51. What will be the output of the following program?
a)
class A
{
int x;
void m1() {
System.out.println(x);
}
}
public class B extends A
{
int y;
void m1() {
System.out.println(y);
}
}
public class Test {
public static void main(String[] args)
{
B b = new B();
b.x = 20;
b.y = 30;
b.m1();
}
}Ans: 30
b)
class A
{
int x;
void m1() {
System.out.println(x);
}
}
public class B extends A
{
int y;
void m1() {
super.x = y - 1;
System.out.println(y+ " " +x);
}
}
public class Test {
public static void main(String[] args)
{
B b = new B();
b.x = 20;
b.y = 30;
b.m1();
}
}Ans: 30 29
c)
class A {
int x = 20;
void m1(){
System.out.println(x);
}
}
public class B extends A {
int y = 30;
void m1(){
super.x = super.x + 1;
System.out.println(super.x+ " " +y);
}
}
public class Test {
public static void main(String[] args) {
A a = new B();
a.m1();
}
}Ans: 21 30
d)
class A {
public int x;
private int y;
}
public class B extends A {
void m1(){
super.y = super.x + 1;
System.out.println(super.x+ " " +super.y);
}
}
public class Test {
public static void main(String[] args) {
B b = new B();
b.x = 20;
b.y = 30;
b.m1();
}
}Ans: Compilation error.
e)
class A
{
public int x;
public int y;
A() {
x = 10;
y = 20;
}
}
public class B extends A {
int z;
B() {
super();
}
}
public class Test {
public static void main(String[] args)
{
B b = new B();
System.out.println(b.x+ " " +b.y);
}
}Ans: 10 20
f)
class A {
public int x;
protected int y;
}
public class B extends A {
int y;
void m1(){
super.y = 10;
System.out.println(x+ " " +super.y+ " " +y);
}
}
public class Test {
public static void main(String[] args) {
B b = new B();
b.x = 20;
b.y = 30;
b.m1();
}
}
Ans: 20 10 30
g)
class A {
public int x;
protected int y;
}
public class B extends A {
int y;
void m1(){
super.y = super.x + y;
System.out.println(x+ " " +super.y+ " " +y);
}
}
public class Test {
public static void main(String[] args) {
B b = new B();
b.x = 20;
b.y = 30;
b.m1();
}
}Ans: 20 50 30
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