下面这个小程序打印出的为什么是true和false啊，求大神分析一下，万分感谢~

public class BasicContainer {
public static void main(String[] args) {
Collection c = new HashSet();
c.add("hello");
c.add(new Name("lu","dongdong"));
c.add(new Integer(100));
System.out.println(c.remove(new Integer(100)));
System.out.println(c.remove(new Name("lu","dongdong")));
}
}

class Name {
private String firstName,lastName;
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;
}
}

打印出的就是：
true
false