1z1-819事前に試験練習テストで使おう（最新297問題)
有効な1z1-819試験解答PDF一年無料更新
質問 # 75
Given:
Which two constructors will compile and set the class field strings? (Choose two.)
- A. Option C
- B. Option D
- C. Option B
- D. Option A
- E. Option E
正解：A、E
質問 # 76
Given:
Which two are correct? (Choose two.)
- A. Replacing forEach() with forEachOrdered(), the program prints 2 1 3 4 5.
- B. Replacing forEach() with forEachOrdered(), the program prints 2 1 3 4 5, but the order is unpredictable.
- C. The output will be exactly 2 1 3 4 5.
- D. The program prints 1 4 2 3, but the order is unpredictable.
- E. Replacing forEach() with forEachOrdered(), the program prints 1 2 3 4 5.
正解：D、E
解説：
質問 # 77
Given the formula to calculate a monthly mortgage payment:
and these declarations:
How can you code the formula?
- A. m = p * ((r * Math.pow(1 + r, n) / (Math.pow(1 + r, n)) - 1));
- B. m = p * (r * Math.pow(1 + r, n) / Math.pow(1 + r, n) - 1);
- C. m = p * r * Math.pow(1 + r, n) / Math.pow(1 + r, n) - 1;
- D. m = p * (r * Math.pow(1 + r, n) / (Math.pow(1 + r, n) - 1));
正解：D
質問 # 78
Given:
Which two lines inserted in line 1 will allow this code to compile? (Choose two.)
- A. private void walk(){}
- B. abstract void walk();
- C. void walk(){}
- D. public abstract void walk();
- E. protected void walk(){}
正解：D、E
質問 # 79
Given:
Which three classes successfully override printOne()? (Choose three.)
- A. Option C
- B. Option A
- C. Option E
- D. Option F
- E. Option B
- F. Option D
正解：A、B、F
質問 # 80
Which two are successful examples of autoboxing? (Choose two.)
- A. String a = "A";
- B. Long c = 23L;
- C. Integer e = 5;
- D. Float g = Float.valueOf(null);
- E. Double d = 4;
- F. Float f = 6.0;
正解：A、C
質問 # 81 
What change will cause the code to compile successfully?
- A. Insert PriceChecker <> prod on line 1.
- B. Insert PriceChecker (?) prod on line 1.
- C. Insert PriceChecker <Electronics> prod on line 1.
- D. Insert PriceChecker <Plushy extends Products> prod on line 1.
正解：B
質問 # 82
Given:
What is the output?
- A. apple:APPLE orange:ORANGE banana:BANANA
- B. APPLE:apple ORANGE:orange BANANA:banana
- C. :APPLE:ORANGE:BANANA
appleorangebanana - D. :APPLE:ORANGE:BANANA
- E. appleorangebanana
:APPLE:ORANGE:BANANA
正解：A
解説：
質問 # 83
Given:
What is the result?
- A. Orange Juice
- B. The compilation fails.
- C. The program prints nothing.
- D. Orange Juice Apple Pie Lemmon Ice Raspberry Tart
正解：D
解説：
質問 # 84
Given the code fragment:
What is the result?
- A.
- B.
- C.
- D.
正解：A
質問 # 85
Given:
Which two are correct? (Choose two.)
- A. Option C
- B. Option B
- C. Option A
- D. Option D
正解：A、D
質問 # 86
Which two describe reasons to modularize the JDK? (Choose two.)
- A. easier to understand the Java language
- B. improves security and maintainability
- C. easier to expose implementation details
- D. easier to build a custom runtime linking application modules and JDK modules
- E. improves application robustness
正解：B、E
質問 # 87
Given:
What is the expected result of javac?
- A. javac fails to compile the class and prints the error message, C:\workspace4\Mycar.java:1:error: package java does not exist
- B. javac fails to compile the class and prints the error message, Error: Could not find or load main class Mycar.class
- C. javac compiles Mycar.java without errors or warnings.
- D. javac fails to compile the class and prints the error message, C:\workspace4\Mycar.java:1:error: expected import java.lang
正解：C
質問 # 88
Given the code fragment:
Which two code fragments, independently, replace line 1 to implement the equivalent reduce operation?
- A.
- B.
- C.
- D.
- E.
正解：A、D
質問 # 89
Given:
What is the result?
- A. 5 12
- B. 6 13
- C. compilation error
- D. 0 5
正解：C
解説：
質問 # 90
Given:
jdeps -jdkinternals C:\workspace4\SimpleSecurity\jar\classes.jar
Which describes the expected output?
- A. jdeps outputs an error message that the -jdkinternals option requires either the -summary or the - verbose options to output to the console.
- B. jdeps lists the module dependencies and the package names of all referenced JDK internal APIs. If any are found, the suggested replacements are output in the console.
- C. The -jdkinternals option analyzes all classes in the .jar for class-level dependencies on JDK internal APIs. If any are found, the results with suggested replacements are output in the console.
- D. The -jdkinternals option analyzes all classes in the .jar and prints all class-level dependencies.
正解：B
解説：
Explanation
-jdkinternals option analyzes all classes in the .jar for class-level dependencies on JDK internal APIs. If any are found, the results with suggested replacements are output in the console.
質問 # 91
Given:
Which two lines of code when inserted in line 1 correctly modifies instance variables? (Choose two.)
- A. aCount = a;
- B. setGCount(g);
- C. setCCount(c) = cCount;
- D. cCount = setCCount(c);
- E. tCount = tCount;
正解：A、E
質問 # 92
Given the code fragment:
Path currentFile = Paths.get("/scratch/exam/temp.txt");
Path outputFile = Paths get("/scratch/exam/new.txt");
Path directory = Paths.get("/scratch/");
Files.copy(currentFile, outputFile);
Files.copy(outputFile, directory);
Files.delete (outputFile);
The /scratch/exam/temp.txt file exists. The /scratch/exam/new.txt and /scratch/new.txt files do not exist.
What is the result?
- A. A copy of /scratch/exam/new.txt exists in the /scratch directory and /scratch/exam/new.txt is deleted.
- B. /scratch/exam/new.txt and /scratch/new.txt are deleted.
- C. The program throws a FileaAlreadyExistsException.
- D. The program throws a NoSuchFileException.
正解：D
解説：
質問 # 93
Which module-info.java is correct for a service provider for a print service defined in the PrintServiceAPI module?
- A. module PrintServiceProvider {
requires PrintServiceAPI;
exports org.printservice.spi;
} - B. module PrintServiceProvider {
requires PrintServiceAPI;
provides org.printservice.spi.Print with
com.provider.PrintService;
} - C. module PrintServiceProvider {
requires PrintServiceAPI;
exports org.printservice.spi.Print with
D18912E1457D5D1DDCBD40AB3BF70D5D
com.provider.PrintService;
} - D. module PrintServiceProvider {
requires PrintServiceAPI;
uses com.provider.PrintService;
}
正解：A
質問 # 94
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