import java.awt.*;
import java.applet.*;
import java.awt.event.*;
public class Calculator extends Applet implements ActionListener
{
String s,ans=" ",str=" ";
TextField Text1;
int flag=0,str_length;
Button Button1,Button2,Button3,Button4,Button5,Button6,Button7,Button8,Button9,Button0;
Button ButtonClr,ButtonEql,ButtonPlus,ButtonMinus, ButtonMul,ButtonPoint,ButtonDiv,ButtonBck;
Color BackColor;
public void init()
{
Text1=new TextField(10); add(Text1);
Button1=new Button("1"); add(Button1); Button1.addActionListener(this);
Button2=new Button("2"); add(Button2); Button2.addActionListener(this);
Button3=new Button("3"); add(Button3); Button3.addActionListener(this);
Button4=new Button("4"); add(Button4); Button4.addActionListener(this);
Button5=new Button("5"); add(Button5); Button5.addActionListener(this);
Button6=new Button("6"); add(Button6); Button6.addActionListener(this);
Button7=new Button("7"); add(Button7); Button7.addActionListener(this);
Button8=new Button("8"); &nb sp; add(Button8); Button8.addActionListener(this);
Button9=new Button("9"); add(Button9); Button9.addActionListener(this);
Button0=new Button("0"); add(Button0); Button0.addActionListener(this);
ButtonClr=new Button("CLR"); add(ButtonClr); ButtonClr.addActionListener(this);
ButtonEql=new Button("="); add(ButtonEql); ButtonEql.addActionListener(this);
ButtonPlus=new Button("+"); add(ButtonPlus); ButtonPlus.addActionListener(this);
ButtonMinus=new Button("-"); add(ButtonMinus); ButtonMinus.addActionListener(this);
ButtonMul=new Button("*"); add(ButtonMul); ButtonMul.addActionListener(this);
ButtonPoint=new Button("."); add(ButtonPoint); ButtonPoint.addActionListener(this);
ButtonDiv=new Button("/"); add(ButtonDiv); ButtonDiv.addActionListener(this);
ButtonBck=new Button("<-"); add(ButtonBck); ButtonBck.addActionListener(this);
BackColor = new Color(60,60,122);
}
public void paint(Graphics g)
{
g.setColor(BackColor);
g.fillRect(50,50,250,300);
Text1.setBounds(70,60,210,20);
Button1.setBounds(80,100,50,20);
Button2.setBounds(150,100,50,20);
Button3.setBounds(220,100,50,20);
Button4.setBounds(80,140,50,20);
Button5.setBounds(150,140,50,20);
Button6.setBounds(220,140,50,20);
Button7.setBounds(80,180,50,20);
Button8.setBounds(150,180, 50,20);
Button9.setBounds(220,180,50,20);
Button0.setBounds(80,220,50,20);
ButtonClr.setBounds(150,220,50,20);
ButtonEql.setBounds(220,220,50,20);
ButtonPlus.setBounds(80,260,50,20);
ButtonMinus.setBounds(150,260,50,20);
ButtonMul.setBounds(220,260,50,20);
ButtonPoint.setBounds(80,300,50,20);
ButtonDiv.setBounds(150,300,50,20);
ButtonBck.setBounds(220,300,50,20);
}
public void actionPerformed(ActionEvent evt)
{
s=Text1.getText();
if(evt.getSource()==Button1){
addChar(s,"1");
}
else if(evt.getSource()==Button2){
addChar(s,"2");
}
else if(evt.getSource()==Button3){
addChar(s,"3");
}
else if(evt.getSource()==Button4){
addChar(s,"4");
}
else if(evt.getSource()==Button5){
addChar(s,"5");
}
else if(evt.getSource()==Button6){
addChar(s,"6");
}
else if(evt.getSource()==Button7){
addChar(s,"7");
}
else if(evt.getSource()==Button8){
addChar(s,"8");
}
else if(evt.getSource()==Button9){
addChar(s,"9");
}
else if(evt.getSource()==Button0){
addChar(s,"0");
}
else if(evt.getSource()==ButtonClr){
Text1.setText(" ");
}
else if(evt.getSource()==ButtonPlus){
addChar(s,"+");
flag=1;
}
else if(evt.getSource()==ButtonMinus){
addChar(s,"-");
flag=2;
}
else if(evt.getSource()==ButtonMul){
addChar(s,"*");
flag=3;
}
else if(evt.getSource()==ButtonPoint){
addChar(s,".");
}
else if(evt.getSource()==ButtonDiv){
addChar(s,"/");
flag=4;
}
else if(evt.getSource()==ButtonBck){
deleteChar(s);
}
else if(evt.getSource()==ButtonEql){
if(flag==1)
get_String(flag);
if(flag==2)
get_String(flag);
if(flag==3)
get_String(flag);
if( flag==4);
get_String(flag);
}
}
public void addChar(String input, String character)
{
if(String.valueOf(input)==null)
character=String.valueOf(input);
else{
input+=character;
Text1.setText(input);
}
}
public void get_String( int cnt)
{
String y=" ",x=" ";
char operator;
int i,j,count=0;
str=Text1.getText();
str_length=str.length();
if(cnt==1)
{
count=str.indexOf("+");
}
else if(cnt==2)
{
count=str.indexOf("-");
}
else if(cnt==3)
{
count=str.indexOf("*");
}
else if(cnt==4)
{
count=str.indexOf("/");
}
try
{
operator=str.charAt(count);
x=str.substring(0,count);
y=str.substring(count+1,str_length);
compute(operator,x,y);
}
catch(Exception e){}
}
public void compute(char op,String val1,String val2)
{
Double value1=0.0,value2=0.0,tmp_ans=0.0;
value1=Double.parseDouble(val1);
value2=Double.parseDouble(val2);
if(op=='+') tmp_ans=value1+value2;
if(op=='-') tmp_ans=value1-value2;
if(op=='*') tmp_ans=value1*value2;
if(op=='/') tmp_ans=value1/value2;
ans=String.valueOf(tmp_ans);
Text1.setText(ans);
}
public void deleteChar( String str)
{
String tmp_str="";
str_length=str.length();
tmp_str=str.substring(0,str_length-1);
Text1.setText(tmp_str);
}
}
Calculator in Java including UI
Calucator in Java would be cool stuff to make by programming. Leanr How to make Cluculator in java now. Follow the code below.
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