Question

Java：为什么我加了@SuppressWarnings({"unused","rawtypes"}) 还是会报警告呢？

package test.ant;
import java.util.ArrayList;
import java.util.List;

@SuppressWarnings({"unused","rawtypes"})
public class SuppressWarningsTest
{
public static void main(String[] args)
{
List<String> list = new ArrayList();
}
}

list变量没有使用，ArrayList没有指定泛型，这两个警告我都给@SuppressWarnings({"unused","rawtypes"}) 了，为什么还是会报Type safety：The expression of type ArrayList needs unchecked conversion to conform to List<String>

@SuppressWarnings({"unchecked"})是专门用来屏蔽那种警告的呢？

Answer 1

@SuppressWarnings("all")压制所有警告不就好了

Answer 2

new ArrayList<String>(); 因为你的声明没加泛型所以报错，这个是语法错误，不在屏蔽范围的

Answer 3

List<String> list = new ArrayList<>();