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Oracle 1z0-808認定試験は、Javaプログラミング言語の基礎を持つJava開発者の知識とスキルをテストするために設計されています。この試験は、Java SE 8でのプロフィシェンシーを証明し、Javaアプリケーションを開発する能力を証明したいプロフェッショナルを対象としています。この試験はOracleによって提供され、Java開発者にとって価値のある認定資格として考えられており、彼らの専門分野での専門知識を示しています。
Oracle 1Z1-808試験の準備には、Javaプログラミング言語とその概念を確実に理解する必要があります。調査ガイド、練習試験、オンラインコースなど、準備を支援するさまざまなリソースがあります。この試験に合格し、認定されることにより、Javaプログラミングの習熟度を実証し、IT業界でのキャリアの機会を高めることができます。
質問 # 192
The following grid shows the state of a 2D array:
This grid is created with the following code:
Which line of code, when inserted in place of //line n1, adds an X into the grid so that the grid contains three consecutive X's?
- A. grid[3][1] = 'X';
- B. grid[2][0] = 'X';
- C. grid[1][2] = 'X';
- D. grid[1][3] = 'X';
- E. grid[0][2] = 'X';
正解：B
質問 # 193
Given the code fragment:
Which statement is true?
- A. After line 8, none of the objects are eligible for garbage collection
- B. After line 8, three objects are eligible for garbage collection
- C. After line 8, two objects are eligible for garbage collection
- D. After line 8, one object is eligible for garbage collection
正解：D
質問 # 194
Given:
And given the code fragment:
What is the result?
- A. Compilation fails only at line n1
- B. Compilation fails only at line n2
- C. 4W 100 Auto 4W 150 Manual
- D. Null 0 Auto 4W 150 Manual
- E. Compilation fails at both line n1 and line n2
正解：E
解説：
On line n1 implicit call to parameterized constructor is missing and n2 this() must be the first line.
質問 # 195
Given:
And given the code fragment:
What is the result?
- A. Compilation fails
- B. C2C2
- C. C1C2
- D. C1C1
正解：C
質問 # 196
What is the proper way to defined a method that take two int values and returns their sum as an int value?
- A. int sum(int first, int second) { return first + second; }
- B. void sum (int first, int second) { return first + second; }
- C. int sum(int first, int second) { first + second; }
- D. int sum(int first, second) { return first + second; }
- E. sum(int first, int second) { return first + second; }
正解：A
解説：
Incorrect answers:
A: no return statement
質問 # 197
Given the code fragment:
Which two code fragments can be independently inserted at line n1 to enable the code to print the elements of the array in reverse order? (Choose two.)
- A.
- B.
- C.
- D.
- E.
正解：C、E
質問 # 198
Which code fragment cause a compilation error?
float flt = 100F;
- A. double y1 = 203.22;
- B. float flt = y1;
int y2 = 100; - C. float flt = 100;
- D. float flt = (float) 1_11.00;
- E. float flt = (float) y2;
正解：B
解説：
Exception in thread "main" java.lang.Error: Unresolved compilation problem:
Type mismatch: cannot convert from double to float
質問 # 199
Given the code fragment:
What is the result?
- A. 0
- B. 1
- C. 2
- D. 3
正解：B
解説：
質問 # 200
Given the code fragment:
What is the result?
A:
B:
C:
D:
- A. Option C
- B. Option D
- C. Option A
- D. Option B
正解：A
質問 # 201
Given the following four Java file definitions:
// Foo.java
package facades;
public interface Foo { }
// Boo.java
package facades;
public interface Boo extends Foo { }
// Woofy.java
package org.domain
// line n1
public class Woofy implements Boo, Foo { }
// Test.java
package.org;
public class Test {
public static void main(String[] args) {
Foo obj=new Woofy();
Which set modifications enable the code to compile and run?
- A. At line n1, Insert: import facades.*;At line n2, insert:import facades.Boo;import org.*;
- B. At line n1, Insert: import facades.*;At line n2, insert:import facades;import org.*;
- C. At line n1, Insert: import facades.Foo, Boo;At line n2, insert:import org.domain.Woofy;
- D. At line n1, Insert: import facades;At line n2, insert:import facades;import org.domain;
- E. At line n1, Insert: import facades.*;At line n2, insert:import facades;import org.domain.Woofy;
正解：E
質問 # 202
Given:
What is the result?
- A. Capital A
- B. simaple A default Capital A
- C. simaple A default
- D. Compilation fails.
- E. simaple A
正解：B
解説：
Here we have to use two ternary operators combined. SO first we can use to check first
condition which is x > 10, as follows;
x>10?">": (when condition false) Now we have to use another to check if x<10 as follows;
x<10?V:"=" We can combine these two by putting last ternary statement in the false
position of first ternary statement as follows;
x>10?">":x<10?'<':"="
https;//docs.oraclexom/javase/tutorial/java/nutsandbolts/if.html
質問 # 203
Given:
What is the result?
- A. 5 4 5 6
- B. 3 6 4 6
- C. 3 4 5 6
- D. 3 4 3 6
正解：A
質問 # 204
Given the code fragment:
Which code fragment, when inserted at line 9, enables the code to print true?
- A. String str2 = sb1. toString ();
- B. String str2 = str1;
- C. String str2 = "Duke";
- D. String str2 = new String (str1);
正解：B
質問 # 205
Given the following code:
What is the output?
- A. 5
4 - B. 4
21 - C. 3
5 - D. 4
5 - E. 4
4 - F. 4
7
正解：D
質問 # 206
Which three statements describe the object-oriented features of the Java language? (Choose three.)
- A. Objects can share behaviors with other objects.
- B. A main method must be declared in every class.
- C. Objects cannot be reused.
- D. A package must contain more than one class.
- E. Object is the root class of all other objects.
- F. A subclass can inherit from a superclass.
正解：A、B、F
質問 # 207
Given:
What is the result?
- A. They really match
They really match - B. They match
They really match - C. Nothing Prints
- D. They match
- E. They really match
正解：E
解説：
The strings are not the same objects so the == comparison fails.
See note #1 below.
As the value of the strings are the same equals is true.
The equals method compares values for equality.
Note: #1 ==
Compares references, not values.
The use of == with object references is generally limited to the following:
Comparing to see if a reference is null.
Comparing two enum values.
This works because there is only one object for each enum constant.
You want to know if two references are to the same object.
質問 # 208
......
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