The method or(capture#2-of ?) in the type Optional is not applicable for the arguments (Object)
而它在运行时成功编译mvn compile.
该课程如下:
package testit;
import java.util.Map;
import java.util.Map.Entry;
import com.google.common.base.Optional;
public class Test {
private static final Object NO_VALUE = new Object();
public void method(Map map) {
for (Entry entry : map.entrySet()) {
Optional.fromNullable(entry.getValue()).or(NO_VALUE);
// ^^ error here
}
}
}
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