Oracle 1z0-809 問題集

質問 1：
Given the code fragment:

Assume that:
The required database driver is configured in the classpath.
The appropriate database is accessible with the dbURL, userName, and passWord exists The Employee table has a column ID of type integer and the SQL query matches one record.
What is the result?
A. Compilation fails at line 15.
B. The code prints Error.
C. The code prints the employee ID.
D. Compilation fails at line 14.
正解：D

質問 2：
Given:
public class Canvas implements Drawable {
public void draw () { }
}
public abstract class Board extends Canvas { }
public class Paper extends Canvas {
protected void draw (int color) { }
}
public class Frame extends Canvas implements Drawable {
public void resize () { }
abstract void open ();
}
public interface Drawable {
public abstract void draw ();
}
Which statement is true?
A. All classes compile successfully.
B. Frame does not compile.
C. Board does not compile.
D. Paper does not compile.
E. Drawable does not compile.
正解：B

質問 3：
Given:

and the code fragment:

What is the result?
A. truetrue
B. falsetrue
C. truefalse
D. falsefalse
正解：C

質問 4：
Given the code fragments:
interface CourseFilter extends Predicate<String> {
public default boolean test (String str) {
return str.contains ("Java");
}
}
and
List<String> strs = Arrays.asList("Java", "Java EE", "Embedded Java");
Predicate<String> cf1 = s - > s.length() > 3;
Predicate cf2 = new CourseFilter() { //line n1
public boolean test (String s) {
return s.startsWith ("Java");
}
};
long c = strs.stream()
.filter(cf1)
.filter(cf2//line n2
.count();
System.out.println(c);
What is the result?
A. 2
B. 3
C. A compilation error occurs at line n2.
D. A compilation error occurs at line n1.
正解：C

質問 5：
Which action can be used to load a database driver by using JDBC3.0?
A. Use the java.lang.Class.forName method to load the driver class.
B. Use the DriverManager.getDriver method to load the driver class.
C. Add the driver class to the META-INF/services folder of the JAR file.
D. Include the JDBC driver class in a jdbc.properties file.
正解：A

質問 6：
Given the code fragment:
BiFunction<Integer, Double, Integer> val = (t1, t2) -> t1 + t2; //line n1
//line n2
System.out.println(val.apply(10, 10.5));
What is the result?
A. 20.5
B. A compilation error occurs at line n2.
C. 20
D. A compilation error occurs at line n1.
正解：B

質問 7：
Given:

What is the result?
A. Hi Interface-1
B. Hi Interface-2
C. A compilation error occurs.
D. Hi MyClass
正解：D

質問 8：
Given the code fragment:
List<Double> doubles = Arrays.asList (100.12, 200.32);
DoubleFunction funD = d -> d + 100.0;
doubles.stream (). forEach (funD); // line n1
doubles.stream(). forEach(e -> System.out.println(e)); // line n2
What is the result?
A. 200.12300.32
B. A compilation error occurs at line n2.
C. 100.12200.32
D. A compilation error occurs at line n1.
正解：B
解説: (Topexam メンバーにのみ表示されます)

質問 9：
Given the code fragment:

Which statement can be inserted into line n1 to print 1,2; 1,10; 2,20;?
A. BiConsumer<Integer, Integer, Integer> c = (i, j) -> {System.out.print (i + "," + j+ "; ");};
B. BiConsumer<Integer, Integer, String> c = (i, j) -> {System.out.print (i + "," + j+ "; ")};
C. BiFunction<Integer, Integer, String> c = (i, j) -> {System.out.print (i + "," + j+ "; ")};
D. BiConsumer<Integer,Integer> c = (i, j) -> {System.out.print (i + "," + j+ "; ");};
正解：C