employeetest.java

一些java的小程序.包括排序,一些bank的小计算,

/*===========================================================================

	PLEASE NOTE!!!  Do not edit any of this support code.  Please 
	scroll down to see the code you need to edit for this lab.

===========================================================================*/

import java.awt.*;
import java.awt.event.*;

public class EmployeeTest extends Panel implements ActionListener, ItemListener
{
	private java.util.Vector employees = new java.util.Vector();

	// GUI Components
	private List employeeList = new List();
	private Label nameLabel = new Label("Name:");
	private Label ageLabel = new Label("Age:");
	private TextField nameField = new TextField();
	private TextField ageField = new TextField();
	private Button addButton = new Button("Add Employee");
	private Button modifyButton = new Button("Modify Employee");
	private Button incButton = new Button("Inc Age");
	private Button decButton = new Button("Dec Age");

	public EmployeeTest()
	{
		setLayout(null);
		setupGUI();
	}

	private void setupGUI()
	{
		setupEdit();
		setupList();
	}

	private void setupEdit()
	{
		add(nameLabel);
		add(nameField);
		add(ageLabel);
		add(ageField);
		add(addButton);
		add(modifyButton);

		nameLabel.setSize(50,24);
		nameLabel.setLocation(20,20);
		nameField.setSize(150,24);
		nameField.setLocation(75,20);

		ageLabel.setSize(50,24);
		ageLabel.setLocation(20,50);
		ageField.setSize(50,24);
		ageField.setLocation(75,50);

		addButton.setSize(120,24);
		addButton.setLocation(20,80);
		addButton.addActionListener(this);

		modifyButton.setSize(150,24);
		modifyButton.setLocation(150,80);
		modifyButton.setEnabled(false);
		modifyButton.addActionListener(this);
	}

	private void setupList()
	{
		add(employeeList);
		add(incButton);
		add(decButton);

		employeeList.setSize(200,100);
		employeeList.setLocation(20,140);
		employeeList.addItemListener(this);

		incButton.setSize(100,24);
		incButton.setLocation(20,250);
		incButton.setEnabled(false);
		incButton.addActionListener(this);

		decButton.setSize(100,24);
		decButton.setLocation(130,250);
		decButton.setEnabled(false);
		decButton.addActionListener(this);
	}

	public void actionPerformed(ActionEvent e)
	{
		if (e.getSource()==addButton)
		{
			Employee anEmployee = setupEmployee(nameField.getText(), 
						Integer.parseInt(ageField.getText()));

			String displayString = setupDisplayString(anEmployee);
			employeeList.add(displayString);
			employees.addElement(anEmployee);
			clearFields();
		}
		else
		if (e.getSource()==modifyButton)
		{
			int index = employeeList.getSelectedIndex();
			Employee anEmployee = (Employee) employees.elementAt(index);
			updateEmployee(anEmployee, nameField.getText(), 
					Integer.parseInt(ageField.getText()));
			String displayString = setupDisplayString(anEmployee);
			employeeList.replaceItem(displayString, index);
			employeeList.select(index);
		}
		else
		if (e.getSource()==incButton)
		{
			int index = employeeList.getSelectedIndex();
			Employee anEmployee = (Employee) employees.elementAt(index);
			incEmployee(anEmployee);
			String displayString = setupDisplayString(anEmployee);
			employeeList.replaceItem(displayString, index);
			employeeList.select(index);
		}
		else
		if (e.getSource()==decButton)
		{
			int index = employeeList.getSelectedIndex();
			Employee anEmployee = (Employee) employees.elementAt(index);
			decEmployee(anEmployee);
			String displayString = setupDisplayString(anEmployee);
			employeeList.replaceItem(displayString, index);
			employeeList.select(index);
		}
	}

	public void itemStateChanged(ItemEvent e)
	{
		int index = employeeList.getSelectedIndex();
		if (index >= 0)
		{
			Employee anEmployee = (Employee) employees.elementAt(index);
			nameField.setText(anEmployee.getName());
			ageField.setText(" " + anEmployee.getAge());

			incButton.setEnabled(true);
			decButton.setEnabled(true);
			modifyButton.setEnabled(true);
		}
		else
		{
			clearFields();
			incButton.setEnabled(false);
			decButton.setEnabled(false);
			modifyButton.setEnabled(false);
		}
	}

	private void clearFields()
	{
		nameField.setText("");
		ageField.setText("");
	}

	public static void main(String[] args)
	{
		Frame aFrame = new Frame("EmployeeTest");
		aFrame.setSize(320,300);
		aFrame.setLocation(100,100);

		EmployeeTest aTest = new EmployeeTest();
		aFrame.add(aTest);
		aFrame.setVisible(true);
	}

/*===========================================================================

	DO NOT EDIT ABOVE THIS LINE.  However, you can look to see if you can 
	understand what the support code does.

	Fill in the methods below.

===========================================================================*/


// When the "Add" button is pressed, this method is invoked.  It is passed 
// the name and the age as entered in GUI.  This method must create a new
// instance of employee using the supplied values.  The newly created employee
// object is then to be returned.

	public Employee setupEmployee(String aName, int anAge)
	{
		// Create a new Instance of Employee.  Initialize it with the name and
		// age supplied.
		Employee temp = new Employee(aName,anAge);

		// Return the newly created employee object;
		return temp;

	}

// This method is invoked every time an employee object must be displayed in
// the list.  This method should create a display string using the data
// obtained from the employee object parameter.

	public String setupDisplayString(Employee anEmployee)
	{
		// Create a string and assign the display text to it.  The display text
		// should be created using data supplied by the employee object passed into
		// this method.
		
		String info = "Name = " + anEmployee.getName() 
			+ "," + "age = " + anEmployee.getAge()  + ";";
		
		return info;

	}

// This method is invoked every time the modify employee button is pressed.
// This method must replace the values of the employee parameter with the 
// values passed to the method.

	public void updateEmployee(Employee anEmployee, String aNewName, int aNewAge)
	{
		// Update the name of the employee
			anEmployee.setName(aNewName);
			
		// Update the age of the employee
			anEmployee.setAge(aNewAge);
	}

// This method is invoked when the "Increment age" Button is pressed.  You must
// increment the age of the employee object passed as a parameter

	public void incEmployee(Employee anEmployee)
	{
		// Increment the age of the employee
		anEmployee.incAge();
	}

// This method is invoked when the "Decrement age" Button is pressed.  You must
// decrement the age of the employee object passed as a parameter

	public void decEmployee(Employee anEmployee)
	{
		// Decrement the age of the employee
		anEmployee.decAge();
	}

}