class Train{
int speed=10;
public void getSpeed(){
System.out.println(speed);
}
public void setSpeed(int speed ){
this.speed=40;
speed=this.speed;
}
}
class BulletTrain extends Train {
int speed =20;
public void getSpeed(){
System.out.println(super.speed);
}
}
public class Program
{
public static void main(String[] args) {
Train train=new BulletTrain();
train.setSpeed(50);
train.getSpeed();
}
}

import java.util.*;
public class Program
{
public static void main(String[] args) {
HashSet<Integer> h=new HashSet<>();
h.add(null);
h.add(null);
h.add(100);
h.add(300);
h.add(400);
h.add(null);
h.add(100);
h.add(300);
Object[] o=h.toArray();
System.out.println(Arrays.toString(o));
}
}

public class Program
{
public static void main(String[] args) {
try{
int sum=5;
for(int i=-1;i<5;++i){
sum=sum/i;
}
}catch(ArithmeticException e){
System.out.println("0");
}
System.out.println(sum);
}
}

public class Program
{
static double overloadedMethod(int i,double d){
return d *= i;
}
static double overloadedMethod(double d,int i){
return i += d;;
}
public static void main(String[] args) {
System.out.println(overloadedMethod(100,100));
}
}

class Parent{
public int index=1;
}
public class Program extends Parent
{
public Program(int index){
index=index;
}
public static void main(String[] args) {
Program p=new Program(10);
System.out.println(p.index);
}
}

public class Program
{
int val;
public Program(int _val){
val=_val;
}
public static void main(String[] args) {
Program p=new Program();
Program p=new Program(10);
}
}

import java.util.ArrayList;
public class Program
{
public static void main(String[] args) {
ArrayList a=new ArrayList();
a.add("C");
a.add("E");
a.add("B");
a.add("D");
a.add("A");
a.add("Z");
a.add("M");
a.remove(1);
a.remove(3);
a.add(2,a.get(3));
a.add(a.size()+" ");
a.remove(3);
System.out.println(a);
}
}

import java.util.ArrayList;
public class Program
{
public static void main(String[] args) {
String s1="Hello World";
String s2=new String("Hello World");
String s3=s2.intern();
System.out.println((s1==s2)+" "+(s2==s3)+" "+(s1==s3));
}
}

import java.util.ArrayList;
public class Program
{
public static void main(String[] args) {
int i=0;
char[] chArray=new char[20];
chArray={'a','b','c'};
System.out.println(chArray[i = +2]});
}
}