Question

The method m() of class B overrides the m() method of class A, true or false? class A int i; public void maint i) { this.is } } class B extends A{ public void m(Strings) { 1 Select one: True False For the following code, which statement is correct? public class Test { public static void main(String[] args) { Object al = new AC: Object a2 = new Object(); System.out.println(al); System.out.println(a): } } class A intx @Override public String toString() return "A's x is " + x; 1 Select one: a. When executing System.out.println(a1), the toString() method in the Object class is invoked. b. When executing System.out.println(al), the toString(method in the A class is invoked. C. The program cannot be compiled, because System.out.println(al) is wrong.

Answer 1

The method m() of class B overrides the m() method of class A, true or false?
class A{
int i;
public void m(int i)
{
this.i=i;
}
}
class B extends A

{
public void m(String s)

{
  
}
}

ANSWER: false

For the following code, which statment is correct?
public class Test
{
   public static void main(String[] args)
   {
   Object a1=new A();
   Object a2=new Object();
   System.out.println(a1);
   System.out.println(a2);
      
   }
}
class A
{
int x;
@Override
public String toString()
{
return "A's x is"+x;
}
}

ANSWER:  option -B

when executing System.out.println(a1) the toString() method in A class invoked.

What is the output of the following code:
public class Foo
{
public static void main(String[] args)
{
Person person=new Person();
person.printPerson();
  
Student student =new Student();
student.printPerson();
}
}
class Student extends Person
{
private String getInfo()
{
return "Student";
}
}
class Person
{
private String getInfo()
{
return "Person";
}
public void printPerson()
{
System.out.print(getInfo()+" ");
}
}

ANSWER: option - C

Person Person

Given the following code, which line has compile error.
public class Test
{
public static void main(String[] args)
{
m(new GraduateStudent());
m(new Student());
m(new Person());
}
public static void m(Student x)
{
System.out.println(x.toString());
}
}
class GraduateStudent extends Student{
}
class Student extends Person
{
@Override
public String toString()
{
return "Student";
}
  
}
class Person extends Object
{
@Override
public String toString()
{
return "Person";
}
  
}

ANSWER: option -C

m(new Person());