Core Java Multiple Choice Questions And Answers
Here you will get Java Quiz as Multiple Choice Questions And Answers for you next job or exam
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public class MyThread implements Runnable
{
public void run()
{
System.out.println("running");
}
public static void main(String args[])
{
Thread t= new Thread(new MyThread());
t.run();
t.run();
t.start();
}
}- Compilation fails
- An Exception is thrown at runtime
- The code executes and prints "running"
- The code executes and prints "runningrunning"
- The code executes and prints "runningrunningrunning"
- Inheritance represents an is-a relationship
- Inheritance represents an has-a relationship
- Interfaces must be used when creating a has-a relationship
- Instance variables can be used when creating a has-a relationship
package p1;
class Target
{
public String name = "hello";
}- any class
- only the Target class
- any class in the p1 package
- any class that extends Target
- A final method in class x can be abstract if and only if X is abstract
- A protected method in class x can be overridden by any subclass of x
- A private static method can be called only within other static methods in class X
- A non-static public final method in class X can be overridden in any subclass of X
- A public static method in class X can be called by a subclass of X without explicitly referencing the class x
- A method with the same signature as a private final method in class X can be implemented in a subclass of X
class SimpleCalc
{
public int value;
public void calculate()
{
value +=7;
}
}
public class MultiCalc extends SimpleCalc
{
public void calculate()
{
value -=3;
}
public void calculate(int multiplier)
{
calculate();
super.calculate();
value *= multiplier;
}
public static void main(String args[])
{
MultiCalc calculator = new MultiCalc();
calculator.calculate(2);
System.out.println("Value is: "+ calculator.value);
}
}- Value is : 8
- Compilation fails
- Value is : 12
- Value is : -12
- The code runs with no output
- An exception is thrown at runtime
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