how to generate barcode in vb.net 2008 Programming with Java Operators and Strings in Java

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Programming with Java Operators and Strings
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The following are similar statements, but using the not equal to operator.
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System.out.println(a != b); // Prints true, different references System.out.println(a != c); // Prints true, different references System.out.println(b != c); // Prints false, same references
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Numeric Promotion of Binary Values By this point, you may be wondering what the compiler does with the operands when they are of different primitive types. Numeric promotion rules are applied on binary values for the additive (+, -), multiplicative (*, /, %), comparison (<, <=, >, >=), equality (==, !=), bitwise (&, ^, |), and conditional ( :) operators. See Table 3-3.
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logical Operators
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Logical operators return Boolean values. Three are logical operators on the exam: logical AND, logical OR, and logical negation.
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logical (Conditional) Operators
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Logical (conditional) operators evaluate a pair of Boolean operands. Understanding their short-circuit principle is necessary for the exam.
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n && logical AND (conditional-AND) operator n || logical OR (conditional-OR) operator
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The logical AND operator evaluates the left and right operands. If both values of the operands have a value of true, then a value of true is returned. The logical AND is considered a short-circuit operator. If the left operand returns false, then there is no
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TABlE 3-3
Binary Numeric Promotion
Check 1 Check 2 Check 3 Check 4 Check if one and only one operand is a double primitive. If so, convert the non-double primitive to a double, and stop checks. Check if one and only one operand is a float primitive. If so, convert the non-float primitive to a float, and stop checks. Check if one and only one operand is a long primitive. If so, convert the non-long primitive to a long, and stop checks. Convert both operands to int.
Numeric Promotion of Binary Values
Understanding Fundamental Operators
need to check the right operator since both would need to be true to return true; thus, it short-circuits. Therefore, whenever the left operand returns false, the expression terminates and returns a value of false.
/* Assigns true */ boolean and1 = true && true; /* Assigns false */ boolean and2 = true && false; /* Assigns false, right operand not evaluated */ boolean and3 = false && true; /* Assigns false, right operand not evaluated */ boolean and4 = false && false;
The logical OR operator evaluates the left and right operands. If either value of the operands has a value of true, then a value of true is returned. The logical AND is considered a short-circuit operator. If the left operand returns true, there is no need to check the right operator, since either needs to be true to return true; thus, it short-circuits. Again, whenever the left operand returns true, the expression terminates and returns a value of true.
/* Assigns true, right operand not evaluated */ boolean or1 = true || true; /* Assigns true, right operand not evaluated */ boolean or2 = true || false; /* Assigns true */ boolean or3 = false || true; /* Assigns false */ boolean or4 = false || false;
logical Negation Operator
The logical negation operator is also known as the inversion operator or Boolean invert operator. This is a simple operator, but don t take it lightly you may see it quite often on the exam.
n ! logical negation (inversion) operator
The logical negation operator returns the opposite of a Boolean value.
System.out.println(!false); // Prints true System.out.println(!true); // Prints false System.out.println(!!true); // Prints true System.out.println(!!!true); // Prints false System.out.println(!!!!true); // Prints true
3:
Programming with Java Operators and Strings
Expect to see the logical negation operator used in conjunction with any method or expression that returns a Boolean value. The following list details some of these expressions that return Boolean values:
n Expressions with relational operators return Boolean values. n Expressions with logical (conditional) operators return Boolean values. n The equals method of the Object class returns Boolean values. n The String methods startsWith and endsWith return Boolean values.
The following are some examples of statements that include the logical negation operator.
/* Example with relational expression */ iVar1 = 0; iVar2 = 1; if (!(iVar1 <= iVar2)) {}; /* Example with logical expressions */ boolean bVar1 = false; boolean bVar2 = true; if ((bVar1 && bVar2) || (!(bVar1 && bVar2))){} /* Example with equals method */ if (!"NAME".equals("NAME")) {} /* Example with the String class's startsWith method */ String s = "Captain Jack"; System.out.println(!s.startsWith("Captain"));
The logical inversion operator cannot be used on a non-Boolean value. The following code will not compile:
!10; // compiler error, '!' must be used with a boolean value not an integer !"STRING"; // compiler error, '!' must be used with a boolean value, not a string
Logical AND and logical OR are on the exam. Boolean AND and Boolean OR, along with bitwise AND and bitwise OR, are not on the exam. A reason why you may wish to use the nonlogical expressions associated with the right operand is if a change occurs to a variable where the new result is used later in your code. The following Scenario & Solution details the specifics of this scenario.
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