Java Programs Lab File

Program 1 Program: WAP in java to print “Hello World”. class Hello { public static void main(String args[ ]) { System.out.println("Hello World"); } }

Program 2 Program: WAP in java to implement programs to define a class and instantiate its object. import java.io.*; class Student { int sid; String sname,sadr,sfname,smname; BufferedReader br=new BufferedReader(new InputStreamReader(System.in)); public void input()throws IOException { System.out.println("please input sid,name,fname and mname"); sid=Integer.parseInt(br.readLine()); sname=br.readLine(); sfname=br.readLine(); smname=br.readLine(); } public void display() { System.out.println("Student's id="+sid); System.out.println("Student's name="+sname); System.out.println("Student's father name="+sfname); System.out.println("Student's mother name="+smname); } } class object { public static void main(String args[ ])throws IOException { Student s=new Student(); s.input(); s.display(); } }

Program 3 Program: WAP in java to implement constructor and method overloading. class demo { int area(int a) { return(a*a); } int area(int a,int b) { return(a*b); } double area(double a) { return(3.14*a*a); } } class room { public static void main(String args[]) { demo d=new demo(); System.out.println("Area of square="+d.area(5)); System.out.println("Area of rectangle="+d.area(6,4)); System.out.println("Area of circle="+d.area(1.25)); } }

Program 4 Program: WAP in java to implement Command line argument. class ComLineTest { public static void main(String args[ ]) { int count,i=0; String s; count=args.length; System.out.println("Number of arguments="+count); while(i<count) { s=args[i]; i=i+1; System.out.println(i+":"+"java is"+s+"!"); } } }

Program 5 Program: WAP in java to implement String class. class abc { public static void main(String args[]) { int n,i,j; String s=new String("manju"); System.out.println(" Length of String="+s.length()); int l=s.length(); for(i=0;i<l;i++) { for(j=0;j<=i;j++) System.out.print(s.charAt(j)); System.out.print("n"); } } }

Program 6 Program: WAP in java to implement 2D-Arrays. import java .io.*; class element { public static void main(String args[ ])throws IOException { int a[ ][ ]=new int[3][3]; int i,j; BufferedReader br=new BufferedReader(new InputStreamReader(System.in)); System.out.println("please input nine elements for matrices"); for(i=0;i<3;i++) for(j=0;j<3;j++) a[i ][ j]=Integer.parseInt(br.readLine()); System.out.println("the matrices"); for(i=0;i<3;i++) { for(j=0;j<3;j++) System.out.println(a[i][j]+"t"); System.out.println("n"); } } }

Program 7 Program: WAP in java to implement Multi-level inheritance. import java.util.*; class multilevel { static Scanner sc=new Scanner(System.in); static class A { int a1,a2; void getdata() { System.out.println("Enter the value of a1 is:"); a1=sc.nextInt(); System.out.println("Enter the value of a2 is:"); a2=sc.nextInt(); } void putdata() { System.out.println("n The value of a1 is:"+ a1 +" and a2:"+ a2); } } static class B extends A { int b1; void add() { b1=a1+a2; System.out.println("n The Sum is:"+b1); } } static class C extends B { int c1; void mul() { c1=b1*a1; System.out.println("The product is :"+c1); } } public static void main(String args[]) { C obj=new C(); obj.getdata(); obj.add(); obj.mul(); } }

Program 8 Program: WAP in java implement the use of interface. interface my { public void show(); } class demo implements my { public void show() { System.out.println("This is interface program"); } } class sks { public static void main(String args[]) { demo d=new demo(); d.show(); } }

Program 9 Program: WAP in java implement method overriding. class One { void display() { System.out.println("I am class One"); } } class Two extends One { void display() { System.out.println("I am class Two"); } } class Overriding { void display() { System.out.println("I am from class override"); } public static void main(String args[]) { Overriding obj=new Overriding(); obj.display(); Two t=new Two(); t.display(); } }

Program 10 Program: WAP in java to implement Multithreading. class A extends Thread { public void run() { for(int i=1;i<5;i++) { System.out.println("t from Thread A:"+i); } System.out.println("Exit from Thread A"); } } class B extends Thread { public void run() { for(int j=0;j<5;j++) { System.out.println("t from Thread B:"+j); } System.out.println("Exit from Thread B"); } } class threadtest { public static void main(String args[]) { A ob=new A(); B ob1=new B(); ob.start(); ob1.start(); } }

Program 11 Program: WAP in java to implement Exception Handling. class Error { public static void main(String args[]) { int a=10,b=5,c=5,x,y; try { x=a/b-c; } catch(Exception e) {} { System.out.println("Division by zero"); } y=a/b+c; System.out.println("y="+y); } }

Program 12 Program: WAP in java to implement User-defined and pre-defined packages. package package1; public class A { public void display() { System.out.println("This is class A"); } } import package1.A; class Packagetest1 { public static void main(String args[]) { A obj=new A(); obj.display(); } }

Program 13 Program: WAP in java to implement applet using Graphics class. import java.awt.*; import java.applet.*; import java.net.*; public class star extends Applet { public void paint(Graphics g) { g.setColor(Color.green); int x[ ]={80,100,150,120,150,80,0,30,0,50}; int y[ ]={10,40,40,70,120,90,120,70,40,40}; g.drawPolygon(x,y,10); g.fillPolygon(x,y,10); } } /*<applet code="star.class"width=500 height=500></applet>*/

Program 14 Program: WAP in java to implement the use of I/O Streams. import java.io.*; class First { public static InputStreamReader input=new InputStreamReader(System.in); public static BufferedReader keyboardInput=new BufferedReader(input); static PrintWriter screenOutput=new PrintWriter(System.out,true); public static void main(String[] args)throws IOException { String name; screenOutput.print("What is your name?"); screenOutput.flush(); name=keyboardInput.readLine(); screenOutput.print("nHello"+name); screenOutput.println("java is based on independent platform"); } }

Program 15 Program: WAP in java to implement swing program. import javax.swing.*; class program extends JFrame { program() { setTitle("first form"); setSize(300,300); setVisible(true); } } class form { public static void main (String args[ ]) { program p=new program(); } }

Java Programs Lab File

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Java Programs Lab File