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Cuestionario 18. 1Z0-808

posted on 15 abril, 2019

A continuación tienes las preguntas relacionadas con este capítulo del curso.

Cuestionario 18. 1Z0-808

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Pregunta 1 de 5
1. Pregunta
Given the for loop construct:
```
for ( expr1 ; expr2 ; expr3 ) {
    statement;
}
```
Which two statements are true?
- This is not the only valid for loop construct; there exits another form of for loop constructor.
- The expression expr1 is optional. it initializes the loop and is evaluated once, as the loop begin.
- When expr2 evaluates to false, the loop terminates. It is evaluated only after each iteration through the loop.
- The expression expr3 must be present. It is evaluated after each iteration through the loop.
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Pregunta 2 de 5

2. Pregunta

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

message = Hi everyone!
message = Hi XvXryonX!
A compile time error is produced.
A runtime error is produced.
message =
message = Hi Xveryone!

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Pregunta 3 de 5
3. Pregunta
Which three statements are benefits of encapsulation?
- Allows a class implementation to change without changing the clients
- Protects confidential data from leaking out of the objects
- Prevents code from causing exceptions
- Enables the class implementation to protect its invariants
- Permits classes to be combined into the same package
- Enables multiple instances of the same class to be created safely
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Pregunta 4 de 5

4. Pregunta

Given the code fragment:

String[] colors = {"red", "blue", "green", "yellow", "maroon", "cyan"};

Which code fragment prints blue, cyan?

for (String c : colors) {

    if (c.length() != 4) {

        continue;

    }

    System.out.print(c + ", ");

}

for (String c : colors[]) {

    if (c.length() <= 4) {

        continue;

    }

    System.out.print(c + ", ");

}

for (String c : String[] colors) {

    if (c.length() >= 4) {

        continue;

    }

    System.out.print(c + ", ");

}

for (String c : colors) {

    if (c.length() >= 4) {

        System.out.print(c + ", ");

        continue;

    }

}

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Pregunta 5 de 5
5. Pregunta
Which code fragment cause a compilation error?
- float flt = 100F;
- float flt = (float) 1_11.00;
- float flt = 100;
- double y1 = 203.22;
  
  float flt = y1;
- int y2 = 100;
  
  float flt = (float) y2;
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