Thread: throwing Exception

Hi guys.
I have two simple question for you, this is about programmer defined exception. (this source code come from thomas wu book, OOP introduction),

firstly,
is it okay for not write throws IllegalArgumentException in methode setPassword, as I know this methode throw exception?
problem.jpg

secondly,
I have programmer defined Exception here, and in the AgeInputException Constactore there's no throws IllegalArgumentException.
is it okay?
ask.jpg

haha, sorry Norm, I'm new here..

Here there are

I wonder In this defined Exception constructor, there's no throws IllegalArgumentException on the header of class,
you can see that that constructor throwing an exception.

/*
Chapter 8 Sample Class: Customized Exception Class
File: AgeInputException.java
*/
class AgeInputException extends Exception {
private static final String DEFAULT_MESSAGE = "Input out of bounds";
private int lowerBound;
private int upperBound;
private int value;
public AgeInputException(int low, int high, int input) {
this(DEFAULT_MESSAGE, low, high, input);
}
public AgeInputException(String msg,  //<=== there's no throws IllegalArgument Exception here
int low, int high, int input) {
super(msg);
if (low > high) {
throw new IllegalArgumentException();
}
lowerBound = low;
upperBound = high;
value = input;
}

in this code too, in the setPassword methode there's no throws IllegalArgumentException too

import java.io.*;
class Resident implements Serializable {
private String name;
private String room;
private String password;
public Resident( ) {
this("unassigned", "000", "XY12#$ab");
}
public Resident(String name, String room, String pwd)
throws IllegalArgumentException {
setName(name);
setRoom(room);
setPassword(pwd);
}
public String getName( ) {
return name;
}
public String getPassword( ) {
return password;
}
public String getRoom( ) {
return room;
}
public void setName(String name) {
this.name = name;
}
public void setPassword(String pwd) {
int length = pwd.length();
if (length < 8) {
throw new IllegalArgumentException();
} else {
this.password = pwd;
}
}
public void setRoom(String room) {
this.room = room;
}
}

so what do you think?

thanks for your advice btw