Basic Concepts Questions

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public class A {
int add(int i, int j){
return i+j;
}
}
public class B extends A{
public static void main(String argv[]){
short s = 9;
System.out.println(add(s,6));
}
}

public class A {
int k;
boolean istrue;
static int p;
public void printValue() {
System.out.print(k);
System.out.print(istrue);
System.out.print(p);
}
}
public class Test{
public static void main(String argv[]){
A a = new A();
printValue();
}
}

public class Test{
int _$;
int $7;
int do;
public static void main(String argv[]){
Test test = new Test();
test.$7=7;
test.do=9;
System.out.println(test.$7);
System.out.println(test.do);
System.out.println(test._$);
}
}

package com;
class Animal {
public void printName(){
System.out.println("Animal");
}
}
package exam;
import com.Animal;
public class Cat extends Animal {
public void printName(){
System.out.println("Cat");
}
}
package exam;
import com.Animal;
public class Test {
public static void main(String[] args){
Animal a = new Cat();
printName();
}
}

public class A {
int i = 10;
public void printValue() {
System.out.println("Value-A");
};
}
public class B extends A{
int i = 12;
public void printValue() {
System.out.print("Value-B");
}
}
public class Test{
public static void main(String argv[]){
A a = new B();
printValue();
System.out.println(i);
}
}

public enum Test {
BREAKFAST(7, 30), LUNCH(12, 15), DINNER(19, 45);
private int hh;
private int mm;
Test(int hh, int mm) {
assert (hh >= 0 && hh <= 2 : "Illegal hour.";
assert (mm >= 0 && mm <= 59) : "Illegal mins.";
this.hh = hh;
this.mm = mm;
}
public int getHour() {
return hh;
}
public int getMins() {
return mm;
}
public static void main(String args[]){
Test t = new BREAKFAST;
System.out.println(t.getHour() +":"+t.getMins());
}
}

public class A {
static{System.out.println("static");}
{ System.out.println("block");}
public A(){
System.out.println("A");
}
public static void main(String[] args){
A a = new A();
}

public class Test {
public static void main(String[] args){                                                                                                                      int i = 010;
int j = 07;
System.out.println(i);
System.out.println(j);
}
}

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