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CHAPTER 4 Control Structures
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Let s see how this works in the next example The switch value is 80 Java will compare the switch value to each of the case constants, beginning with the first case statement There isn t a match until the third case statement Java then executes the Systemoutprintln() statement that displays 80 on the screen Once 80 is displayed, Java executes the break statement, which causes Java to exit the switch statement
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class Demo { public static void main (String args[]) { switch (80) { case 100: Systemoutprintln("100"); break; case 90: Systemoutprintln("90"); break; case 80: Systemoutprintln("80"); break; } } }
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The next example is a modification of the previous one The switch value is changed to 90 and the break statement is removed from the case statement whose constant is 90 Java behaves differently in this example than it does in the previous example Here s what is happening: Java compares the switch value to the first case constant, as was done in the previous example Because the first case constant isn t a match, Java compares the second case constant, where there is a match Java proceeds to execute the statement beneath this case constant, which displays 90 on the screen Afterward, Java moves to the next statement Notice that the next statement is another case statement and not a break statement A break statement tells Java to break out of the switch statement Because there isn t a break statement, Java continues by comparing the switch value to the next case constant
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class Demo { public static void main (String args[]) { switch (90) { case 100: Systemoutprintln("100"); break; case 90:
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Systemoutprintln("90"); case 80: Systemoutprintln("80"); break; } } }
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Previously in this chapter, you learned that an else clause is used in an if statement to define statements that will execute if the condition in the if statement isn t true The switch statement has a similar feature called a default statement The default statement is written similar to a case statement, and it s placed after the last case statement The default statement doesn t have a constant or a break statement because it is the last statement within the switch statement However, the default statement has other statements beneath it that are executed when Java reaches the default statement The following example illustrates how to use a default statement in your program This example tells Java to examine the constant for each case statement, looking for a match for the switch value, which is 70 Because none match, Java executes the statement beneath the default statement, which displays a message on the screen
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class Demo { public static void main (String args[]) { switch (70) { case 100: Systemoutprintln("100"); break; case 90: Systemoutprintln("90"); break; case 80: Systemoutprintln("80"); break; default: Systemoutprintln("No match"); } } }
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Something very interesting happens to the default statement when the break statement isn t used in a case statement whose constant matches the switch value Java executes statements beneath the default statement if the break statement is excluded from a matching case statement
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CHAPTER 4 Control Structures
Let s see how this works in the next example Java is told to look at the case constants and find a match to the switch value, which is 80 When a match is found, Java displays 80 on the screen However, notice that the matching case statement doesn t have a break statement This means that Java continues to the next line of the program below the statement that displays 80, which contains the default statement When Java encounters a default statement, it always runs the statements contained within the default statement Therefore, No match is also displayed on the screen
class Demo { public static void main (String args[]) { switch (80) { case 100: Systemoutprintln("100"); break; case 90: Systemoutprintln("90"); break; case 80: Systemoutprintln("80"); default: Systemoutprintln("No match"); } } }
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