t = new List<String>()\n{\n\t/* implementation */\n};";
System.out.println(test5.replaceAll("(?s)new (\\w+)<.+>(\\(.*?\\);)", "new $1<>$2"));

It prints :

List<String> t = new ArrayList<>();
List<String> t = new ArrayList<>(getList());
List<String> t = new ArrayList<>(
    getList(
        anotherMethod()
    )
);
List<String> t = new List<String>(){ /* implementation */ };
List<String> t = new List<String>()
{
    /* implementation */
};