visual basic barcode program Assertions are disabled at runtime by default. To enable them, use in Java

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a command-line flag -ea or -enableassertions.
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You can selectively disable assertions using the -da or
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-disableassertions flag.
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If you enable or disable assertions using the flag without any arguments,
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you re enabling or disabling assertions in general. You can combine enabling and disabling switches to have assertions enabled for some classes and/or packages, but not others.
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You can enable or disable assertions in the system classes with the -esa or
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You can enable and disable assertions on a class-by-class basis, using the
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following syntax: java -ea -da:MyClass TestClass
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You can enable and disable assertions on a package basis, and any package
you specify also includes any subpackages (packages further down the directory hierarchy).
Do not use assertions to validate arguments to public methods. Do not use assert expressions that cause side effects. Assertions aren t
guaranteed to always run, so you don t want behavior that changes depending on whether assertions are enabled.
Do use assertions even in public methods to validate that a particular
code block will never be reached. You can use assert false; for code that should never be reached, so that an assertion error is thrown immediately if the assert statement is executed.
Do not use assert expressions that can cause side effects.
Self Test
SELF TEST
The following questions will help you measure your understanding of the material presented in this chapter. You ve heard this before, and this time we really mean it: this chapter s material is crucial for the exam! Regardless of what the exam question is really testing, there s a good chance that flow control code will be part of the question. Expect to see loops and if tests used in questions throughout the entire range of exam objectives.
Flow Control (if and switch) (Sun Objective 2.1)
1. Given the following,
1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. public class Switch2 { final static short x = 2; public static int y = 0; public static void main(String [] args) { for (int z=0; z < 3; z++) { switch (z) { case y: System.out.print("0 "); case x-1: System.out.print("1 "); case x: System.out.print("2 "); } } } }
what is the result
A. 0 1 2 B. 0 1 2 1 2 2 C. Compilation fails at line 7. D. Compilation fails at line 8. E. Compilation fails at line 9. F.
An exception is thrown at runtime.
2. Given the following,
1. 2. 3. 4. 5. 6. public class Switch2 { final static short x = 2; public static int y = 0; public static void main(String [] args) { for (int z=0; z < 3; z++) { switch (z) {
4: Flow Control, Exceptions, and Assertions
7. 8. 9. 10. 11. 12. 13.
case x: System.out.print("0 "); case x-1: System.out.print("1 "); case x-2: System.out.print("2 "); } } } }
what is the result
A. 0 1 2 B. 0 1 2 1 2 2 C. 2 1 0 1 0 0 D. 2 1 2 0 1 2 E. Compilation fails at line 8. F.
Compilation fails at line 9.
3. Given the following,
1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. public class If1 { static boolean b; public static void main(String [] args) { short hand = 42; if ( hand < 50 & !b ) hand++; if ( hand > 50 ) ; else if ( hand > 40 ) { hand += 7; hand++; } else --hand; System.out.println(hand); } }
what is the result
A. 41 B. 42 C. 50 D. 51 E. Compiler fails at line 5. F.
Compiler fails at line 6.
Self Test
4. Given the following,
1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. public class Switch2 { final static short x = 2; public static int y = 0; public static void main(String [] args) { for (int z=0; z < 4; z++) { switch (z) { case x: System.out.print("0 "); default: System.out.print("def "); case x-1: System.out.print("1 "); break; case x-2: System.out.print("2 "); } } } }
what is the result
A. 0 def 1 B. 2 1 0 def 1 C. 2 1 0 def def D. 2 1 def 0 def 1 E. 2 1 2 0 def 1 2 F.
2 1 0 def 1 def 1
5. Given the following,
1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. public class If2 { static boolean b1, public static void int x = 0; if ( !b1 ) { if ( !b2 ) { b1 = true; x++; if ( 5 > 6 ) x++; } if ( !b1 ) x else if ( b2 else if ( b1 } } b2; main(String [] args) {
= x + 10; = true ) x = x + 100; | b2 ) x = x + 1000;
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