Boolean Logical Compound Assignment Operators: &=, ^=, |= in Java

Generator QR Code ISO/IEC18004 in Java Boolean Logical Compound Assignment Operators: &=, ^=, |=
Boolean Logical Compound Assignment Operators: &=, ^=, |=
Create QR In Java
Using Barcode maker for Java Control to generate, create QR-Code image in Java applications.
Compound assignment operators for the boolean logical operators are defined in Table 511 The left-hand operand must be a boolean variable, and the right-hand operand must be a boolean expression An identity conversion is applied implicitly on assignment
Bar Code Encoder In Java
Using Barcode drawer for Java Control to generate, create bar code image in Java applications.
196 Table 511
Scan Barcode In Java
Using Barcode scanner for Java Control to read, scan read, scan image in Java applications.
CHAPTER 5: OPERATORS AND EXPRESSIONS
QR Drawer In C#.NET
Using Barcode drawer for .NET framework Control to generate, create QR-Code image in .NET framework applications.
Boolean Logical Compound Assignment Operators Expression:
QR Code JIS X 0510 Creation In Visual Studio .NET
Using Barcode generation for ASP.NET Control to generate, create QR Code 2d barcode image in ASP.NET applications.
b &= a b ^= a b |= a
Drawing Denso QR Bar Code In VS .NET
Using Barcode encoder for Visual Studio .NET Control to generate, create QR Code ISO/IEC18004 image in VS .NET applications.
Given b and a Are of Type Boolean, the Expression Is Evaluated as:
Painting QR-Code In Visual Basic .NET
Using Barcode creator for Visual Studio .NET Control to generate, create QR Code JIS X 0510 image in .NET framework applications.
b = (b & (a)) b = (b ^ (a)) b = (b | (a))
GTIN - 13 Generation In Java
Using Barcode printer for Java Control to generate, create EAN13 image in Java applications.
See also the discussion on arithmetic compound assignment operators in Section 56, p 182 Here are some examples to illustrate the behavior of boolean logical compound assignment operators:
Bar Code Generator In Java
Using Barcode drawer for Java Control to generate, create barcode image in Java applications.
boolean b1 = false, b2 = false, b3 = false; Boolean b4 = false; b1 |= true; // true b4 ^= b1; // (1) true, unboxing in (b4 ^ b1), boxing on assignment b3 &= b1 | b2; // (2) false b3 = (b3 & (b1 | b2)) b3 = b3 & b1 | b2; // (3) true b3 = ((b3 & b1) | b2)
Encoding Barcode In Java
Using Barcode encoder for Java Control to generate, create barcode image in Java applications.
The assignment at (1) entails unboxing to evaluate the expression on the righthand side, followed by boxing to assign the boolean result It is also instructive to compare how the assignments at (2) and (3) above are performed, giving different results for the same value of the operands, showing how the precedence affects the evaluation
GTIN - 128 Encoder In Java
Using Barcode printer for Java Control to generate, create USS-128 image in Java applications.
513 Conditional Operators: &&, ||
Data Matrix ECC200 Creation In Java
Using Barcode maker for Java Control to generate, create Data Matrix image in Java applications.
The conditional operators && and || are similar to their counterpart logical operators & and |, except that their evaluation is short-circuited Given that x and y represent values of boolean or Boolean expressions, the conditional operators are defined in Table 512 In the table, the operators are listed in decreasing precedence order
Generate RoyalMail4SCC In Java
Using Barcode maker for Java Control to generate, create Royal Mail Barcode image in Java applications.
Table 512
Draw Barcode In .NET
Using Barcode encoder for ASP.NET Control to generate, create bar code image in ASP.NET applications.
Conditional Operators Conditional AND Conditional OR
Read Code 39 Extended In VS .NET
Using Barcode recognizer for VS .NET Control to read, scan read, scan image in .NET applications.
x && y x || y
Printing ANSI/AIM Code 39 In Visual Basic .NET
Using Barcode creation for .NET framework Control to generate, create Code 39 Extended image in Visual Studio .NET applications.
true if both operands are true; otherwise, false true if either or both operands are true; otherwise, false
Barcode Generator In Visual Studio .NET
Using Barcode generation for ASP.NET Control to generate, create barcode image in ASP.NET applications.
Unlike their logical counterparts & and |, which can also be applied to integral operands for bitwise operations, the conditional operators && and || can only be applied to boolean operands Their evaluation results in a boolean value Truthvalues for conditional operators are shown in Table 513 Not surprisingly, they have the same truth-values as their counterpart logical operators
Barcode Maker In C#.NET
Using Barcode creator for .NET framework Control to generate, create bar code image in VS .NET applications.
513: CONDITIONAL OPERATORS: &&, ||
Making Barcode In C#
Using Barcode drawer for Visual Studio .NET Control to generate, create barcode image in VS .NET applications.
Note that, unlike their logical counterparts, there are no compound assignment operators for the conditional operators
Code 128 Drawer In Visual C#.NET
Using Barcode printer for Visual Studio .NET Control to generate, create ANSI/AIM Code 128 image in .NET framework applications.
Table 513
Truth-values for Conditional Operators
true true false false
true false true false
x && y
true false false false
x || y
true true true false
Short-Circuit Evaluation
In evaluation of boolean expressions involving conditional AND and OR, the lefthand operand is evaluated before the right one, and the evaluation is shortcircuited (ie, if the result of the boolean expression can be determined from the left-hand operand, the right-hand operand is not evaluated) In other words, the right-hand operand is evaluated conditionally The binary conditional operators have precedence lower than either arithmetic, relational, or logical operators, but higher than assignment operators Unboxing of the operand value takes place when necessary, before the operation is performed The following examples illustrate usage of conditional operators:
Boolean b1 = 4 == 2 && 1 < 4; boolean b2 = !b1 || 25 > 8; Boolean b3 = !(b1 && b2); boolean b4 = b1 || !b3 && b2; // // // // // // // false, short-circuit evaluated as (b1 = ((4 == 2) && (1 < 4))) true, short-circuit evaluated as (b2 = ((!b1) || (25 > 8))) true false, short-circuit evaluated as (b4 = (b1 || ((!b3) && b2)))
The order of evaluation for computing the value of boolean variable b4 proceeds as follows:
(b4 = (b1 || ((!b3) && b2))) (b4 = (false || ((!b3) && b2))) (b4 = (false || ((!true) && b2))) (b4 = (false || ((false) && b2))) (b4 = (false || false)) (b4 = false)
Note that b2 is not evaluated, short-circuiting the evaluation Example 53 illustrates the short-circuit evaluation of the initialization expressions in the declaration statements above In addition, it shows an evaluation (see the declaration of b5) involving boolean logical operators that always evaluate both operands See also Example 51 that uses a similar approach to illustrate the order of operand evaluation in arithmetic expressions