little error in java code

by sharmila farooqi Sun May 29, 2011 5:03 pm

Code:: import java.awt.*; import javax.swing.*; import java.awt.event.*; public class SmallCalcApp implements ActionListener{ JFrame frame; JLabel firstOperand, secondOperand, answer; JTextField op1, op2, ans; JButton plus, mul; public void initGUI(){ frame = new JFrame(); firstOperand = new JLabel("First Operand"); secondOperand = new JLabel ("Second Operand"); answer = new JLabel ("Answer"); op1 = new JTextField (15); op2 = new JTextField (15); ans = new JTextField (15); mul = new JButton ("*"); mul.setPreferredSize(new Dimension(70,25)); plus = new JButton ("+"); plus.setPreferredSize(new Dimension(70,25)); Container con = frame.getContentPane(); con.setLayout(new FlowLayout()); con.add(firstOperand); con.add(op1); con.add(secondOperand); con.add(op2); con.add(plus); con.add(ans); plus.addActionListener(this); mul.addActionListener(this); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOS E); frame.setSize(200,220); frame.setVisible(true); } public SmallCalcApp(){ initGUI(); } public void actionPerformed(ActionEvent event){ String oper, result; int num1, num2, res; if (event.getSource() == plus){ oper = op1.getText(); num1 = Integer.parseInt(oper); oper = op2.getText(); num2 = Integer.parseInt(oper); res = num1 + num2 ; result = res + ""; ans.setText(result); } else if (event.getSource() == mul){ oper = op1.getText(); num1 = Integer.parseInt(oper); oper = op2.getText(); num2 = Integer.parseInt(oper); res = num1 * num2; result = res + ""; ans.setText(result); } } public static void main (String args[]){ SmallCalcApp scApp = new SmallCalcApp(); } }

by Vuhelper Sun May 29, 2011 5:04 pm

Code:: Add the multiplication button as well using statement. con.add(mul); Corrected Code as below import java.awt.*; import javax.swing.*; import java.awt.event.*; public class SmallCalcApp implements ActionListener{ JFrame frame; JLabel firstOperand, secondOperand, answer; JTextField op1, op2, ans; JButton plus, mul; public void initGUI(){ frame = new JFrame(); firstOperand = new JLabel("First Operand"); secondOperand = new JLabel ("Second Operand"); answer = new JLabel ("Answer"); op1 = new JTextField (15); op2 = new JTextField (15); ans = new JTextField (15); mul = new JButton ("*"); mul.setPreferredSize(new Dimension(70,25)); plus = new JButton ("+"); plus.setPreferredSize(new Dimension(70,25)); Container con = frame.getContentPane(); con.setLayout(new FlowLayout()); con.add(firstOperand); con.add(op1); con.add(secondOperand); con.add(op2); con.add(mul); /*Add the multiplication button to container as well*/ con.add(plus); con.add(ans); plus.addActionListener(this); mul.addActionListener(this); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(200,220); frame.setVisible(true); } public SmallCalcApp(){ initGUI(); } public void actionPerformed(ActionEvent event){ String oper, result; int num1, num2, res; if (event.getSource() == plus){ oper = op1.getText(); num1 = Integer.parseInt(oper); oper = op2.getText(); num2 = Integer.parseInt(oper); res = num1 + num2 ; result = res + ""; ans.setText(result); } else if (event.getSource() == mul){ oper = op1.getText(); num1 = Integer.parseInt(oper); oper = op2.getText(); num2 = Integer.parseInt(oper); res = num1 * num2; result = res + ""; ans.setText(result); } } public static void main (String args[]){ SmallCalcApp scApp = new SmallCalcApp(); }

little error in java code

little error in java code

Re: little error in java code