This is a scientific calculator; we can perform various types of calculations with it, such as arithmetic, temperature, root and square root, trigonometry, logarithmic values, powers, and increment and decrement operations.

This is a simple arithmetic calculator; the user can perform arithmetic operations.

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class Frame1 extends JFrame
{
  JTextField t1=new JTextField();
  JButton b1=new JButton("0");
  JButton b2=new JButton("1");
  JButton b3=new JButton("2");
  JButton b4=new JButton("3");
  JButton b5=new JButton("4");
  JButton b6=new JButton("5");
  JButton b7=new JButton("6");
  JButton b8=new JButton("7");
  JButton b9=new JButton("8");
  JButton b10=new JButton("9");
  JButton b11=new JButton("+");
  JButton b12=new JButton("-");
  JButton b13=new JButton("X");
  JButton b14=new JButton("/");
  JButton b15=new JButton("=");
  JButton b16=new JButton("AC");
  JButton b17=new JButton(".");
  JButton b18=new JButton("X\u00B2");
  JButton b19=new JButton("X\u00B3");
  JButton b20=new JButton("log");
  JButton b21=new JButton("sin");
  JButton b22=new JButton("cos");
  JButton b23=new JButton("tan");
  JButton b24=new JButton("ceil");
  JButton b25=new JButton("floor");
  JButton b26=new JButton("rint");
  JButton b27=new JButton("abs");
  JButton b28=new JButton("max");
  JButton b29=new JButton("min");
  JButton b30=new JButton("\u221Ax");
  JButton b31=new JButton("\u221Bx");
  JButton b32=new JButton("1/x");
  JButton b33=new JButton("ON");
  JButton b34=new JButton("00");
  JButton b35=new JButton("BIN");


Frame1()
{
  
  setSize(450,600);
  setDefaultCloseOperation(3);
  setLayout(null);
  t1.setBounds(20,20,400,60);add(t1);
  t1.setBackground(new Color(255,255,255));
  t1.setFont(new Font("Arial",1,24));
  t1.setEditable(false);
  t1.setHorizontalAlignment(4);
  b1.setBounds(20,90,50,50);add(b1);
  b2.setBounds(80,90,50,50);add(b2);
  b3.setBounds(140,90,50,50);add(b3);
  b4.setBounds(200,90,50,50);add(b4);
  b5.setBounds(260,90,50,50);add(b5);
  b6.setBounds(20,150,50,50);add(b6);
  b7.setBounds(80,150,50,50);add(b7);
  b8.setBounds(140,150,50,50);add(b8);
  b9.setBounds(200,150,50,50);add(b9);
  b10.setBounds(260,150,50,50);add(b10);
  b11.setBounds(20,210,50,50);add(b11);
  b12.setBounds(80,210,50,50);add(b12);
  b13.setBounds(140,210,50,50);add(b13);
  b14.setBounds(200,210,50,50);add(b14);
  b15.setBounds(260,210,50,50);add(b15);
  b16.setBounds(320,90,70,50);add(b16);
  b17.setBounds(20,270,50,50);add(b17);
  b18.setBounds(80,270,50,50);add(b18);
  b17.setFont(new Font("Arial",1,30));
  b19.setBounds(140,270,50,50);add(b19);
  b20.setBounds(200,270,90,50);add(b20);
  b21.setBounds(320,150,70,50);add(b21);
  b22.setBounds(320,210,70,50);add(b22);
  b23.setBounds(305,270,85,50);add(b23);
  b24.setBounds(20,330,65,50);add(b24);
  b25.setBounds(95,330,65,50);add(b25);
  b26.setBounds(170,330,65,50);add(b26);
  b27.setBounds(245,330,65,50);add(b27);
  b28.setBounds(20,390,65,50);add(b28);
  b29.setBounds(95,390,65,50);add(b29);
  b30.setBounds(170,390,65,50);add(b30);
  b31.setBounds(245,390,65,50);add(b31);
  b32.setBounds(320,330,65,50);add(b32);
  b33.setBounds(320,390,65,50);add(b33);
  b34.setBounds(20,450,65,50);add(b34);
  b35.setBounds(95,450,70,50);add(b35);
  Font ff=new Font("arial",1,25);
  b1.setFont(ff);
  b2.setFont(ff);
  b3.setFont(ff);
  b4.setFont(ff);
  b5.setFont(ff);
  b6.setFont(ff);
  b7.setFont(ff);
  b8.setFont(ff);
  b9.setFont(ff);
  b10.setFont(ff);
  b11.setFont(ff);
  b12.setFont(ff);
  b13.setFont(new Font("arial",1,15));
  b14.setFont(ff);
  b15.setFont(ff);
  b18.setFont(new Font("arial",1,15));
  b19.setFont(new Font("arial",1,15));
  b30.setFont(new Font("arial",1,15));
  b34.setFont(ff);
  b21.setFont(new Font("arial",1,20));
  b22.setFont(new Font("arial",1,20));
  b23.setFont(new Font("arial",1,20));
  b16.setFont(new Font("arial",1,20));
  b24.setFont(new Font("arial",1,15));
  b25.setFont(new Font("arial",1,12));
  b26.setFont(new Font("arial",1,15));
  b27.setFont(new Font("arial",1,15));
  b28.setFont(new Font("arial",1,15));
  b29.setFont(new Font("arial",1,15));
  b33.setFont(new Font("arial",1,20));
  b35.setFont(new Font("arial",1,20));
 
