1027578
Descripción
Test por webmasterMyJavaZone, actualizado hace más de 1 año
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Creado por webmasterMyJavaZone
hace alrededor de 10 años
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Pregunta 1
Pregunta
Given the following code segment, what would be the output?
int a = 0;
int b = 0;
int c = 0;
System.out.println(a++ + " " + --b + " " + c++ + " " + a + " " + b);
Respuesta
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1 0 1 0 0
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0 0 0 0 0
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1 0 1 1 -1
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0 -1 0 1 -1
Pregunta 2
Pregunta
Which of the following string classes create mutable strings? (Choose all that apply.)
Respuesta
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String
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StringBuffer
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StringBuilder
Pregunta 3
Pregunta
Choose the simplest data structure to use to store multiple like variables that could then be accessed by an index.
Respuesta
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Primitive
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Object
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Array
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Enumeration
Pregunta 4
Pregunta
Which of the statements are correct? (Choose all that apply.)
Respuesta
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3.0 is a valid literal for an int.
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3.0 is a valid literal for a float.
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3 is a valid literal for an int.
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3 is a valid literal for a float.
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3f is a valid literal for an int.
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3f is a valid literal for a float.
Pregunta 5
Pregunta
What literal values are acceptable to use with the boolean primitive?
Respuesta
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true and false
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true, false, and null
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true, false, TRUE, and FALSE
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TRUE and FALSE
Pregunta 6
Pregunta
Which code segments related to enumerations will result in a compiler error? (Choose all that apply.)
Respuesta
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enum Coin {PENNY, NICKEL, DIME, QUARTER} Coin coin = Coin.NICKEL;
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enum Coin {PENNY, NICKEL, DIME, QUARTER} Coin coin; coin = Coin.NICKEL;
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enum Coin {PENNY, NICKEL, DIME, QUARTER} Coin coin = NICKEL;
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enum Coin {penny, nickel, dime, quarter} Coin coin = Coin.NICKEL;
Pregunta 7
Pregunta
Consider the following declarations. Which declaration has an element name that does not conform to standard naming conventions?
Respuesta
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static final int varName;
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Integer IntName;
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void getName () {…}
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public class Name {…}
Pregunta 8
Pregunta
Java 7 added the allowance of a special character to indentify places. Which declaration is correct?
Respuesta
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int investment = 1x000x000;
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int investment = 1_000_000;
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int investment = 1^000^000;
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int investment = 1-000-000;
Pregunta 9
Pregunta
What are the wrapper classes for the primitives boolean, char, short, int, and double?
Respuesta
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Boolean, Char, Short , Int , Double
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Boolean, Char, Short, Integer, Double
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Boolean, Character, Short, Int, Double
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Boolean, Character, Short, Integer, Double
Pregunta 10
Pregunta
Which of the following statements contain literal values?
Respuesta
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int maxHorsePower = 170;
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float currentHorsePower = (float) maxHorsePower;
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float idleHorsePower = ((float) currentHorsePower) / 10);
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System.out.println("Current HP: " + currentHorsePower);
Pregunta 11
Pregunta
What is the correct way to initialize a variable declared as a Penguin as a new Penguin object?
Respuesta
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Penguin p;
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Penguin p = new Penguin();
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Penguin p = new Penguin[];
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Penguin p = Penguin();
Pregunta 12
Pregunta
Which of the following are primitive data types? (Choose all that apply.)
Respuesta
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int
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boolean
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char
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Float
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String
Pregunta 13
Pregunta
Which code example makes use of arrays without producing a compiler or runtime error?
Respuesta
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public class Actor { String[] characterName = new String[3]; { characterName[0] = "Captain Video"; characterName[1] = "Quizmaster"; characterName[2] = "J.C. Money"; characterName[3] = "Jersey Joe"; } }
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public class Actor { String[] characterName = new String[1..4] { characterName[0] = "Captain Video"; characterName[1] = "Quizmaster"; characterName[2] = "J.C. Money"; characterName[3] = "Jersey Joe"; } }
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public class Actor { String characterName = new String[4]; { characterName[0] = "Captain Video"; characterName[1] = "Quizmaster"; characterName[2] = "J.C. Money"; characterName[3] = "Jersey Joe"; } }
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public class Actor { String [] characterName = new String[4]; { characterName[0] = "Captain Video"; characterName[1] = "Quizmaster"; characterName[2] = "J.C. Money"; characterName[3] = "Jersey Joe"; } }
Pregunta 14
Pregunta
Class variables, also known as static fields, have only one instance in existence. Following standing naming conventions, which answer represents a class variable?
Respuesta
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variableName
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VariableName
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ClassName:variableName
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ClassName.variableName
Pregunta 15
Pregunta
What statement about local variables is true?
Respuesta
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Local variables are declared outside of methods and are initialized with a default value.
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Local variables are declared inside of methods and are initialized with a default value.
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Local variables are declared outside of methods and are not initialized with a default value.
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Local variables are declared inside of methods and are not initialized with a default value.
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