1Z0-803問題集、Oracle実際の試験問題

質問 1

Given:
class Base {
public static void main(String[] args) {
System.out.println("Base " + args[2]);
}
}
public class Sub extends Base{
public static void main(String[] args) {
System.out.println("Overriden " + args[1]);
}
}
And the commands:
javac Sub.java
java Sub 10 20 30
What is the result?

A. Overridden 20 Base 30

B. Overridden 20

C. Base 30

D. Base 30 Overridden 20

正解: B

質問 2

Given:
public class DoBreak1 {
public static void main(String[] args) {
String[] table = {"aa", "bb", "cc", "dd"};
for (String ss: table) {
if ( "bb".equals(ss)) {
continue;
}
System.out.println(ss);
if ( "cc".equals(ss)) {
break;
}
}
} }
What is the result?

A. Compilation fails.

B. aa cc

C. cc dd

D. aa bb cc

E. cc

正解: B

質問 3

Given:

A. Ym Xm1

B. A ClassCastException is thrown at runtime

C. Compilation fails

D. Ym Xm2

正解: D

質問 4

Given:

What is the result?

A. An exception is thrown at run time

B. Compilation fails

C. Hello

D. Default

E. The program prints nothing

正解: C

解説: (PassTest メンバーにのみ表示されます)

質問 5

Identify two benefits of using ArrayList over array in software development.

A. reduces memory footprint

B. dynamically resizes based on the number of elements in the list

C. implements the Collection API

D. is multi.thread safe

正解: A,B

解説: (PassTest メンバーにのみ表示されます)

質問 6

Given the fragment:
String[][] arra = new String[3][];
arra[0] = new String[]{"rose", "lily"};
arra[1] = new String[]{"apple", "berry","cherry","grapes"};
arra[0] = new String[]{"beans", "carrot","potato"};
// insert code fragment here
Which code fragment when inserted at line '// insert code fragment here', enables the code to successfully change arra elements to uppercase?

A. String[][] arra = new String[3][];
arra[0] = new String[]{"rose", "lily"};
arra[1] = new String[]{"apple", "berry","cherry","grapes"};
arra[0] = new String[]{"beans", "carrot","potato"};
for (int i = 0; i < arra.length; i++) {
for (int j=0; j < arra[i].length; j++) {
arra[i][j] = arra[i][j].toUpperCase();
}
}

B. for (int i = 0; i < 3; i++) {
for (int j=0; j < 4; j++) {
arra[i][j] = arra[i][j].toUpperCase();
}
}

C. for (String a[]:arra[][]) {
for (String x:a[]) {

D. for (int i:arra.length) {
for (String x:arra) {
arra[i].toUpperCase();
}
}

E. toUpperCase();
}
}

正解: C

解説: (PassTest メンバーにのみ表示されます)

質問 7

Given:
package p1;
public interface DoInterface { void method1(int n1); // line n1
}
package p3;
import p1.DoInterface;
public class DoClass implements DoInterface { public DoClass(int p1) { } public void method1(int p1) { } // line n2 private void method2(int p1) { } // line n3
}
public class Test {
public static void main(String[] args) {
DoInterface doi= new DoClass(100); // line n4
doi.method1(100);
doi.method2(100);
}
}
Which change will enable the code to compile?

A. Changing the private modifier on the declaration of method 2 public at line n3

B. Removing the public modifier from the definition of method1 at line n2

C. Adding the public modifier to the declaration of method1 at line n1

D. Changing the line n4 DoClass doi = new DoClass ( );

正解: A

解説: (PassTest メンバーにのみ表示されます)

質問 8

Given:
public class TestOperator {
public static void main(String[] args) {
int result = 30 -12 / (2*5)+1;
System.out.print("Result = " + result);
} }
What is the result?

A. Result = 28

B. Result = 29

C. Result = 30

D. Result = 3

E. Result = 2

正解: C

質問 9

Which two are valid declarations of a two-dimensional array?

A. int [2] [2] array2D;

B. int [] array2D [];

C. int [] [] array2D;

D. int [] [] array2D [];

E. int array2D [];

正解: B,C

解説: (PassTest メンバーにのみ表示されます)

質問 10

Given: Which two declarations will compile?

A. int a, b, c = 0;

B. int g, int h, int i = 0;

C. int d, e, F;

D. int a, b, c;

E. int k, l, m; = 0;

正解: A,C

質問 11

View the exhibit.

Given the code fragment:

Which change enables the code to print the following?
James age: 20 Williams age: 32

A. Enclosing line 6 and line 7 within a try block and adding: catch(Exception e1) { //code goes here} catch (missingInfoException e2) { //code goes here} catch (AgeOutofRangeException e3) {//code goes here}

B. Replacing line 5 with public static void main (String [] args) throws.Exception {

C. Enclosing line 6 and line 7 within a try block and adding: catch (missingInfoException e2) { //code goes here} catch (AgeOutofRangeException e3) {//code goes here}

D. Replacing line 5 with public static void main (String [] args) throws MissingInfoException, AgeOutofRangeException {

正解: A

Oracle Java SE 7 Programmer I - 1Z0-803 模擬練習