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CHAPTER 3 Expressions and Statements
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class Demo { public static void main (String args[]) { int gradeFinalExam = 60, gradeClassProject =90; if (gradeFinalExam >= 70 || gradeClassProject >= 70) { Systemoutprintln ("Pass ); } else { Systemoutprintln ("Fail ); } } }
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Single AND Operator (&) and OR Operator (|)
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Java has two versions of the AND logical operator and the OR logical operator The first version uses a double ampersand (&&) and double vertical bar (||) The double ampersand tells Java to evaluate the first relational expression If the first relational expression is false, then Java does not evaluate the second relational expression because both relational expressions must be true in order for the AND logical operator to return a Boolean true If the first relational expression is false, then the AND logical operator must return a false Likewise, the double vertical bar (||) tells Java to evaluate the first relational expression If the first relational expression is true, then Java does not evaluate the second relational expression because only one relational expression must be true in order for the OR logical operator to return a Boolean true If the first relational expression is true, then the OR logical operator must return a true The single ampersand (&) and single vertical bar (|) versions of these logical operators tell Java to evaluate both relational expressions regardless of whether or not the first relational expression returns a true or false
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The Ternary Operator ( :)
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The ternary logical operator is more similar to an ifelse statement than it is to the AND logical operator and the OR logical operator This is because the ternary logical operator is used to have Java make a decision The ternary logical operator is composed of three elements a relational expression and two values If the relational expression is true, then Java uses the first value Otherwise, the second value is used
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Java Demystified
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The following example illustrates the ternary logical operator It begins by declaring an integer variable called gradeClassProject and initializing it with the grade 90 The next statement declares a char variable called grade and uses the ternary logical operator to determine the initial grade To the left of the question mark is the relational expression that asks Java to determine if the value of the gradeClassProject is greater than or equal to 70 If this expression is true, then the value to the right of the question mark is used If this expression is false, then the value to the right of the colon is used Although this example uses one relational expression, you can use two or more relational expressions if they are linked together using the AND logical operator or the OR logical operator
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class Demo { public static void main (String args[]) { int gradeClassProject = 90; char grade = gradeClassProject >= 70 'P' : 'F'; Systemoutprintln( "Course grade: " + grade); } }
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Bitwise Operators
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Previously in this book, you learned that information is stored inside a computer as numbers represented in the binary numbering system Most of us know this as zeros and ones You normally don t use the binary numbering system in your program Instead, you use the decimal numbering system to represent numbers, and you use the characters on your keyboard to represent characters Java takes and converts these values to binary for you when you compile and run your program However, more advanced Java programmers sometimes have a need to work with binary digits (bits) This is common for programmers who write network communications programs These programmers use bitwise operators to change the value of a bit from zero to one, or vice versa I ll show you how to use bitwise operators in this section, but you may simply want to give it a glance or skip it altogether until you move into the advanced Java programmer ranks Working at the bit level can become confusing because we normally don t view data as a bit If you decide to plunge into this section, then take your time Analyze each bitwise operation by writing the bits on paper and then change its value just as the bitwise operator tells Java to change the bit value inside your computer After you have a understanding of how a bitwise operator works, run the example to see if the result you achieve on paper matches the output of the example
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