Today in this java programming we will learn a Java Program to Create a Calculator Using AWT Controls(Abstract Window Toolkit). This will be a basic calculator with a user interface. The AWT components we will be using are Textfields, Buttons, and labels.
As we know a simple calculator requires two fields for input and one field to show the result of the operation performed on those two operands.
Program to create Calculator in Java using AWT
Source Code:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 | import java.awt.*; import java.awt.event.*; class Calculator implements ActionListener { //Declaring Objects Frame f = new Frame("Calculator AWT"); Label l1 = new Label("First Number:"); Label l2 = new Label("Second Number:"); Label l3 = new Label("Result:"); TextField t1 = new TextField(); TextField t2 = new TextField(); TextField t3 = new TextField(); Button b1 = new Button("Add"); Button b2 = new Button("Sub"); Button b3 = new Button("Mul"); Button b4 = new Button("Div"); Button b5 = new Button("Quit"); Calculator() { //Background Color f.setBackground(Color.GRAY) ; //Giving Bounds for Labels l1.setBounds(50,100,100,20); l2.setBounds(50,140,100,20); l3.setBounds(50,180,100,20); //Giving Bounds for Labels t1.setBounds(200,100,100,20); t2.setBounds(200,140,100,20); t3.setBounds(200,180,100,20); //Giving Bounds for Labels b1.setBounds(50,230,50,20); b2.setBounds(110,230,50,20); b3.setBounds(170,230,50,20); b4.setBounds(230,230,50,20); b5.setBounds(290,230,50,20); //Add components to the frame f.add(l1); f.add(l2); f.add(l3); f.add(t1); f.add(t2); f.add(t3); f.add(b1); f.add(b2); f.add(b3); f.add(b4); f.add(b5); //Action Buttons b1.addActionListener(this); b2.addActionListener(this); b3.addActionListener(this); b4.addActionListener(this); b5.addActionListener(this); f.setLayout(null); f.setVisible(true); f.setSize(400,350); } public void actionPerformed(ActionEvent e) { int n1=Integer.parseInt(t1.getText()); int n2=Integer.parseInt(t2.getText()); //Buttons Operations if(e.getSource() == b1) { t3.setText(String.valueOf(n1+n2)); } if(e.getSource() == b2) { t3.setText(String.valueOf(n1-n2)); } if(e.getSource() == b3) { t3.setText(String.valueOf(n1*n2)); } if(e.getSource() == b4) { t3.setText(String.valueOf(n1/n2)); } if(e.getSource() == b5) { System.exit(0); } } public static void main(String args[]) { new Calculator(); } } |
Output: Save the file with .java extension and open the command prompt on that directory and run the following code.
C:\java>javac Calculator.java
C:\java>java Calculator
You will see the following result:
This is the end of the article Simple calculator program in java using AWT with output.
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