how to instantiate an obect - ?
I have a class LinkedStack (see first code snippet) but when I try to call the method to push an object onto it netbeans keeps telling me it cannot find the method?
Tks,
Owen.
Tks,
Owen.
public class LinkedStack
{
private node top;
private int size;
public LinkedStack()
{
top = null;
size = 0;
}
public int size()
{
return size;
}
public boolean isEmpty()
{
if(top == null)
return true;
else return false;
}
public Object top() throws StackException
{if (isEmpty())
throw new StackException("Stack is empty");
return top.getElement();
}
public void push(Object obj)
{
node n = new node();
n.setElement(obj);
n.setNext(top);
top = n;
size++;
}
#####################
public class linkQueue extends javax.swing.JFrame {
public linkQueue() {
initComponents();
}
/** This method is called from within the constructor to
* initialize the form.
* WARNING: Do NOT modify this code. The content of this method is
* always regenerated by the Form Editor.
*/
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jLabel1 = new javax.swing.JLabel();
jLabel2 = new javax.swing.JLabel();
jLabel3 = new javax.swing.JLabel();
jLabel4 = new javax.swing.JLabel();
empNumTextField = new javax.swing.JTextField();
empFirstNameTextField = new javax.swing.JTextField();
empLastNameTextField = new javax.swing.JTextField();
empAgeTextField = new javax.swing.JTextField();
jScrollPane1 = new javax.swing.JScrollPane();
jTextArea1 = new javax.swing.JTextArea();
insertButton = new javax.swing.JButton();
deleteButton = new javax.swing.JButton();
searchButton = new javax.swing.JButton();
qSizeButton = new javax.swing.JButton();
frontButton = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jLabel1.setFont(new java.awt.Font("Tahoma", 1, 12));
jLabel1.setText("Emp Number:");
jLabel2.setFont(new java.awt.Font("Tahoma", 1, 12));
jLabel2.setText("First Name:");
jLabel3.setFont(new java.awt.Font("Tahoma", 1, 12));
jLabel3.setText("Last Name:");
jLabel4.setFont(new java.awt.Font("Tahoma", 1, 12));
jLabel4.setText("Age:");
empNumTextField.setFont(new java.awt.Font("Tahoma", 1, 12)); // NOI18N
empFirstNameTextField.setFont(new java.awt.Font("Tahoma", 1, 12));
empLastNameTextField.setFont(new java.awt.Font("Tahoma", 1, 12));
empAgeTextField.setFont(new java.awt.Font("Tahoma", 1, 12));
jTextArea1.setColumns(20);
jTextArea1.setRows(5);
jScrollPane1.setViewportView(jTextArea1);
insertButton.setLabel("Insert");
insertButton.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
insertButtonActionPerformed(evt);
}
});
deleteButton.setText("Delete");
searchButton.setText("Search");
qSizeButton.setText("Q Size");
frontButton.setText("Front");
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
.addComponent(jScrollPane1, javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.LEADING, layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jLabel1)
.addComponent(jLabel2)
.addComponent(jLabel3)
.addComponent(jLabel4))
.addGap(91, 91, 91)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addComponent(empAgeTextField)
.addComponent(empLastNameTextField)
.addComponent(empFirstNameTextField)
.addComponent(empNumTextField, javax.swing.GroupLayout.DEFAULT_SIZE, 242, Short.MAX_VALUE))))
.addGroup(layout.createSequentialGroup()
.addComponent(insertButton, javax.swing.GroupLayout.PREFERRED_SIZE, 61, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(deleteButton)
.addGap(15, 15, 15)
.addComponent(searchButton)
.addGap(15, 15, 15)
.addComponent(qSizeButton, javax.swing.GroupLayout.PREFERRED_SIZE, 63, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addComponent(frontButton, javax.swing.GroupLayout.PREFERRED_SIZE, 61, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel1)
.addComponent(empNumTextField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel2)
.addComponent(empFirstNameTextField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel3)
.addComponent(empLastNameTextField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel4)
.addComponent(empAgeTextField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(18, 18, 18)
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 277, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(insertButton)
.addComponent(deleteButton)
.addComponent(searchButton)
.addComponent(qSizeButton)
.addComponent(frontButton))
.addContainerGap(19, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
private void insertButtonActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
String inText = empFirstNameTextField.getText() + empLastNameTextField.getText() +
empNumTextField.getText() + empAgeTextField.getText();
push(inText); // error here, please help
}
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new linkQueue().setVisible(true);
LinkedStack myStack = new LinkedStack();
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton deleteButton;
private javax.swing.JTextField empAgeTextField;
private javax.swing.JTextField empFirstNameTextField;
private javax.swing.JTextField empLastNameTextField;
private javax.swing.JTextField empNumTextField;
private javax.swing.JButton frontButton;
private javax.swing.JButton insertButton;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private javax.swing.JLabel jLabel4;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JTextArea jTextArea1;
private javax.swing.JButton qSizeButton;
private javax.swing.JButton searchButton;
// End of variables declaration
SOLUTION
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ASKER CERTIFIED SOLUTION
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ASKER
Figured out my second problem, I allowed netbeans to refactor when I moved all source files to the same directory. Tks for help.
ASKER
Thank you,
Owen.
stacks-EE.JPG