  b1.addActionListener(new ActionListener()
  {
     public void actionPerformed(ActionEvent e)
     {
         f1(e);
     }

  });
  b2.addActionListener(new ActionListener()
  {
     public void actionPerformed(ActionEvent e)
     {
         f1(e);
     }

  });
  b3.addActionListener(new ActionListener()
  {
     public void actionPerformed(ActionEvent e)
     {
         f1(e);
     }

  });
  b4.addActionListener(new ActionListener()
  {
     public void actionPerformed(ActionEvent e)
     {
         f1(e);
     }

  });
  b5.addActionListener(new ActionListener()
  {
     public void actionPerformed(ActionEvent e)
     {
         f1(e);
     }

  });
  b6.addActionListener(new ActionListener()
  {
     public void actionPerformed(ActionEvent e)
     {
         f1(e);
     }

  });
  b7.addActionListener(new ActionListener()
  {
     public void actionPerformed(ActionEvent e)
     {
         f1(e);
     }

  });
  b8.addActionListener(new ActionListener()
  {
     public void actionPerformed(ActionEvent e)
     {
         f1(e);
     }

  });
  b9.addActionListener(new ActionListener()
  {
     public void actionPerformed(ActionEvent e)
     {
         f1(e);
     }

  });
  b10.addActionListener(new ActionListener()
  {
     public void actionPerformed(ActionEvent e)
     {
         f1(e);
     }

  });
  b11.addActionListener(new ActionListener()
  {
     public void actionPerformed(ActionEvent e)
     {
         f1(e);
     }

  });
  b12.addActionListener(new ActionListener()
  {
     public void actionPerformed(ActionEvent e)
     {
         f1(e);
     }

  });
  b13.addActionListener(new ActionListener()
  {
     public void actionPerformed(ActionEvent e)
     {
         f1(e);
     }

  });
  b14.addActionListener(new ActionListener()
  {
     public void actionPerformed(ActionEvent e)
     {
         f1(e);
     }

  });
  b15.addActionListener(new ActionListener()
  {
     public void actionPerformed(ActionEvent e)
     {
         f2(e);
     }

  });
  b16.addActionListener(new ActionListener()
  {
     public void actionPerformed(ActionEvent e)
     {
         f3(e);
     }

  });
  b17.addActionListener(new ActionListener()
  {
     public void actionPerformed(ActionEvent e)
     {
         f1(e);
     }

  });
  b18.addActionListener(new ActionListener()
  {
     public void actionPerformed(ActionEvent e)
     {
         f4(e);
     }

