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Nested switch Statements
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As with if statements, you can also nest switch statements A nested switch statement is a switch statement that is placed within a case statement or default statement of another switch statement The purpose for nesting a switch statement is to tell Java to make another decision after making the first decision The next example shows how to nest a switch statement The nested switch statement appears in the case 90 statement Java begins by comparing the switch value to each case constant Only one case statement matches the switch value Java then compares the second switch value, which is the character B, to a second set of case statements You can include as many case statements as needed by your program in the nested switch statement Likewise, you can also include a default statement
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class Demo { public static void main (String args[]) { char a = 'B';
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switch (90) { case 100: Systemoutprintln("100"); break; case 90: switch (a){ case 'a': Systemoutprintln("A"); break; case 'b': Systemoutprintln("B"); break; } break; case 80: Systemoutprintln("80"); break; default: Systemoutprintln("No match"); } } }
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An iteration statement is what programmers call a loop It causes Java to continue to execute one or more statements as long as a condition exists Think of an iteration statement as being a drill instructor who tells you to continue to do push-ups until you re told to stop Java has three kinds of iteration statements: the for loop, the while loop, and the dowhile loop
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The for loop tells Java to executes one or more statements contained in the for loop as long as a specified condition is true The condition is specified in a control expression, which is a relational expression that evaluates to either a Boolean true or a Boolean false If the control expression is false, Java moves to the statement that follows the for loop in the program If the control expression is true, Java enters the for loop and
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CHAPTER 4 Control Structures
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executes statements contained in the for loop After the last statement within the loop is executed, Java once again evaluates the control expression to determine whether it should enter the loop for another iteration The for loop has three expressions that are contained within parentheses and separated with a semicolon Each expression is optional However, the parentheses and the semicolon are required You ll be including all three expressions in most of your programs The first expression is called the initialization expression and is used to declare and initialize a control variable that is typically used in the conditional expression This is the first expression within the for loop that is evaluated by Java Technically, the initialization expression and the control variable don t have to be used in the conditional expression, but for our examples they will be used this way The second expression is the conditional expression This is the second expression in the for loop that is evaluated by Java The conditional expression sets the threshold for when Java enters the for loop You can use any relational expression and compound relational expressions that are linked together using a logical operator as the conditional expression for the for loop The third expression is the iteration expression, and it s the first expression evaluated by Java after executing statements within the loop The iteration expression changes the value of the control variable Typically, the change involves incrementing or decrementing the control variable The next example illustrates how to write a for loop in your Java program Here s what Java is being told to do: The first time it encounters the for loop, Java evaluates the first expression This expression declares the variable x and then initializes it to zero Variable x is used as the control variable A control variable is a variable whose value is used in the conditional expression to help control the number of iterations that Java executes in the for loop Next, Java evaluates the second expression, which is the conditional expression that determines whether Java should enter the for loop The conditional expression tells Java to determine whether the value of x is less than 2 If so, the conditional expression is true, and Java enters the for loop The value of x is zero, making the conditional expression true Java enters the loop and executes the Systemoutprintln() statement that displays the value of variable x on the screen After this statement executes, Java evaluates the third expression The third expression increments the value of variable x The value of variable x becomes 1 Java then evaluates the second expression to determine whether it should reenter the loop Because the value of x is still less than 2, Java again enters the for loop and displays the value of x on the screen Once again, Java evaluates the third expression and increments the value of x, changing its value to 2 The second expression is then evaluated This time, the value
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