Sine value table generating

//Write a program
//to print out the following sin table
//as follow
/*
sin(0)=0.0
sin(10)=0.17364817766693033
sin(20)=0.3420201433256687
sin(30)=0.49999999999999994
sin(40)=0.6427876096865393
sin(50)=0.766044443118978
sin(60)=0.8660254037844386
sin(70)=0.9396926207859083
sin(80)=0.984807753012208
sin(90)=1.0
*/
public class sintable
{
    public static void main(String args[])
    {
        int i;
        double r,sv;
        for(i=0;i<=90;i+=10)
        {
            r=i*Math.PI/180;
            sv=Math.sin(r);
            System.out.println("sin(" + i + ")=" +sv);
        }
    }
}

jToggleButton with JToolBar === Sample

//jTobbleButton with JToolBar
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
class jf0005 extends JFrame implements ActionListener
{
    JToggleButton jt1,jt2,jt3,jt4,jt5;
    JPanel pane;
    JToolBar jtb;
    JTextField jtf1;
    String st;
    public jf0005()
    {
        super("JToggle button");
        setSize(300,200);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        st=new String();
        jt1=new JToggleButton("B");
        jtf1=new JTextField("B(off)I(off)U(off)A(off)K(off)",33);
        jt2=new JToggleButton("I");
        jt3=new JToggleButton("U");
        jt4=new JToggleButton("A");
        jt5=new JToggleButton("K");
        jtf1=new JTextField();
        jtb=new JToolBar();
        jtb.add(jt1);
        jtb.add(jt2);
        jtb.add(jt3);
        jtb.add(jt4);
        jtb.add(jt5);
        jt1.addActionListener(this);
        jt2.addActionListener(this);
        jt3.addActionListener(this);
        jt4.addActionListener(this);
        jt5.addActionListener(this);
       
        pane=new JPanel();
        pane.setLayout(new BorderLayout());
        pane.add("Center",jtf1);
        pane.add("North",jtb);
        setContentPane(pane);
        setVisible(true);
       

    }
    public void actionPerformed(ActionEvent e)
    {
        st="";
        if(jt1.isSelected())
            st=st+"B(on)";
        else
            st=st+"B(off)";

        if(jt2.isSelected())
            st=st+"I(on)";
        else
            st=st+"I(off)";

        if(jt3.isSelected())
            st=st+"U(on)";
        else
            st=st+"U(off)";

        if(jt4.isSelected())
            st=st+"A(on)";
        else
            st=st+"A(off)";

        if(jt5.isSelected())
            st=st+"K(on)";
        else
            st=st+"K(off)";
       
        jtf1.setText(st);

    }
    public static void main(String args[])
    {
        jf0005 a=new jf0005 ();
    }
}

Multiplication table of parsed argument number

//Write a program which accepts an int
//from command line argument and display
// the multiplication table for its number
class p405
{
        public static void main(String args[])
        {
                int n=Integer.parseInt(args[0]);
                int i;
                for(i=1;i<=12;i++)
                    System.out.println(i + "*" + n + "=" + i*n);
              
        }
}

A function which will print in reverse order of a number.

//Write a java program which accepts
//an integer from command line argument
//and with a function which will print
//in reverse order as follow.

// java p502 345
// 543

class p502
{ public static void printReverse(int num)
  { while(num>0)
    { System.out.print(num%10);
      num/=10;
    }
  }
  public static void main(String args[])
  {  int n;
     n=Integer.parseInt(args[0]);
     printReverse(n);
  }
}

Name for the java file which include multiple class(es).

methods to find the highest and lowest integer values in the array.