  });
  b19.addActionListener(new ActionListener()
  {
     public void actionPerformed(ActionEvent e)
     {
         f5(e);
     }

  });
  b20.addActionListener(new ActionListener()
  {
     public void actionPerformed(ActionEvent e)
     {
         f6(e);
     }

  });
  b21.addActionListener(new ActionListener()
  {
     public void actionPerformed(ActionEvent e)
     {
         f7(e);
     }

  });
  b22.addActionListener(new ActionListener()
  {
     public void actionPerformed(ActionEvent e)
     {
         f8(e);
     }

  });
  b23.addActionListener(new ActionListener()
  {
     public void actionPerformed(ActionEvent e)
     {
         f9(e);
     }

  });
  b24.addActionListener(new ActionListener()
  {
     public void actionPerformed(ActionEvent e)
     {
         f10(e);
     }

  });
  b25.addActionListener(new ActionListener()
  {
     public void actionPerformed(ActionEvent e)
     {
         f11(e);
     }

  });
  b26.addActionListener(new ActionListener()
  {
     public void actionPerformed(ActionEvent e)
     {
         f12(e);
     }

  });
  b27.addActionListener(new ActionListener()
  {
     public void actionPerformed(ActionEvent e)
     {
         f13(e);
     }

  });
  b28.addActionListener(new ActionListener()
  {
     public void actionPerformed(ActionEvent e)
     {
         f14(e);
     }

  });
  b29.addActionListener(new ActionListener()
  {
     public void actionPerformed(ActionEvent e)
     {
         f15(e);
     }

  });
  b30.addActionListener(new ActionListener()
  {
     public void actionPerformed(ActionEvent e)
     {
         f16(e);
     }

  });
  b31.addActionListener(new ActionListener()
  {
     public void actionPerformed(ActionEvent e)
     {
         f17(e);
     }

  });
  b32.addActionListener(new ActionListener()
  {
     public void actionPerformed(ActionEvent e)
     {
         f18(e);
     }

  });
  b33.addActionListener(new ActionListener()
  {
     public void actionPerformed(ActionEvent e)
     {
         f19(e);
     }

  });
  b34.addActionListener(new ActionListener()
  {
     public void actionPerformed(ActionEvent e)
     {
         f20(e);
     }

  });


