Java program to implement single inheritance

import java.io.*;   class employee   {     private String empname;     private  int empcode;   void read(String s,int p)   {     empname= s;     empcode=p;   }  void display()   {     System.out.println("The employee name is :" +empname);     System.out.println("The employee code is :"+empcode);   }  }  class labourer extends employee     { private String labourtype;     private int laboursalary;   void read1()throws IOException       {        BufferedReader br= new BufferedReader( new InputStreamReader (System.in));        System.out.println("Enter the employee name:");        String a=br.readLine();        System.out.println("Enter the employee code :");        int p= Integer.parseInt(br.readLine());        read(a,p);        System.out.println("Enter the labourtype :");        labourtype = br.readLine();        System.out.println("Enter the labour salary :");        laboursalary=Integer.parseInt(br.readLine());     }    void display1()       {            display();       System.out.println(" The labour type is : "+ labourtype);       System.out.println(" The labour salary is :"+laboursalary);   }  } class single        { public static void main (String s[])throws IOException       {BufferedReader br = new BufferedReader(new InputStreamReader(System.in));         System.out.println("Enter the number of employees");         int n = Integer.parseInt(br.readLine());         labourer l[]= new labourer[n];         for(int i=0; i<n; i++)         l[i]= new labourer();         for(int i=0; i<n; i++)         l[i] .read1();         for(int i=0; i<n; i++)       l[i].display1(); }     } Output

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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 Implement Runnable class

class childthread implements Runnable
{
Thread t;
childthread()
{
t=new Thread(this,"odd");
System.out.println("child created "+t);
t.start();
}
public void run()
{
try
{
for(int i=1;i<10;i++)
 {
 System.out.println("child "+i);
 i++;
 Thread.sleep(500);
 }
}
catch(InterruptedException e)
{}
}
}
class oddeventhread
{
public static void main(String[] s)
{
 childthread c= new childthread();
try
{
 for(int i=2;i<=10;i++)
  {
   System.out.println("even "+i);
   i++;
   Thread.sleep(1000);
  }
}
catch(InterruptedException e)
{}
}
}

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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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