Java program to read and print student information

import java.io.*;
class student
{
int slno;
String name;
student()
{
name=new String();
slno=0;
}
void get()throws IOException
{
BufferedReader br= new BufferedReader(new InputStreamReader(System.in));
System.out.print("Enter the name of the student: ");
name=br.readLine();
System.out.print("\nEnter the Serial Number: ");
slno=Integer.parseInt(br.readLine());
}
void disp()
{
System.out.println("Serial Number : "+slno+"\nName : "+name);
}
}
class studmark extends student
{
int m1,m2;
studmark()
{
m1=m2=0;
}
void get()throws IOException
{
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
System.out.println("Enter the mark1: ");
m1=Integer.parseInt(br.readLine());
System.out.println("Enter the mark2: ");
m2=Integer.parseInt(br.readLine());
}
void disp()
{
System.out.println("Mark1 = "+m1+"\nMark2 = "+m2);
}
}
class personal extends studmark
{
int w,age;
personal()
{
w=age=0;
}
void get()throws IOException
{
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
System.out.println("Enter the Weight : ");
w=Integer.parseInt(br.readLine());
System.out.println("Enter the age : ");
age=Integer.parseInt(br.readLine());
}
void disp()
{
System.out.println("Weight = "+w+"\nAge = "+age);
}
}
class studinheritance
{
public static void main(String[] args)throws IOException
{
student x;
student y= new student();
x=y;
x.get();
x.disp();
studmark i;
x=i;
x.get();
x.disp();
personal p;
x=p;
x.get();
x.disp();
}
}

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Java program to perform String sorting

import java.io.*;
class stringsort
{
String s[];
int n;
stringsort(int q)
{
s=new String[q];
n=q;
}
void sortstring()throws IOException
{
BufferedReader br= new BufferedReader(new InputStreamReader(System.in));
System.out.println("Enter The names: ");
for(int i=0;i<s.length;i++){
System.out.print("name: "+(i+1));
s[i]=br.readLine();}
}
void sort()
{
for(int i=0;i<s.length-1;i++)
for(int j=i+1;j<s.length;j++)
{
if(s[i].compareTo(s[j])>0)
{
String temp=s[i];
s[i]=s[j];
s[j]=temp;
}
}
System.out.println("\nThe sorted array is: ");
for(int i=0;i<s.length;i++)
System.out.println(s[i]);
}
public static void main(String[] args)throws IOException
{
BufferedReader b= new BufferedReader(new InputStreamReader(System.in));
System.out.println("\nEnter no of names : " );
int x=Integer.parseInt(b.readLine());
stringsort s=new stringsort(x);
s.sortstring();
s.sort();
}
}

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Java program to read and print n student names

import java.io.*;
class stringop1
{
String s[];
int n;
stringop1(int x)
{
s= new String[x];
n=x;
}
void get()throws IOException
{
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
for(int i=0;i<n;i++)
{
System.out.print("\nName of student "+(i+1)+" : ");
s[i]=br.readLine();
}
}
void disp()
{
System.out.print("\nThe Entered names are : ");
for(int i=0;i<n;i++)
System.out.print("\nName "+(i+1)+" : " +s[i]);
}
public static void main(String[] args)throws IOException
{
BufferedReader b=new BufferedReader(new InputStreamReader(System.in));
System.out.print("\nEnter the no.of students : ");
int x=Integer.parseInt(b.readLine());
stringop1 s=new stringop1(x);
s.get();
s.disp();
}
}

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Java program to find reverse of a number

import java.io.*;
class reversenum
{
int num,dup,rev,rem;
reversenum()
{
rev=rem=0;
}
void get()throws IOException
{
BufferedReader br= new BufferedReader(new InputStreamReader(System.in));
System.out.print("Enter the number : ");
num=Integer.parseInt(br.readLine());
dup=num;
while(dup>0)
{
rem=dup%10;
rev=rev*10+rem;
dup=dup/10;
}
}
void disp()
{
System.out.println("\nThe reverse of " +num+" is "+rev);
}
public static void main(String[] args)throws IOException
{
reversenum r=new reversenum();
r.get();
r.disp();
}
}

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Java program to read and print n student information

import java.io.*;
class nstudio
{
String s[];
int num;
nstudio(int m)
{
s= new String[10];
num=m;
}
void getdata()throws IOException
{
BufferedReader br= new BufferedReader( new InputStreamReader(System.in));
System.out.println("Enter "+num+" Names : ");
for(int i=0;i<num;i++)
{
System.out.print(i+1+ " : ");
s[i]=br.readLine();
}
}
void dispdata()
{
System.out.println("\n The Entered Names are :");
for(int i=0;i<num;i++)
{
System.out.println(i+1+" : "+s[i]);
}
}
public static void main(String[] args)throws IOException
{
nstudio n= new nstudio(10);
n.getdata();
n.dispdata();
}
}

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Java Program to implement multilevel inheritance

import java.io.*;
class xyz
{
int x,y;
void get() throws IOException
{
BufferedReader br= new BufferedReader( new InputStreamReader (System.in));
System.out.print("Enter a num : ");
x=Integer.parseInt(br.readLine());
System.out.print("Enter a num : ");
y=Integer.parseInt(br.readLine());
}
}
class abc extends xyz
{
int a;
void calc()
{
a=x+y;
System.out.println("The sum of "+x+" & "+y+" is "+ a);
}
}
class mno extends abc
{
int s;
void disp()
{
s=x-y;
System.out.println("Difference : "+ s);
}
}
class inheritance
{
public static void main(String[] args) throws IOException
{
mno d= new mno();
d.get();
d.calc();
d.disp();
}
}

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Java program to Compare elements of an array

import java.io.*;
class compelarray
{
int a[],big,small,n;
compelarray(int x)
{
n=x;
a=new int[n];
}
void readarray()throws IOException
{
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
System.out.println("Enter elements of array: ");
for(int i=0;i<n;i++)
a[i]=Integer.parseInt(br.readLine());
}
void compare()
{
big=small=a[0];
for(int i=0;i<n;i++)
{if(big<a[i])
big=a[i];
if(small>a[i])
small=a[i];
}
System.out.println("The biggest element is : "+big);
System.out.println("The smallest element is : "+small);
}
public static void main(String[] args)throws IOException
{
int size;
BufferedReader br2 = new BufferedReader(new InputStreamReader(System.in));
System.out.println("Enter size of the array : ");
size=Integer.parseInt(br2.readLine());
compelarray c= new compelarray(size);
c.readarray();
c.compare();
}
}

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