}
  void f1(ActionEvent e)
  {
      String s1=t1.getText();
      String s2=e.getActionCommand();
      t1.setText(s1+s2);
  }
  void f2(ActionEvent e)
  {
      String s=t1.getText();
      int p=s.indexOf("+");
      if(p>0)
      {
         String s1=s.substring(0,p);
         String s2=s.substring(p+1);
         double x=Double.parseDouble(s1);
         double y=Double.parseDouble(s2);
         double z=x+y;
         t1.setText(z+"");
      }
      int p1=s.indexOf("-");
      if(p1>0)
      {
         String s1=s.substring(0,p1);
         String s2=s.substring(p1+1);
         double x1=Double.parseDouble(s1);
         double y1=Double.parseDouble(s2);
         double z1=x1-y1;
         t1.setText(z1+"");
      }
      int p2=s.indexOf("X");
      if(p2>0)
      {
         String s1=s.substring(0,p2);
         String s2=s.substring(p2+1);
         double x2=Double.parseDouble(s1);
         double y2=Double.parseDouble(s2);
         double z2=x2*y2;
         t1.setText(z2+"");
      }
      int p3=s.indexOf("/");
      if(p3>0)
      {
         String s1=s.substring(0,p3);
         String s2=s.substring(p3+1);
         double x3=Double.parseDouble(s1);
         double y3=Double.parseDouble(s2);
         double z3=x3/y3;
         t1.setText(z3+"");
      }
  }
  void f3(ActionEvent e)
  {
     t1.setText(" ");
  }
  void f4(ActionEvent e)
  {
     String s1=t1.getText();
     double x1=Double.parseDouble(s1);
     double x5=Math.pow(x1,2);
     t1.setText(x5+"");
  }
  void f5(ActionEvent e)
  {
     String s1=t1.getText();
     double x1=Double.parseDouble(s1);
     double x5=Math.pow(x1,3);
     t1.setText(x5+"");
  }
  void f6(ActionEvent e)
  {
     String s1=t1.getText();
     double x1=Double.parseDouble(s1);
     double x5=Math.log10(x1);
     t1.setText(x5+"");
  }
  void f7(ActionEvent e)
  {
     String s1=t1.getText();
     double x1=Double.parseDouble(s1);
     double a=Math.toRadians(x1);
     double x5=Math.sin(a);
     t1.setText(x5+"");
  }
  void f8(ActionEvent e)
  {
     String s1=t1.getText();
     double x1=Double.parseDouble(s1);
     double a=Math.toRadians(x1);
     double x5=Math.cos(a);
     t1.setText(x5+"");
  }
  void f9(ActionEvent e)
  {
     String s1=t1.getText();
     double x1=Double.parseDouble(s1);
     double a=Math.toRadians(x1);
     double x5=Math.tan(a);
     t1.setText(x5+"");
  }
  void f10(ActionEvent e)
  {
     String s1=t1.getText();
     double x1=Double.parseDouble(s1);
     double x5=Math.ceil(x1);
     t1.setText(x5+"");
  }
  void f11(ActionEvent e)
  {
     String s1=t1.getText();
     double x1=Double.parseDouble(s1);
     double x5=Math.floor(x1);
     t1.setText(x5+"");
  }
  void f12(ActionEvent e)
  {
     String s1=t1.getText();
     double x1=Double.parseDouble(s1);
     double x5=Math.rint(x1);
     t1.setText(x5+"");
  }
  void f13(ActionEvent e)
  {
     String s1=t1.getText();
     double x1=Double.parseDouble(s1);
     double x5=Math.abs(x1);
     t1.setText(x5+"");
  }
  void f14(ActionEvent e)
  {
     String s1=t1.getText();
     String s2=e.getActionCommand();
     double x1=Double.parseDouble(s1);
     double x2=Double.parseDouble(s2);
     double x5=Math.max(x1,x2);
     t1.setText(x5+"");
  }
  void f15(ActionEvent e)
  {
     String s1=t1.getText();
     String s2=e.getActionCommand();
     double x1=Double.parseDouble(s1);
     double x2=Double.parseDouble(s2);
     double x5=Math.min(x1,x2);
     t1.setText(x5+"");
  }
  void f16(ActionEvent e)
  {
     String s1=t1.getText();
     double x1=Double.parseDouble(s1);
     double x5=Math.sqrt(x1);
     t1.setText(x5+"");
  }

  void f17(ActionEvent e)
  {
     String s1=t1.getText();
     double x1=Double.parseDouble(s1);
     double x5=Math.cbrt(x1);
     t1.setText(x5+"");
  }
  void f18(ActionEvent e)
  {
     String s1=t1.getText();
     double x1=Double.parseDouble(s1);
     double x5=(1/x1);
     t1.setText(x5+"");
  }
  void f19(ActionEvent e)
  {
     t1.setText(0+"");
  }
  void f20(ActionEvent e)
  {
      String s1=t1.getText();
      String s2=e.getActionCommand();
      t1.setText(s1+s2);
  }
  
    
 
}
class SimpleAirthmaticCalculator
{
  public static void main(String[] aa)
  {
    Frame1 f=new Frame1();
    f.setVisible(true);
  }
}

This application is built using Java in Apache NetBeans. It allows users to perform various mathematical calculations, such as arithmetic operations, age calculation, and geometric calculations (including solvers for circles, parallelograms, rectangles, rhombuses, and squares). It also includes solvers for linear and quadratic equations, statistical analysis, trigonometry, unit conversions, and calculators for weight, temperature, length, and time.

This is a simple notepad application where users can create and save text files, as well as edit them performing actions such as setting colors, cutting, copying, pasting, and finding text.

