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Logical operators have Boolean operands and return a Boolean result Logical operators allow you to combine multiple Boolean expressions to form other Boolean expressions The logical operators are ||, &&, and ^, corresponding to OR, AND, and exclusive OR, respectively

[132]

setImage(Image)

- Sets the receiver's image to the argument,

OR Operator (||)

setSelection(boolean)

[133]

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In Listing 331, if the user enters quit or presses the Enter key without typing in a value, it is assumed that she wants to exit the program To enable two ways for the user to resign, you use the logical OR operator, || The || operator evaluates two Boolean expressions and returns a TRue value if either one of them is true (see Listing 332)

- Sets the selection state of the receiver,

setText(String)

[134]

if((hourOfTheDay > 23) || (hourOfTheDay < 0)) SystemConsoleWriteLine("The time you entered is invalid");

Useful creation styles include:

- Creates upward pointing arrow button - Creates downward pointing arrow button - Creates leftward pointing arrow button or left-

[135]

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Note that with the Boolean OR operator, it is not necessary to evaluate both sides of the expression The OR operators go from left to right, so if the left portion of the expression evaluates to true, then the right portion is ignored Therefore, if hourOfTheDay has the value 33, (hourOfTheDay > 23) will return TRue and the OR operator ignores the second half of the expression Short-circuiting an expression also occurs with the Boolean AND operator

- Creates rightward pointing arrow button or right-

The following example (shown without import or package statements) creates a window with a single push button Clicking on the push button will change the text of the button (see Figure 4-5)

And Operator (&&)

[136] [137]

Figure 4-5

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The Boolean And operator, &&, evaluates to true only if both operands evaluate to TRue If either operand is false, the combined expression will return false Listing 333 displays that it is time for work as long as the current hour is both greater than 10 and less that 24 [2] As you saw with the OR operator, the AND operator will not always evaluate the right side of the expression If the left operand returns false, then the overall result will be false regardless of the right operand, so the runtime ignores the right operand

orgeclipseswt*; orgeclipseswtevents*; orgeclipseswtlayout*; orgeclipseswtwidgets*;

[138]

public class ButtonExample { public static void main(String[] args) { Display display = new Display(); Shell shell = new Shell(display); shellsetText("Button Example"); shellsetBounds(100, 100, 200, 100); shellsetLayout(new FillLayout()); final Button button = new Button(shell, SWTPUSH); buttonsetText("Click Me Now"); buttonaddSelectionListener(new SelectionAdapter() { public void widgetSelected(SelectionEvent event) {

if ((hourOfTheDay > 10) && (hourOfTheDay < 24)) SystemConsoleWriteLine( "Hi-Ho, Hi-Ho, it's off to work we go");

buttonsetText("I Was Clicked"); } }); shellopen(); while (!shellisDisposed()) { if (!displayreadAndDispatch()) displaysleep(); } displaydispose(); } }

[139]

Relative to the first example in this chapter, the interesting lines in the above example are highlighted in bold After the creation of the button, a selection listener is added in which a SelectionAdapter is created that overrides the widgetSelected() method

Exclusive OR Operator (^)

Text widgets provide text viewing and editing capabilities If the user types more text than can be accommodated within the widget, it will automatically scroll Useful APIs include:

[140]

addModifyListener(ModifyListener)

The caret symbol, ^, is the "exclusive OR" (XOR) operator When applied to two Boolean operands, the XOR operator returns true only if exactly one of the operands is true, as shown in Table 33

collection of listeners who will be notified when the receiver's text is modified, by sending it one of the messages

[141]

Left Operand True True False False Right Operand True False True False Result False True True False

addSelectionListener(SelectionListener) -

the collection of listeners who will be notified when the control is selected, by sending it one of the messages defined in the SelectionListener interface

Unlike the Boolean AND and Boolean OR operators, the Boolean XOR operator does not short-circuit: It always checks both operands, because the result cannot be determined unless the values of both operands are known

[142]

addVerifyListener(VerifyListener)

collection of listeners who will be notified when the receiver's text is verified, by sending it one of the messages defined in the VerifyListener interface

Logical Negation Operator (!)

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