calculator in java with actionListener and KeyListener
//Calculator.java import java.awt.*; import java.awt.event.*; class CalculatorDemo extends Frame implements ActionListener,KeyListener { Panel p1,p2; Label lblR; Button btn7,btn8,btn9,btnA,btn4,btn5,btn6,btnS,btn1,btn2,btn3,btnM,btn0,btnC,btnE,btnD; double x=0.0,y=0.0,z=0.0; int op=0; public CalculatorDemo() { super("Calculator Demo"); addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent we) { System.exit(0); } } ); setSize(300,500); setResizable(false); setBounds((1366/2)-(300/2),(768/2)-(500/2),300,500); p1=new Panel(); p2=new Panel(); p1.setFont(new Font("Serif",Font.PLAIN,50)); p2.setFont(new Font("Serif",Font.BOLD,30)); lblR=new Label("0",Label.RIGHT); btn7=new Button("7"); btn8=new Button("8"); btn9=new Button("9"); btnA=new Button("+"); ...