— Scott McNealy, Sun Microsystems Chairman, President and ceo

What did Jai suspect?
Will he get out of Leveler’s skimmer with all his bones intact?
Five-Minute
Mystery
puzzle: 
Five Minute Mystery

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4
methods 
use 
instance variables
93
A class can have any number of these.
A method can have only one of these.
This can be implicitly promoted.
I prefer my instance variables private.
It really means ‘make a copy’.
Only setters should update these.
A method can have many of these.
I return something by definition.
I shouldn’t be used with instance variables
I can have many arguments.
By definition, I take one argument.
These help create encapsulation.
I always fly solo.
instance variables, getter, setter,method
return
return, argument
encapsulation
pass by value
instance variables
argument
getter
public
method
setter
getter, setter, public, private
return
A
Class ‘XCopy’ compiles and runs as it stands ! The 
output is: ‘42 84’. Remember Java is pass by value, (which 
means pass by copy), the variable ‘orig’ is not changed by the 
go( ) method.
B
class Clock {
String time;
void setTime(String t) {
time = t;
}
String
getTime() {
return time;
}
}
class ClockTestDrive {
public static void main(String [] args) {
Clock c = new Clock();
c.setTime(“1245”);
String tod = c.getTime();
System.out.println(“time: “ + tod);
}
}
Note: ‘Getter’ methods have a return
type by definition. 
Exercise Solutions

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