visual basic barcode program 3: Operators and Assignments in Java

Maker PDF417 in Java 3: Operators and Assignments

3: Operators and Assignments
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Passing Variables into Methods (Sun Objective 5.4)
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13. B. The int x in the twice() method is not the same int x as in the start() method. Start() s x is not affected by the twice() method. The instance variable s is updated by twice() s x, which is 14. A, C, and D are incorrect based on the program logic described above. 14. B. The boolean b1 in the fix() method is a different boolean than the b1 in the start() method. The b1 in the start() method is not updated by the fix() method. A, C, D, E, and F are incorrect based on the program logic described above. 15. D. When the fix() method is first entered, start() s s1 and fix() s s1 reference variables both refer to the same String object (with a value of slip ). Fix() s s1 is reassigned to a new object that is created when the concatenation occurs (this second String object has a value of slipstream ). When the program returns to start(), another String object is created, referred to by s2 and with a value of stream . A, B, C, and E are incorrect based on the program logic described above. 16. D. Because all of these expressions use the + operator, there is no precedence to worry about and all of the expressions will be evaluated from left to right. If either operand being evaluated is a String, the + operator will concatenate the two operands; if both operands are numeric, the + operator will add the two operands. A, B, C, and E are incorrect based on the program logic described above. 17. B. The reference variables a1 and a3 refer to the same long array object. When the [1] element is updated in the fix() method, it is updating the array referred to by a1. The reference variable a2 refers to the same array object. A, C, D, E, and F are incorrect based on the program logic described above. 18. C. In the fix() method, the reference variable tt refers to the same object (class Two) as the t reference variable. Updating tt.x in the fix() method updates t.x (they are one in the same object). Remember also that the instance variable x in the Two class is initialized to 0. A, B, D, E, and F are incorrect based on the program logic described above.
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Exercise Answers
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EXERCISE ANSWERS
Printing PDF417 In VB.NET
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Exercise 3-1: Using Shift Operators
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The program should look something like the following:
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class BitShift { public static void main(String [] args) { int x = 0x00000001; // or simply 1 x <<= 31; x >>= 31; System.out.println("After shift x equals " + x); } }
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The number should now equal -1. In bits, this number is
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1111 1111 1111 1111 1111 1111 1111 1111
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Exercise 3-2: Casting Primitives
The program should look something like the following:
class Cast { public static void main(String [] args) { float f = 234.56F; short s = (short)f; } }
Flow Control, Exceptions, and Assertions
CERTIFICATION OBJECTIVES
Writing Code Using if and switch Statements Writing Code Using Loops Handling Exceptions Working with the Assertion Mechanism Two-Minute Drill
Q&A Self Test
4: Flow Control, Exceptions, and Assertions
an you imagine trying to write code using a language that didn t give you a way to execute statements conditionally In other words, a language that didn t let you say, If this thing over here is true, then I want this thing to happen; otherwise, do this other thing instead. Flow control is a key part of most any useful programming language, and Java offers several ways to do it. Some, like if statements and for loops, are common to most languages. But Java also throws in a couple flow control features you might not have used before exceptions and assertions.
The if statement and the switch statement are types of conditional/decision controls that allow your program to perform differently at a fork in the road, depending on the result of a logical test. Java also provides three different looping constructs for, while, and do-while so you can execute the same code over and over again depending on some condition being true. Exceptions give you a clean, simple way to organize code that deals with problems that might crop up at runtime. Finally, the assertion mechanism, added to the language with version 1.4, gives you a way to do debugging checks on conditions you expect to smoke out while developing, when you don t necessarily need or want the runtime overhead associated with exception handling. With these tools, you can build a robust program that can handle any logical situation with grace. Expect to see a wide range of questions on the exam that include flow control as part of the question code, even on questions that aren t testing your knowledge of flow control.
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