JavaPrograms-And-HackerRank-Solutions/AEvent.java at master · piyushkamalanand/JavaPrograms-And-HackerRank-Solutions · GitHub

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package practicetime;
import java.util.Scanner;
import java.awt.*;
import java.awt.event.*;
public class AEvent extends Frame implements ActionListener{
TextField tf,tf1,tf2;
Button b,b1,b2,b3;
Label l1,l2,l3,l4;
AEvent(){
	l4=new Label(" Calculator ");
	l4.setBounds(100,50,170,20);
	l1=new Label(" First Number - ");
	l1.setBounds(10,100,170,20);
tf=new TextField();
tf.setBounds(180,100,170,20);
l2=new Label(" Second Number - ");
l2.setBounds(10,150,170,20);
tf1=new TextField();
tf1.setBounds(180,150,170,20);
l3=new Label(" Result - ");
l3.setBounds(10,200,170,20);
tf2=new TextField();
tf2.setBounds(180,200,170,20);
 b=new Button("ADD");
 b.setBounds(220,250,80,30);
 b1=new Button("SUBSTRACT");
 b1.setBounds(220,300,80,30);
 b2=new Button("MULTIPLY");
 b2.setBounds(220,350,80,30);
 b3=new Button("DIVISION");
b3.setBounds(220,400,80,30);
//register listener
b.addActionListener(this);//passing current instance
b1.addActionListener(this);
b2.addActionListener(this);
b3.addActionListener(this);
//add components and set size, layout and visibility
add(b);add(b1);add(b2);add(b3);add(l1);add(l2);add(l3);add(l4);
add(tf);add(tf1);add(tf2);
setSize(300,300);
setLayout(null);
setVisible(true);
}
public void actionPerformed(ActionEvent e){
	String s1=tf.getText();
	String s2=tf1.getText();
	double a=Double.parseDouble(s1);
    double a1=Double.parseDouble(s2);
    double c=0;
    if(e.getSource()==b){
        c=a+a1;
    }else if(e.getSource()==b1){
        c=a-a1;
    }
    else if(e.getSource()==b2){
        c=a*a1;
    }
    else if(e.getSource()==b3){
        c=a/a1;
    }
    String result=String.valueOf(c);
    tf2.setText(result);
}
public static void main(String args[]){
new AEvent();
}
}