/** ** Constructor. Sets up user interface and initializations */ public Secondtry() { operators = true; doClear = false; frame = new JFrame("Calculator"); frame.setLayout(new BorderLayout(10, 10)); display = new JTextArea(); display.setSize(245, 100); display.setFont(new Font("SansSerif", Font.BOLD, 28)); display.setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT); // create the numeric buttons for calculator for (int i = 0; i < 10; i++) { jb[i] = new JButton("" + (i)); jb[i].addActionListener(this); jb[i].setFont(new Font("SansSerif", Font.BOLD, 14)); } // create the square root button root = new JButton("\u221A"); root.addActionListener(this); root.setFont(new Font("SansSerif", Font.BOLD, 14)); // create the clear button clear = new JButton("C"); clear.addActionListener(this); clear.setFont(new Font("SansSerif", Font.BOLD, 14)); // create the plus button plus = new JButton("\u002B"); plus.addActionListener(this); plus.setFont(new Font("SansSerif", Font.BOLD, 14)); // create the minus button minus = new JButton("\u002D"); minus.addActionListener(this); minus.setFont(new Font("SansSerif", Font.BOLD, 14)); // create the multiply button mult = new JButton("\u002A"); mult.addActionListener(this); mult.setFont(new Font("SansSerif", Font.BOLD, 14)); // create the division button div = new JButton("\u002F"); div.addActionListener(this); div.setFont(new Font("SansSerif", Font.BOLD, 14)); // create the equals button equals = new JButton("\u003D"); equals.addActionListener(this); equals.setFont(new Font("SansSerif", Font.BOLD, 14)); equals.setPreferredSize(new Dimension(50, 60)); // create the point button point = new JButton("\u002E"); point.addActionListener(this); point.setFont(new Font("SansSerif", Font.BOLD, 14)); // button grid JPanel buttons = new JPanel(new GridLayout(5, 4, 4, 4)); // add buttons to grid buttons.add(clear); buttons.add(root); buttons.add(div); buttons.add(mult); // add numeric buttons to grid for (int i = 7; i < 10; i++) buttons.add(jb[i]); buttons.add(minus); // add numeric buttons to grid for (int i = 4; i < 7; i++) buttons.add(jb[i]); buttons.add(plus); // add numeric buttons to grid for (int i = 1; i < 4; i++) buttons.add(jb[i]); buttons.add(equals); buttons.add(jb[0]); buttons.add(point); frame.add(display, BorderLayout.CENTER); frame.add(buttons, BorderLayout.SOUTH); frame.setSize(300, 400); frame.setVisible(true); frame.setResizable(false); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); }