Declaration and Access Control Name the keyword that makes a variable belong to a class, rather than being defined for each instance of the class. abstract static final native volatile abstract static final native volatile ANSWER DOWNLOAD EXAMIANS APP
Declaration and Access Control What is the result of compiling and running the following code?public class Tester{static int x = 4;int y = 9; public Tester(){System.out.print(this.x); // line 1printVariables();}public static void printVariables(){System.out.print(x); // line 2System.out.print(y); // line 3}public static void main(String... args) { // line 4new Tester();}} 49 Compile error at line 4 (invalid argument type for method main) Compile error at line 2 (must access x by writing Tester.x) Compile error at line 1 (static x must be only accessed inside static methods) Compile error at line 3 (static methods can't make reference to non-static variables) 49 Compile error at line 4 (invalid argument type for method main) Compile error at line 2 (must access x by writing Tester.x) Compile error at line 1 (static x must be only accessed inside static methods) Compile error at line 3 (static methods can't make reference to non-static variables) ANSWER DOWNLOAD EXAMIANS APP
Declaration and Access Control Suppose a class has public visibility. In this class we define a protected method. Which of the following statements is correct? This method is accessible from within the class itself and from within all classes defined in the same package as the class itself. This method is only accessible from inside the class itself and from inside all subclasses. From within protected methods you do not have access to public methods. In a class, you cannot declare methods with a lower visibility than the visibility of the class in which it is defined. This method is accessible from within the class itself and from within all classes defined in the same package as the class itself. This method is only accessible from inside the class itself and from inside all subclasses. From within protected methods you do not have access to public methods. In a class, you cannot declare methods with a lower visibility than the visibility of the class in which it is defined. ANSWER DOWNLOAD EXAMIANS APP
Declaration and Access Control A method within a class is only accessible by classes that are defined within the same package as the class of the method. Which one of the following is used to enforce such restriction? Declare the method with the keyword public and private. Do not declare the method with any accessibility modifiers. Declare the method with the keyword public. Declare the method with the keyword protected. Declare the method with the keyword private. Declare the method with the keyword public and private. Do not declare the method with any accessibility modifiers. Declare the method with the keyword public. Declare the method with the keyword protected. Declare the method with the keyword private. ANSWER DOWNLOAD EXAMIANS APP
Declaration and Access Control What is the result of compiling and running the following code?class Base{ private Base(){ System.out.print("Base"); }}public class test extends Base{ public test(){ System.out.print("Derived"); } public static void main(String[] args){ new test(); }} Compilation Error Derived BaseDerived Exception is thrown at runtime Compilation Error Derived BaseDerived Exception is thrown at runtime ANSWER DOWNLOAD EXAMIANS APP
Declaration and Access Control Determine output:class A{{System.out.print("b1 ");}public A(){System.out.print("b2 ");}}class B extends A{static{System.out.print("r1 ");}public B(){System.out.print("r2 ");}{System.out.print("r3 ");}static{System.out.print("r4 ");}}public class Test extends B{public static void main(String[] args){System.out.print("pre ");new Test();System.out.println("post ");}} r1 r4 pre b1 b2 post r3 r2 r1 r4 pre b1 b2 post pre r1 r4 b1 b2 r2 r3 post Compilation fail r1 r4 pre b1 b2 r3 r2 post r1 r4 pre b1 b2 post r3 r2 r1 r4 pre b1 b2 post pre r1 r4 b1 b2 r2 r3 post Compilation fail r1 r4 pre b1 b2 r3 r2 post ANSWER DOWNLOAD EXAMIANS APP
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