Control Structure of Java Program

Q .Write a Java program which will accept and print the Number within the given range.
Program:- 

class NumGen
{
int n;
void set(int x)
{
n=x;
}
void generate()
{
if (n<=0)
{
System,out.println(n+"This is invalid input Please Enter Positive Number");
}
else
{
System,out.println("Number within"+n);
for (int i=1; i<=n ; i++)
{
System.out.println(+i);
}
}
}
}
class NumGenDemo
{
public static void main(String[] k)
{
if (k.length!=1)
{
System.out.println("Plz Enter The One number");
}
else
{
int x=Integer.parseInt(k[0]);
NumGen ng=new NumGen();
ng.set(x);
ng.generate();
}
}
}

➧ In the above image we have to compile the java program by using the Javac Tool with the class name called NumGenDemo. 

    Ex:- Javac NumGemDemo.java

➧ After Compile the java program then execute the program by using the Java Tool and also give the values thought cmd prompt.

    Ex:- Java NumGenDemo -12

➧ Here -12 This is the invalid input please Enter The Positive Number.

➧ Again execute and and give the positive number.

Q .Write a Java program which will accept and print the Number Even Numbers and odd numbers .

Program:-

class EvenOdd

{

int n;

void set(int x)

{

n=x;

}

void findEvenOdd()

{

if (n<=0)

{

System.out.println(n+"Please Enter the Positive Number")

}

else

{

System.out.println("Even Number");

for (int i=2;i<=n ;i++ )

{

System.out.println(i);

}

System.out.println("Even Number");

for (int i=1;i<=n ;i++ )

{

System.out.println(i);

}

}

}

}

class  EvenOddDemo

{

public static void main(String[] k) 

{

if (k.length!=1)

{

System.out.println("Please Enter the One Number");

}

else

{

int x=Integer.pasrInt(k[0]);

EvenOdd e=new EvenOdd();

e.set(x);

e.findEvenOdd();

}

}

}