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A Learning Portal from Recruitment India
A Learning Portal from Recruitment India
Which of these classes can return more than one character to be returned to the input stream?
BufferedReader
Bufferedwriter
PushbachReader
CharArrayReader
Answer with explanation
Answer: Option CExplanation
PushbackReader class allows one or more characters to be returned to the input stream. This allows looking ahead in the input stream and performing action accordingly.
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What will be the result of compiling and running the given code?
class A{
int b=10;
private A(){
this.b=7;
}
int f(){
return b;
}
}
class B extends A{
int b;
}
public class Test{
public static void main(String[] args){
A a = new B();
System.out.println(a.f());
}
}Prints 7
Prints 10
Prints 0
Compilation fails
Answer with explanation
Answer: Option DExplanation
The code does not compile because the constructor of class A is declared as private. This creates a problem when the subclass constructor makes an implicit super() call to the parent class constructor at the time B is instantiated.
Since the code does not compile, all the other choices are incorrect. If the constructor of A had not been private, the output would have been 7.
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Which of the following declares an abstract method in an abstract Java class?
public abstract method();
public abstract void method();
public void abstract Method();
public void method() {}
Answer with explanation
Answer: Option BExplanation
public abstract void method();
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