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As we know, default package of java.lang.*; is implicitly called if it is not explicitly called Ok, So. Package is Collection Classes ( abstract or interfaces).

Package Creation :-

1 ) First line of the program, in which you want create a package must be a your desired package name starting with package keyword and followed by semicolon.

2 ) While creating package, it is not necessary to write public before each class name.

3 ) But, each and ever method must be public.

Creating or Compiling Package :-

Syntax :-

D:\Practice\Javac -d < Path of program > < .java file name >

Complete Example :-

package TYBCS;

class Mathematics

{

public int addNumbers(int num1,int num2)

{

return(num1+num2);

}

public static double addFloatNum(double num1,double num2,double num3)

{

return(num1+num2+num3);

}

}

class Maximum

{

public int getMaxOutofThree(int n1,int n2,int n3)

{

int num=0;

if(n1>n2 && n1>n3) { num=n1; }

if(n2>n1 && n2>n3) { num=n2; }

if(n3>n1 && n3>n2) { num=n3; }

return num;

}

}

class Practice

{

public static void main(String args[])

{

Mathematics m=new Mathematics();

Maximum mx=new Maximum();

System.out.println("Addition 5+5 : "+m.addNumbers(5,5));

System.out.println("Addition f 2.5+2.5 : "+m.addFloatNum(2.5,2.5,2.5));

System.out.println("Max Number 7, 8 , 1 : "+mx.getMaxOutofThree(7,8,1));

}

}

/*

Output:-

D:\Data>javac -d D:\Data\ Practice.java

D:\Data>java TYBCS.Practice

Addition 5+5 : 10

Addition 2.5+2.5 : 7.5

Max Number 7, 8 , 1 : 8

D:\Data>

*/

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