1Z1-803 試験問題を無料オンラインアクセス

Given:
interface Pet { }
class Dog implements Pet { }
public class Beagle extends Dog{ }
Which three are valid?

• A.Dog f = new Pet();
• B.Pet a = new Dog();
• C.Pet b = new Pet();
• D.Beagle c = new Dog();
• E.Pet e = new Beagle();
• F.Dog d = new Beagle();

Given:
public class Test {
public static void main(String[] args) {
try {
String[] arr =new String[4];
arr[1] = "Unix";
arr[2] = "Linux";
arr[3] = "Solarios";
for (String var : arr) {
System.out.print(var + " ");
}
} catch(Exception e) {
System.out.print (e.getClass());
}
}
}
What is the result?

• A.Null Unix Linux Solaris
• B.Class java.lang.Exception
• C.Unix Linux Solaris
• D.Class java.lang.NullPointerException

Given the for loop construct:
for ( expr1 ; expr2 ; expr3 ) {
statement;
}
Which two statements are true?

• A.When expr2 evaluates to false, the loop terminates. It is evaluated only after each iteration through the loop.
• B.The expression expr3 must be present. It is evaluated after each iteration through the loop.
• C.This is not the only valid for loop construct; there exits another form of for loop constructor.
• D.The expression expr1 is optional. it initializes the loop and is evaluated once, as the loop begin.

Given the fragment:

What is the result?

• A.13480.02
• B.Compilation fails
• C.13480.0
• D.An exception is thrown at runtime

View the exhibit: What is the result when this program is executed?

• A.Bob's Name: Jian
• B.Bob's name
• C.Nothing prints
• D.Bob's Name: Bob