2.)Assume that an action listener has been added to button. Which method runs when the user clicks the button.

3.)Describe the roles and responsibilities of the model, view, and controller classes in a GUI program.

3.)What causes flicker? How can flicker be eliminated.

4.)How do the direction and velocity of an object determine where it will be placed after a given unit of time

2.)write a code segment that display your name and address in a message box, name an address should be formatted on separate lines by using the “\n” character.

3.)why we need to used the methods Integer.parseInt and Double.parseDouble when receiving numeric input from an I/O dialog box.

4.)give an example of a situation where you would want a panel to set its preferred size, rather than allow the size of the main window to determine that.

EX 9-2
1-a.)34
b.)4
c.)156
2.)The JVM checks the values of subscripts before using them and throws an ArrayIndexOutBoundsException if they are out of bound.

EX 9-3
1.)int i = 0 for (i==0, i=0; i –) System.out.print(a[i])
2.)int i = a.length – 1 for (i == a.length – 1; i>=0; i –) System.out.print(a[i])
3.)int index; for (int i =0; i < a. length; i ++){if (a[i] <0 ){index = i; break; } else {index = a.length;} System.out.print (index) ;
4-a.)It will change all the negative values of a to positive value by taking the absolute values of them.
b.)The loop will just get the sum of all elements of the a array.
5.)It tells the operator precisely how many elements inside the array.

EX 9-4
1-a.)double[] abc = new double[15]
b.)string[] abcd = new string[20]
2.)It is another way to initialize the array, it assign the exact values to the array’s element.
3-a.)int [] aaa = {100, 90, 75, 60, 88}
b.)double[] bbb = {0.12, 0.05, 0.15}
c.)string[] ccc = {nina, lu}
4.)

EX 9-5
1.)The programmer will try to solve the problem by tracking the array’s logical size with a separate integer variable.
2.)When the array is not full, it must replace the array;s physical length with its logical size in the loop.

EX 9-6
1.)A parallel array is situations in which it is convenient to declare.
2.)One array should contain the exponent and the other array should contain 2 raised to that power.
3.)String [] name = new String[50]int [] age = new int [50]int [] security = new int [50]String searchPerson;int correspondingAge = -1, correspondingSecurity = -1searchName = …for (int i = 0, i<name.length; i ++) if (searchName.equal (name[i]))correspondingAge = age [i]correpondingSecurity = security [i]break;}
4.)
5.)int[] exponent = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
int[] powers = new int[10];
for (int i = 0; int < 10; i++){
power [i] = math.pow(2, exponent[i])
} ;

EX 9-7
1.)An array in which each data item is accessed by specifying a pair of indices.
2.)If an application require the variable tale reference an array of four elements. Each of these elements in turn reference and array of five integers. And the application will need to use two dimensional arrays.
3.)
4.)

EX 7-3
1.)The role the menu plays is to display a list of options, after this, the user can select the one they needs.
2.)The menu-driven programs prompts fro additional inputs related to that option and performs the needed computations, after which it displays the menu again.

EX 7-4
1-a.)%11s
b.)%12s
c.)%-15
d.)System.out.printf(”%6o”, i)
e.)System.out.printf(%10.2f)
2-a.)10,000.50
b.)45 632
c.)34.54

EX 7-5
1.)The program will halt and give an error message.
2.)The programmer embeds the call to an input method in a try-catch statement, as its name implies, this statement consists of two parts. The statement within the try clause are executed until one of them throws an exception. If that happens, an exception object is created and sent immediately to the catch clause. The code within the catch clause is then executed. Alternatively, if no statement throws an exception within the try clause, the catch clause is skipped.