import java.util.*;
public class BasicContainer
{
public static void main(String args[])
{
Collection c=new HashSet();
c.add("hello");
c.add(new Name("fi","li"));
c.add(new Integer(100));
System.out.println(c);c.remove("hello");
c.remove(new Integer(100));
System.out.println(c.remove(new Name("fi","li")));
System.out.println(c);}
}
class Name
{
private String firstName,lastName;
public Name(String firstName,String lastName)
{
this.firstName=firstName;
this.lastName=lastName;
}
public String getFirstName()
{return firstName;}
public String getLastName()
{return lastName;}
public String toString()
{return firstName+" "+lastName;}
/*public boolean equals(Object obj)
{
if(obj instanceof Name)
{
Name name=(Name) obj;
return (firstName.equals(name.firstName))&&(lastName.equals(name.lastName));
}
return super.equals(obj);
}
public int hashCode()
{
return firstName.hashCode();
}*/
}
请问注释掉的一部分是怎么被调用的,因为在程序中找不到对他们的引用(调用)然而注释掉以前跟注释掉以后却不一样呢?
谢谢!
重写之后,他会调用你重写后的方法
lz注释的部分是重写了Object的equals和hashcode方法。当然对于hash存储的结构就会有作用。