Tag: programming languages

Questions Related to programming languages

What is the result of compiling and running the following code ? 1. StringBuffer s1=new StringBuffer("hello"); 2. StringBuffer s2=new StringBuffer("hello"); 3. Float f1=9.0F; 4. Double f2=9.0; 5. System.out.print(f1.equals(f2)); 6. System.out.print(s1==s2); 7. System.out.print(s1.equals(s2));

technology programming languages

  1. Prints "truetruetrue"

  2. Prints "falsefalsetrue"

  3. Prints "falsefalsefalse"

  4. Compiler error on line 5

  5. Compiler error on line 7

  6. None

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Correct Option: B

What is the result of compiling and running the following code? String s=new String("hello"); StringBuffer sb=new StringBuffer("hello"); System.out.println(s.equals(sb));

technology programming languages

  1. Compiler error: String and StringBuffer objects cannot be compared

  2. ClassCastException: String and StringBuffer objects cannot be compared

  3. Prints "true"

  4. Prints "false"

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Correct Option: D

Which of the following compiles correctly if "f" is an instance of the File class?
technology programming languages

  1. String[] s =f.list();

  2. File[] files=f.list();

  3. File[] files=f.listFiles();

  4. List files=f.listFiles();

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Correct Option: A,C

What will happen when you attempt to compile and run the given code? 1. public class EqualsTest 2.{ 3. public static void main(String[] args) 4.{ 5. Boolean b = new Boolean(true); 6. String str = new String(""+b); 7. StringBuffer buff = new StringBuffer(str); 8. 9. System.out.println(b.equals(str) + ", " + 10. str.equals(buff) + ", " + 11. buff.equals(b)); 12. } 13. }
technology programming languages

  1. It will print - false, true, false

  2. It will print - true, true, false

  3. It will print - false, false, false

  4. It will print - true, false, false

  5. Compilation error

  6. ClassCastException at runtime

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Correct Option: D

Which of the following are true about the readPassword() method of the Console class? choose two
technology programming languages

  1. Its return type is String

  2. It reads the password from the console

  3. It has echoing disabled

  4. It takes a single argument

  5. None of them

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Correct Option: B,C

What is the result of compiling and running the following program? import java.util.Arrays; class Split2 { public static void main(String[] args) { String str = "She sells sea shells"; System.out.println(Arrays.toString(str.split("\s"))); } }
technology programming languages

  1. Compiler error

  2. An exception is thrown at runtime

  3. Prints [She, sells, sea, shells]

  4. Prints [he, ells, ea, hells]

  5. Prints []

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Correct Option: C

The .NET framework which provides automatic memory management using a technique called
technology programming languages

  1. Overriding

  2. Garbage Collection

  3. Assemblies

  4. Serialization

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Correct Option: B

Which browsers are supported by AJAX ?
technology programming languages

  1. Internet Explorer 5.0

  2. Netscape 7.1

  3. Firefox 1.0

  4. All of Above

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Correct Option: D

How to convert a string to integer?
technology programming languages

  1. strtod()

  2. srttoi()

  3. atoi()

  4. None of these

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Correct Option: C

What’s the .NET collection class that allows an element to be accessed using a unique key?
technology programming languages

  1. ArrayList

  2. NameValue Collection

  3. StringCollection

  4. HashTable

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Correct Option: D