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The switch Statement The switch Statement Nested if Statements Nested if Statements The switch statement evaluates an expression, then attempts to match the result to one of several possible cases Examples Each case contains a value and a list of statements The flow of control transfers to statement associated with the first value that matches if (sum < 10) myType = 1; else if (sum < 20) myType = 2; else if (sum < 30) myType = 3; else myType = 4; if (sum < 20) if (sum < 10) myType = 1; else myType = 2; else if (sum < 30) myType = 3; else myType = 4; 14 13 The switch Statement The switch Statement The switch Statement The switch Statement switch (max) { case 10: System.out.println (“Ten"); break; case 9: System.out.println (“Nine"); break; case 8: System.out.println (“Eight"); break; default: System.out.println (“Don’t know."); } The general syntax of a switch statement is: switch ( expression ) { case value1: statement-list1 case value2: statement-list2 case ... } If expression matches value2, control jumps to here 16 15
The switch Statement The switch Statement The switch Statement The switch Statement A switch statement can have an optional default case The expression of a switch statement must result in either int or char type The default case has no associated value and simply uses the reserved word default Often a break statement is used as the last statement in each case's statement list If the default case is present, control will transfer to it if no other case value matches A break statement causes control to transfer to the end of the switch statement Though the default case can be positioned anywhere in the switch, usually it is placed at the end If a break statement is not used, the flow of control will continue into the next case If there is no default case, and no other value matches, control falls through to the statement after the switch 18 17 Logical NOT Logical NOT Logical Operators Logical Operators The logical NOT ! Boolean expressions can use the following logical operators: if (!(x < 0)) System.out.println (x); ! Logical NOT && Logical AND || Logical OR They all take boolean operands and produce boolean results If x is not less than 0, x is printed. 20 19
Page 1 and 2: Outline Conditional Statements •
Page 3: Block Statements Block Statements T
Page 7 and 8: Comparing Strings Comparing Strings
Page 9 and 10: Assignment Operators Assignment Ope
Page 11 and 12: The while Statement The while State
Page 13: Choosing a Loop Structure Choosing

X - AS Nida

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