Java Programming · all questions

Interfaces and Abstract Classes
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309

Questions

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Q221

Which of these class holds a collection of static methods and variables?

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Q222

What will be the output of the following Java code?

class Output 
{
    public static void main(String args[]) 
    {
        byte a[] = { 65, 66, 67, 68, 69, 70 };
        byte b[] = { 71, 72, 73, 74, 75, 76 };  
        System.arraycopy(a, 1, b, 3, 0);
        System.out.print(new String(a) + " " + new String(b));
    }
}

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Q223

Which of these class can generate pseudorandom numbers?

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Q224

Which of these method returns a largest whole number less than or equal to variable X?

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Q225

Which of these methods of a Thread class is used to suspend a thread for a period of time?

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Q226

Which of these method of Object class can generate duplicate copy of the object on which it is called?

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Q227

Which of these packages contain classes and interfaces used for input & output operations of a program?

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Q228

Which of this interface is implemented by Thread class?

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Q229

Which of these methods return a smallest whole number greater than or equal to variable X?

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Q230

Which of these class is not a member class of java.io package?

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Q231

Random is a final class?

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Q232

Which of these method converts radians to degrees?

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Q233

What will be the output of the following Java program?

class Output
{
    public static void main(String args[])
    {
  char a = (char) 98;
        a = Character.toUpperCase(a);
        System.out.print(a);
    }
}

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Q234

Which of these type parameters is used for a generic class to return and accept a number?

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Q235

Which of the following package stores all the simple data types in java?

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Q236

Which of the following methods is a method of wrapper Integer for obtaining hash code for the invoking object?

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Q237

Which of these method return a pseudorandom number?

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Q238

Which of these class have only one field?

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Q239

What will be the output of the following Java program?

class Output
{
    public static void main(String args[])
    {
        String str = "TRUE";
        boolean x = Boolean.valueOf(str);
        System.out.print(x);
    }
}

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Q240

Which of these methods is used to obtain value of invoking object as a long?

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