We can calculate age using this calculator; it is built in Java.

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class Frame1 extends JFrame
{
  JComboBox c1=new JComboBox();
  JComboBox c2=new JComboBox();
  JComboBox c3=new JComboBox();
  JComboBox c4=new JComboBox();
  JComboBox c5=new JComboBox();
  JComboBox c6=new JComboBox();
  JButton b1=new JButton("OK");
  JLabel l1=new JLabel("Age:");
Frame1()
{
  setSize(700,550);
  setDefaultCloseOperation(3);
  setLayout(null);
  c1.setBounds(20,20,150,40);add(c1);
  for(int i=1;i<=31;i++)
  {
     c1.addItem(i);

  }
  c2.setBounds(180,20,150,40);add(c2);
  for(int i=1;i<=12;i++)
  {
     c2.addItem(i);

  }
  c3.setBounds(340,20,150,40);add(c3);
  for(int i=1960;i<=2040;i++)
  {
     c3.addItem(i);

  }
  c4.setBounds(20,150,150,40);add(c4);
  for(int i=1;i<=31;i++)
  {
     c4.addItem(i);

  }
  c5.setBounds(180,150,150,40);add(c5);
  for(int i=1;i<=12;i++)
  {
     c5.addItem(i);

  }
  c6.setBounds(340,150,150,40);add(c6);
  for(int i=1960;i<=2040;i++)
  {
     c6.addItem(i);

  }
  b1.setBounds(500,150,150,40);add(b1);
  l1.setBounds(20,270,400,40);add(l1);
  l1.setFont(new Font("Arial",1,30));
  b1.addActionListener(new ActionListener()
  {
    public void actionPerformed(ActionEvent e)
    {
        f1();

    }
   });

}
   void f1()
   { 
      int d1=Integer.parseInt(c1.getSelectedItem()+"");
      int m1=Integer.parseInt(c2.getSelectedItem()+"");
      int y1=Integer.parseInt(c3.getSelectedItem()+"");
      int d2=Integer.parseInt(c4.getSelectedItem()+"");
      int m2=Integer.parseInt(c5.getSelectedItem()+"");
      int y2=Integer.parseInt(c6.getSelectedItem()+"");
      int d=d1-d2;
      int m=m1-m2;
      int y=y1-y2;
      if(d<0)
      {
         d=d+30;
         m--;
      }
      if(m<0)
      {
         m=m+12;
         y--;
      }
      l1.setText(y+"Years "+m+" Month "+d+" Days");  
 
   }




}
class AgeCalculator
{
  public static void main(String[] aa)
  {
     Frame1 f=new Frame1();
     f.setVisible(true);
  }
}
                               

The user can create a wide variety of colors by combining red, green, and blue.

We can convert temperature units for example, changing Celsius to Fahrenheit or Kelvin.

We can add items or text to the combo box and then select items from it.

The user will enter a string, and the number of words and characters in it will be calculated.

import java.io.*;
import java.util.*;
import java.text.*;
class PrintNumberOfWordss
{
   public static void main(String[] aa)
   {
	   try
	   {
		   Scanner sc=new Scanner(System.in);
		   System.out.println("Enter a string");
		   String s=sc.nextLine();
		   String[] arr=s.split(" ");
		   System.out.println("Total Words : "+arr.length);
		   System.out.println("Total Characters : "+s.length());
	        
	   }
	   catch(Exception ee)
	   {
		   System.out.println("Enter Only a String");
	   }
   }
}

The user will enter an integer, and its multiplication table will be printed.

import java.io.*;
import java.util.*;
public class PrintNumberTable 
{
  public static void main(String[] args) 
  {
	  try
	  {
	     Scanner sc=new Scanner(System.in);
	     System.out.println("Enter a Number");
	     int n=sc.nextInt();
    int i = 1;
    do 
	{
      System.out.println(i*n);
      i++;
    }
    while (i <= 10);
      }
      catch(Exception ee)
      {
		  System.out.println("Please Enter Only a Number");
	  }	  
  }
}