Java Programming · all questions

Interfaces and Abstract Classes
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309

Questions

6/16

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Q101

Which of the following is not a segment of memory in java?

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Q102

Which of these method of FileReader class is used to read characters from a file?

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Q103

Which of these methods is not a Locale class?

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Q104

Which of these methods is used to know whether a given Character object is part of Java's Identifiers?

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Q105

Which of the following is method of wrapper Integer for converting the value of an object into int?

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Q106

Will this Java program generate same output is executed again?

class Output 
{
    public static void main(String args[]) 
    {
        int y = double z = Math.random();
        System.out.print(y);
    }
}

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Q107

Which of these keywords is used to define interfaces in Java?

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Q108

Which of the following is an incorrect statement about packages?

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Q109

What will be the output of the following Java program?

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

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Q110

Which of these class is used to read characters in a file?

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Q111

What is JVM?

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Q112

Which of these classes encapsulate runtime environment?

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Q113

What will be the output of the following Java program?

class newthread implements Runnable 
{
Thread t;
    newthread() 
    {
        t = new Thread(this,"My Thread");
        t.start();
}
public void run() 
    {
  System.out.println(t);
}
}
class multithreaded_programing 
{
    public static void main(String args[]) 
    {
        new newthread();        
    }
}

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Q114

What will be the output of the following Java program?

class newthread implements Runnable 
{
Thread t;
    newthread() 
    {
        t = new Thread(this,"My Thread");
        t.start();
}
}
class multithreaded_programing 
{
    public static void main(String args[]) 
    {
        new newthread();        
    }
}

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Q115

What will be the output of the following Java program?

class X 
{
    int a;
    double b;
}
class Y extends X 
{
int c;
}
class Output 
{
    public static void main(String args[]) 
    {
        X a = new X();
        Y b = new Y();
        Class obj;
        obj = b.getClass();
        System.out.print(b.equals(a));
    }
}

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Q116

Which of these is a super class of wrappers Double & Integer?

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Q117

Which one of the following is a class loader?

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Q118

What will be the output of the following Java program?

class Output 
{
    public static void main(String args[]) 
    {
        Integer i = new Integer(257);  
        byte x = i.byteValue();
        System.out.print(x);
    }
}

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Q119

Which of these interfaces is implemented by TimerTask class?

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Q120

Which of the following is an incorrect statement regarding the use of generics and parameterized types in Java?

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