小编Pra*_*V S的帖子

public class OverLoad {

    void method(Integer i){
        System.out.println("Integer "+i);
    }
    void method(int i){
        System.out.println("in "+i);
    }
    public static void main(String a[]){
        OverLoad m= new OverLoad();
        m.method(2); //it calls method(int i) why?    
    }
}

如果我调用m.method(3)它会调用int方法为什么？如果我调用m.method((Integer)3)那么它将调用Integer方法.

默认情况下,它将进入原始数据类型

org.apache.cxf.jaxrs.ext.multipart.Attachment attachments=null;

List<Attachment> clone = new ArrayList<Attachment>(attachments.size());
for(Object item: attachments) 
clone.add((Attachment)item.clone());//The method clone() from the type Object is not visible

我想克隆该List<Attachment> clone对象,但它说来自Object类型的方法clone()是不可见的