Find any errors in each of the following lines of code, and explain how to corre

Question

Find any errors in each of the following lines of code, and explain how to correct them 1. import java.swing.JFrame //import JFrame 2. container.add(okButton, WEST); //add OkButton to BorderLayout's West region 3 container.setLayout(new FlowLayout(FlowLayout.DEFAULT); I/set up to FlowLayout's default aslignment 4. JLabel firstLabel, JLabel; //create two references of JLabel 5. objectokButton JButton("Ok") 6. catch (NumberFormatException n, ArithmeticException e) //handle two exceptions inside one catch block 7·JTextArea ttArea-new JTextArea(20, 5); /create a textarea with 20 columns and 5 rows 8. The following is an inner class that will be registered as an action listener for a JButton component: private class ButtonListener public void actionPerformedot //code appears here)

Explanation / Answer

1. import java.swing.JFrame // import JFrame Answer : Jframe does't exist into the java.swing package but this is in javax.swing package Correct : import javax.swing.JFrame; 2. container.add(okButton, WEST) // ok button to burder layout Answer : Error in WEST there is should be an index or object if we want to use layout then it should be like container.add(okButton, BorderLayout.WEST); otherwise Correct syntex : container.add(Component comp, int index) 3. container.setLayout(new FlowLayout(FlowLayout.RIGHT)); // set up to default Answer : Error in Flowlayout.RIGHT there is no such variable in flowlayout. Variables in Flowlayout : public static final int LEFT public static final int RIGHT public static final int CENTER public static final int LEADING public static final int TRAILING foe example : container.setLayout(new FlowLayout(FlowLayout.RIGHT)); 4. JLabel firstLAbel,JLabel // create two instances Answer : Error in creating instance in JLabel because this is name of class. This should not as class name. So use Jlabell firstLabel,jlabel; 5. objectokButton = JButton("Ok") Answer : Button is creating using new keyword. Correct : objectokButton = new JButton("Ok"); 6. catch(NumberFormatException n, ArithmeticException e) // handle two exceptions Answer : Syntex error in catching two exception. Correct : catch(NumberFormatException | ArithmeticException e) 7. JTextArea tstArea = new JTextArea(10,5); //create textarea with 20 col 5 row Answewr: Wrong paramerters pass first parameter is row second is columns Correct : JTextArea tstArea = new JTextArea(5,10); 8. Error in method. actionPerformed method should have an ActionEvent class object. Correct : private class ButtonListner implements ActionListener { public void actionPerformed(ActionEvent e) { // code } }

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