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Valid Java Method Implementations

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The document contains code snippets and questions about interfaces and classes in Java. The first code snippet shows an interface with a method and a class implementing that interface. The valid option to replace "xx" is "void doSomething() { }" as it properly defines and implements the interface method. The second snippet shows another interface with a method and implementing class. The valid option to replace "xxxxxx" is "public void draw() { }" as it is the legal definition and implementation of the interface method. The third snippet shows a Count interface with a method and counter field, and a TestCount class implementing it. The main method creates a TestCount object and calls its countUp method. The

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Given the code below:

interface MyInterface {
void doSomething ( ) ;
}
class MyClass implements MyInterface {
// xx
}
Choose the valid option that can be substituted in place of xx in the MyClass class .
public native void doSomething ( ) ;
void doSomething ( ) { /* valid code fragments */ }
private void doSomething ( ) { /* valid code fragments */ }
protected void doSomething ( ) { /* valid code fragments */ }
interface I1 {
void draw();
}
class C implements I1 {
xxxxxx
}
Which of the following when inserted at xxxxxx is a legal definition and
implementation ?
void draw() { }
public void draw() { }
protected void draw() { }
abstract void draw() { }
Given the following,
1. interface Count {
2.

short counter = 0;

3.

void countUp();

4. }
5. public class TestCount implements Count {
6.
7.

public static void main(String [] args) {

8.

TestCount t = new TestCount();

9.

[Link]();

10. }
11. public void countUp() {
12.

for (int x = 6; x>counter; x--, ++counter) {

13.
14.

[Link](" " + counter);


}

15. }
16. }
What is the result?
123
0123
1234
Compilation fails

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