// Write a getHighest(int[] arr)
// which returns the highest
// integer value in the array.
// And also write a getlowest(int[] arr)
// which returns the lowest
// integer value in the array.
class p429
{ public static int getHighest(int []arr)
  {  int i,m;
     m=arr[0];
     for(i=1;i<arr.length;i++)
        if(m<arr[i]) m=arr[i];
     return m;
  }
  public static int getLowest(int []arr)
  {  int i,m;
     m=arr[0];
     for(i=1;i<arr.length;i++)
        if(m>arr[i]) m=arr[i];
     return m;
  }
  public static void main(String args[])
  {
    int a[]={32,4,12,5,53,10};
    System.out.println("Highest Value = " + getHighest(a));
    System.out.println("Lowest Value = " + getLowest(a));
  }
}

To run windows based program from Java

class runpaint
{
  public static void main(String args[])
  {
    try{
     Runtime.getRuntime().exec("mspaint");
     }catch(Exception e){}

  }
}

Write a program to display the name of the month of the accepted month number from command-line argument.

/*
Write a program to
display the name of
the month of the
accepted month number
from command-line
argument.
*/
class p422
{   public static String monthName(int month)
    {   String str=new String();
        switch(month)
        {  case 1 : str="January"; break;
           case 2 : str="February"; break;
           case 3 : str="March"; break;
           case 4 : str="April"; break;
           case 5 : str="May"; break;
           case 6 : str="June"; break;
           case 7 : str="July"; break;
           case 8 : str="August"; break;
           case 9 : str="September"; break;
           case 10: str="October"; break;
           case 11: str="November"; break;
           case 12: str="December"; break;
           default: str="Wrong Month value";
        }
        return str;
    }
    public static void main(String args[])
    {   int m=Integer.parseInt(args[0]);
        System.out.println(monthName(m));
    }
}

Pattern of numbers

/*
Write a java program
to print the following
pattern of numbers
Use nested loop.

1 3 5 7
3 5 7
5 7
7

*/

class p410
{
        public static void main(String args[])
        {
                int i,j,k=3;
                for(i=1;i<=7;i+=2)
                {  
                    for(j=0;j<=k;j++)
                       System.out.print(i+(j*2) + " ");
                    k--;
                    System.out.println();
                }
        }
}

Base no to the power exponent no

/*
Write a java program which will
accept base number and exponent
number from command line argument
and find the value of base to
the power of exponent
The exponent value may be negative
value.
*/

class p411b
{
   public static double power(double b,double p)
   {
        double i,v;
        v=1;
        for(i=1;i<=Math.abs(p);i++)
           v=v*b;
        if(p<0)
           v=1/v;
        return v;
   }
   public static void main(String args[])
   {
        double b,p;
        b=Double.parseDouble(args[0]);
        p=Double.parseDouble(args[1]);
        System.out.println("Result = " + power(b,p) );
   }
}

Recursive Function call at java

// Recursive Function call
// function call to itself
class recursive
{
  public static int sum(int n)
  {
    if(n==1)
      return 1;
    else
      return n+sum(n-1);
  }
  public static void main(String args[])
  {
    int a;
    a=sum(10);
    System.out.println(" Sum of 1 to 10 is "+a);
  }
}

How to add Menu Bar to JFrame

Simulation program to find the probability of getting 5 throwing a dice 100 times.

//Write a simulation program
//to find the probability of
//getting 5 throwing a dice
//100 times
class dice2
{
  public static void main(String args[])
  {
    int i,n,c=0;
    double r,p;
    for(i=1;i<=100;i++)
    {
      r=Math.random();
      n=(int)(r*6)+1;
      if(n==5) c++;
    }
    p=c/100.0;
    System.out.println("P(5)="+p);
  }
}

Finding the area of the triangle whose 3 sides are given. ....

class trianglearea
{
  public static void main(String args[])
  {
    int a,b,c;
    double s,area;
    a=Integer.parseInt(args[0]);
    b=Integer.parseInt(args[1]);
    c=Integer.parseInt(args[2]);
    s=(a+b+c)/2.0;
    System.out.println(s);
    area=Math.sqrt(s*(s-a)*(s-b)*(s-c));
    System.out.println("Area =" + area);
  }
}

The applied calculation method is shown underneath.

