1z1-809 試験問題を無料オンラインアクセス

Given:
interface Doable {
public void doSomething (String s);
}
Which two class definitions compile? (Choose two.)

• A.public abstract class Task implements Doable {public void doSomethingElse(String s) { }}
• B.public class Action implements Doable {public void doSomething(Integer i) { }public String doThis (Integer j) { }}
• C.public abstract class Work implements Doable {public abstract void doSomething(String s) { }public void doYourThing(Boolean b) { }}
• D.public class Do implements Doable {public void doSomething(Integer i) { }public void doSomething (String s) { }public void doThat (String s) { }}
• E.public class Job implements Doable {public void doSomething(Integer i) { }}

Given the content:

and given the code fragment:

Which two code fragments, when inserted at line 1 independently, enable the code to print "Wie geht's?"

• A.currentLocale = Locale.getInstance(Locale.GERMAN,Locale.GERMANY);
• B.currentLocale = new Locale ("de", "DE");
• C.currentlocale = new Locale();currentLocale.setLanguage ("de");currentLocale.setRegion ("DE");
• D.currentLocale = new Locale.Builder ().setLanguage ("de").setRegion ("DE").build();
• E.currentLocale = Locale.GERMAN;

Given the code fragment:
List<String> empDetails = Arrays.asList("100, Robin, HR",
"200, Mary, AdminServices",
"101, Peter, HR");
empDetails.stream()
.filter(s-> s.contains("1"))
.sorted()
.forEach(System.out::println); //line n1
What is the result?

• A.100, Robin, HR101, Peter, HR200, Mary, AdminServices
• B.E. A compilation error occurs at line n1.
• C.100, Robin, HR101, Peter, HR
• D.100, Robin, HR200, Mary, AdminServices101, Peter, HR

Given:
class CheckClass {
public static int checkValue (String s1, String s2) {
return s1 length() - s2.length();
}
}
and the code fragment:
String[] strArray = new String [] {"Tiger", "Rat", "Cat", "Lion"}
//line n1
for (String s : strArray) {
System.out.print (s + " ");
}
Which code fragment should be inserted at line n1 to enable the code to print Rat Cat Lion Tiger?

• A.Arrays.sort(strArray, CheckClass : : checkValue);
• B.Arrays.sort(strArray, (CheckClass : : new) : : checkValue);
• C.Arrays.sort(strArray, CheckClass : : new : : checkValue);
• D.Arrays.sort(strArray, (CheckClass : : new).checkValue);

Given the code fragment:

What is the result?

• A.A compilation error occurs at line n1.
• B.A compilation error occurs at line n2.
• C.2
• D.3