1Z1-803無料問題集「Oracle Java SE 7 Programmer I」

質問 1

public class StringReplace {
public static void main(String[] args) {
String message = "Hi everyone!";
System.out.println("message = " + message.replace("e", "X")); }
}
What is the result?

（A）A compile time error is produced.

（B）message = Hi XvXryonX!

（C）message = Hi Xveryone!

（D）message =

（E）A runtime error is produced.

（F）message = Hi everyone!

正解：B 解答を投票する

質問 2

Given: What is the result?

（A）true true

（B）false false

（C）false true

（D）Compilation fails

（E）true false

正解：C 解答を投票する

質問 3

Given the code fragment:
// insert code here arr[0] = new int[3]; arr[0][0] = 1; arr[0][1] = 2; arr[0][2] = 3;
arr[1] = new int[4]; arr[1][0] = 10; arr[1][1] = 20; arr[1][2] = 30; arr[1][3] = 40;
Which two statements, when inserted independently at line // insert code here, enable the code to compile?

（A）int [] [] arr = new int [2] [0];

（B）int [] [] arr = new int [2];

（C）int [] [] arr = null;

（D）int [] [] arr = new int [0] [4];

（E）int [] [] arr = new int [2] [ ];

（F）int [] [] arr = new int [] [4];

正解：A、E 解答を投票する

質問 4

Give:
Public Class Test {
}
Which two packages are automatically imported into the java source file by the java compiler?

（A）Java.lang

（B）Java.util

（C）The package with no name

（D）Javax.net

（E）Java.awt

（F）Java.*

正解：A、C 解答を投票する

解説: (JPNTest メンバーにのみ表示されます)

質問 5

Given:
public class Painting {
private String type;
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
public static void main(String[] args) {
Painting obj1 = new Painting();
Painting obj2 = new Painting();
obj1.setType(null);
obj2.setType("Fresco");
System.out.print(obj1.getType() + " : " + obj2.getType());
}
}
What is the result?

（A）Fresco : Fresco

（B）: Fresco

（C）null : Fresco

（D）A NullPointerException is thrown at runtime

正解：C 解答を投票する

質問 6

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）aa bb cc

（B）aa cc

（C）cc

（D）Compilation fails.

（E）cc dd

正解：B 解答を投票する

質問 7

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

（A）implements the Collection API

（B）reduces memory footprint

（C）dynamically resizes based on the number of elements in the list

（D）is multi.thread safe

正解：B、C 解答を投票する

解説: (JPNTest メンバーにのみ表示されます)

質問 8

Given:
public class MyFor {
public static void main(String[] args) {
for (int ii = 0; ii < 4; ii++) {
System.out.println("ii = "+ ii);
ii = ii +1;
}
}
}
What is the result?

（A）ii = 0 ii = 2

（B）ii = 0 ii = 1 ii = 2 ii = 3

（C）ii =

（D）Compilation fails.

正解：A 解答を投票する

質問 9

Which three statements are true about the structure of a Java class?

（A）The fields need not be initialized before use.

（B）A method can have the same name as a field.

（C）The methods are mandatory components of a class.

（D）A public class must have a main method.

（E）A class can have only one private constructor.

（F）A class can have overloaded static methods.

正解：B、E、F 解答を投票する

解説: (JPNTest メンバーにのみ表示されます)

質問 10

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

（A）Dog f = new Pet();

（B）Pet e = new Beagle();

（C）Pet b = new Pet();

（D）Dog d = new Beagle();

（E）Beagle c = new Dog();

（F）Pet a = new Dog();

正解：B、D、F 解答を投票する

解説: (JPNTest メンバーにのみ表示されます)

質問 11

Given:

How many times is 2 printed as a part of the output?

（A）Twice

（B）Zero

（C）Once

（D）Compilation fails.

（E）Thrice

正解：E 解答を投票する

質問 12

Given the classes:
*AssertionError
*ArithmeticException
*ArrayIndexOutofBoundsException
*FileNotFoundException
*IllegalArgumentException
*IOError
*IOException
*NumberFormatException
*SQLException
Which option lists only those classes that belong to the unchecked exception category?

（A）FileNotFoundException, IOException, SQLException

（B）ArrayIndexOutOfBoundException, IllegalArgumentException, FileNotFoundException

（C）AssertionError, ArrayIndexOutOfBoundsException, ArithmeticException

（D）ArithmeticException, FileNotFoundException, NumberFormatException

（E）AssertionError, IOError, IOException

正解：C 解答を投票する

解説: (JPNTest メンバーにのみ表示されます)

質問 13

Given:

What is the result?

（A）An exception is thrown at runtime

（B）Compilation fails

（C）Null

（D）0

正解：A 解答を投票する

質問 14

Given the code fragment:
Int [] [] array = {{0}, {0, 1}, {0, 2, 4}, {0, 3, 6, 9}, {0, 4, 8, 12, 16}};
Systemout.printIn(array [4] [1]);
System.out.printIn (array) [1] [4]);
What is the result?

（A）4 An ArrayIndexOutOfBoundException is thrown at run time

（B）Null 4

（C）An IllegalArgumentException is thrown at run time

（D）4 Null

正解：A 解答を投票する

解説: (JPNTest メンバーにのみ表示されます)

質問 15

Given:
public class ColorTest {
public static void main(String[] args) {
String[] colors = {"red", "blue","green","yellow","maroon","cyan"};
int count = 0;
for (String c : colors) {
if (count >= 4) {
break;
}
else {
continue;
}
if (c.length() >= 4) {
colors[count] = c.substring(0,3);
}
count++;
}
System.out.println(colors[count]);
}
}
What is the result?

（A）Maroon

（B）Yellow

（C）Compilation fails

（D）A StringIndexOutOfBoundsException is thrown at runtime.

正解：C 解答を投票する

解説: (JPNTest メンバーにのみ表示されます)

質問 16

Given:

What is the result?

（A）Compilation fails due to an error at line n3

（B）Compilation fails due to an error in line n1

（C）Compilation fails due to an error at line n2

（D）100

正解：A 解答を投票する

質問 17

Given: What is the result?

（A）2 4 6 8 9

（B）1 3 5 7 9

（C）2 4 6 8

（D）1 3 5 7

正解：C 解答を投票する

1Z1-803 無料問題集「Oracle Java SE 7 Programmer I」

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