Understanding javax.swing.Timer

//When you want to do a process every one second
//you can use javax.swing.timer. You need to add
//actionLisenter for this like JButton
//the number n in the following will incremented
//and displayed in the JTextField after the timer
//has started for every one second

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
class timertest extends JFrame implements ActionListener
{
  JTextField jtf1;
  JPanel pane;
  int n=1;
  javax.swing.Timer t1;
 
  public timertest()
  {
    super("Timer test");
    setSize(200,100);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    jtf1=new JTextField(n+"",10);
    t1=new javax.swing.Timer(1000,this);
    t1.start();
    pane=new JPanel();
    pane.add(jtf1);
    setContentPane(pane);
    setVisible(true); 
  }
  public void actionPerformed(ActionEvent e)
  {
     if(e.getSource()==t1)
     {
         n=n+1;
         jtf1.setText(""+n);
     }
  }
  public static void main(String args[])
  {
    timertest one=new timertest();
  }
}

Beep from your speaker

//The following program will generate 5 beeps per 2 second.
class testforbeep
{
  public static void main(String args[])
  {
    int i;
    for(i=1;i<=5;i++)
    {
        try{Thread.sleep(2000);}catch(InterruptedException ie){}
        java.awt.Toolkit.getDefaultToolkit().beep();
    }
  }
}

To generate beep from your computer speaker, write the following code.
 
java.awt.Toolkit.getDefaultToolkit().beep();

How to generate random numbers.

// The following program will generate 

// random number like the numbers gained by throwing a dice.

class dice

{

  public static void main(String args[])

  {

    int i,n;

    double r;

    for(i=1;i<=10;i++)

    {

      r=Math.random();

      n=(int)(r*6)+1;

      System.out.println(n);

    }

  }

}

The following illustration show how to write code for generating random numbers starting from 17 to 20. This mean the generated random numbers will be 17, 18, 19, 20.

Computer's current date, month, year, days of the week

class today
{
  public static void main(String args[])
  {
    //Today's date, month, year, days of the week
    String days[]={"Sun","Mon","Tue","Wed","Thu","Fri","Sat"};
    java.util.Date d1=new java.util.Date();
    System.out.println(d1.getDate());
    System.out.println(d1.getMonth()+1);
    System.out.println(d1.getYear()+1900);
    System.out.println(days[d1.getDay()]);
  }
}

Fahrenheit to Centigrade

// To find the equivalent
// degree in celcius
// for the fahrenheit degree
// from command line arguments
class circle
{
  public static void main(String args[])
  {
    double f,c;
    f=Double.parseDouble(args[0]);
    c=5/9.0*(f-32);
   
    System.out.println(c+"(C)= "+f+"(F)");
  }
}

To find the area and circurference of a circle whose radius is accepted from command line arguments

// To find the area and
// circurference of a circle
// whose radius is accepted
// from command line arguments
class circle
{
  public static void main(String args[])
  {
    double r,a,c;
    r=Double.parseDouble(args[0]);
    a=Math.PI*r*r;
    c=2*Math.PI*r;
    System.out.println("Area = "+a);
    System.out.println("Circurference = "+c);
  }
}

sum of .......

//sum of 1 to 100
int i,s=0;
for(i=1;i<=100;i++)
s=s+i;

//s contain 5050 which is sum of 1 to 100

//sum of 2+4+6+8+...+100
int i,s=0;
for(i=2;i<=100;i+=2)
s=s+i;

//s contain sum of 2+4+6+8+...+100

//sum of 3+7+11+15+...+79
int i,s=0;
for(i=3;i<=79;i+=4)
s=s+i;

//s contain sum of 3+7+11+15+...+79 

sum of 1+4+9+16+25+36+49+64+81+100

//sum of 1+4+9+16+25+36+49+64+81+100
int i,s=0;
for(i=1;i<=10;i++)
s=s+i*i;

//s contain sum of 1+4+9+16+25+36+49+64+81+100

integer ----> decimal, binary, octal, hexadecimal printing

// integer decimal, binary, octal, hexadecimal printing
int n=245;
String st1,st2,st3,st4;
st1=""+n;
st2=Integer.toBinaryString(n);
st3=Integer.toOctalString(n);
st4=Integer.toHexString(n);
System.out.println(st1);
System.out.println(st2);
System.out.println(st3);
System.out.println(st4);