EX $3\mathrm{.}1$ Write a statement that prints the number of characters in a String object called overview $.$

EX $3\mathrm{.}2$ Write a statement that prints the $8$th character of a String object called introduction $.$

EX $3\mathrm{.}3$ Declare a String variable named str and initialize it to contain the same characters as a String object called name $,$ except in all uppercase characters.

EX $3\mathrm{.}4$ Write a declaration for a String variable called change and initialize it to the characters stored in another String object called original with all $\text{'}$e$\text{'}$ characters changed to $\text{'}$j$\text{'}.$

EX $3\mathrm{.}5$ What output is produced by the following code fragment? String m$1,$ m$2,$ m$3$; m$1=$ "Quest for the Holy Grail"; m$2=$ m$1.$toLowerCase$()$; m$3=$ m$1+""+$ m$2$; System.out.println$($m$3.$replace$(\text{'}$g$\text{'},\text{'}$z$\text{'}))$;

EX $3\mathrm{.}6$ What is the effect of the following import statement? import java.awt.$*$;

EX $3\mathrm{.}7$ Assuming that a Random object has been created called generator $,$ what is the range of the result of each of the $-$ following expressions?

a$.$ generator.nextInt$(20)$

b$.$ generator.nextInt$(8)+1$

c$.$ generator.nextInt$(12)+2$

d$.$ generator.nextInt$(35)+10$

e$.$ generator.nextInt$(100)-50$

EX $3\mathrm{.}9$ Write an assignment statement that computes the square root of the sum of num$1$ and num$2$ and assigns the result to num$3.$

EX $3\mathrm{.}10$ Write a single statement that computes and prints the absolute value of total.

EX $3\mathrm{.}11$ Write code statements to create a DecimalFormat object that will round a formatted value to four decimal places. Then write a statement that uses that object to print the value of result $,$ properly formatted.

EX $3\mathrm{.}12$ Write code statements that prompt for and read a double value from the user, and then print the result of raising that value to the fourth power. Output the results to three decimal places.

EX $3\mathrm{.}13$ Write a declaration for an enumerated type that represents the days of the week.

EX $3\mathrm{.}14$ Compare and contrast a traditional coordinate system and the coordinate system used by Java graphical components.

EX $3\mathrm{.}15$ Write a declaration for each of the following:

a$.$ A line that extends from point $(60,100)$ to point $(30,90).$

b$.$ A rectangle that is $20$ pixels wide, $100$ pixels high, and has its upper$-$left corner at point $(10,10).$

c$.$ A circle that is centered at point $(50,75)$ and has a radius of $30.$

d$.$ An ellipse that is centered at point $(150,180)$ and is $100$ pixels wide and $80$ pixels high.

EX $3\mathrm{.}16$ Are the following lines horizontal, vertical, or neither?

a$.$ new Line$(30,90,30,10)$

b$.$ new Line$(85,70,70,85)$

c$.$ new Line$(20,40,150,40)$

EX $3\mathrm{.}17$ Is each of the following ellipses wider than it is tall or taller than it is wide?

a$.$ new Ellipse$(300,100,50,10)$

b$.$ new Ellipse$(100,200,20,40)$

c$.$ new Ellipse$(150,220,60,30)$