我在通过窗口自己的cmd编译时遇到问题。
现在我得到的问题如下：
Note: ApplicationCentre.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
当我使用它编译时，我收到以下错误：
ApplicationCentre.java:7: warning: [deprecation] JApplet in javax.swing has been deprecated
public class ApplicationCentre extends JApplet implements ActionListener{
我的所有文件都在一个文件夹名称中：applicationCentre 该文件夹包含：ApplicationCentre.java和ApplicationCentre.html
代码发布在下面：
import java.awt.event.*;
import java.util.ArrayList;
import java.awt.*;
import javax.swing.*;
@SuppressWarnings("serial")
public class ApplicationCentre extends JApplet implements ActionListener{
private static final long serialVersionUID = 1L;
public ApplicationCentre() {
}
JTextField t1,t2;
JLabel l3,l4;
JButton b1,b2,b3,b4;
String best = "";
Student stu[];
JScrollPane listScrollPane = new JScrollPane();
String[] uni = {"Toronto","York","Western","Brock","Guelph","Waterloo","McGill","Concordia","Laval","Macmaster"};
JList<?> uniList = new JList<Object>(uni);
CardLayout cardManager = new CardLayout();
JPanel cards = new JPanel(cardManager);
int count = 0;
Object[] values;
String userName;
int avgMark;
ArrayList<String> nameList = new ArrayList<String>();
ArrayList<String> markList = new ArrayList<String>();
public void init() {
//Added Buttons
stu = new Student[20];
Container c = this.getContentPane();
JPanel p1 = new JPanel();
b1 = new JButton("Input");
b2 = new JButton("Display All");
b3 = new JButton("Search");
b1.addActionListener(this);
b2.addActionListener(this);
b3.addActionListener(this);
p1.setLayout(new GridLayout(3,1));
p1.add(b1);
p1.add(b2);
p1.add(b3);
c.add(p1, BorderLayout.WEST);
//Added Labels, TextFields and JList
JPanel p2 = new JPanel();
JLabel l1 = new JLabel("Enter Students Name. ");
t1 = new JTextField();
JLabel l2 = new JLabel("Enter Average Mark. ");
t2 = new JTextField();
JLabel l3 = new JLabel("From the List below choose 3 universities. ");
uniList.setVisibleRowCount(2);
listScrollPane.setViewportView(uniList);
b4 = new JButton("Submit");
p2.setLayout(new GridLayout(0,1));
p2.add(l1);
p2.add(t1);
p2.add(l2);
p2.add(t2);
p2.add(l3);
p2.add(listScrollPane);
p2.add(b4);
c.add(p2, BorderLayout.EAST);
b4.addActionListener(this);
}
public void actionPerformed(ActionEvent e) {
userName = t1.getText();
avgMark = Integer.parseInt(t2.getText());
values = uniList.getSelectedValuesList().toArray();
if(e.getSource()==b4) {
t1.setText(" ");
t2.setText(" ");
System.out.println(userName);
System.out.println(avgMark);
System.out.println(values);
}
}
}
class Student {
private String name;
private int mark;
protected String universityOne;
protected String universityTwo;
protected String universityThree;
protected boolean universityOneAccept;
protected boolean universityTwoAccept;
protected boolean universityThreeAccept;
public Student(String n, int m) {
name = n;
mark = m;
this.universityOneAccept = false;
this.universityTwoAccept = false;
this.universityThreeAccept = false;
}
public void addUniversity(String name) {
//When a university is added it doesn't mean that the user has
//accepted. So I set it to false.
this.addUniversity(name,false);
}
public void addUniversity(String name, boolean isAccepted) {
//If the user does happen to selected one university then set the isAccepted to true.
//If the user selected more than 3 universities by chance then show the message "You have chosen over 3 universities.".
if((this.universityOne == null) || (this.universityOne.equals(name))){
this.universityOne = name;
this.universityOneAccept = isAccepted;
} else if ((this.universityTwo == null) || (this.universityTwo.equals(name))) {
this.universityTwo = name;
this.universityTwoAccept = isAccepted;
} else if ((this.universityThree == null) || (this.universityThree.equals(name))) {
this.universityThree = name;
this.universityThreeAccept = isAccepted;
} else {
throw new RuntimeException("You have chosen over 3 universities.");
}
}
//Getting the marks and the name of the user and setting them.
public String getName() {
return name;
}
public int getMark() {
return mark;
}
public void setName(String name) {
this.name = name;
}
public void setMark(int mark) {
this.mark = mark;
}
//The toString() method that will print what the user's name, mark and universities chosen
//The if statements will determine whether the user has accepted or rejected.
//The ? is pretty much the alternative of the if-else statement which i learned in high-school and off internet.
//It was just easy and simple to use.
//The : tells the computer to use the value if the condition is false
//The ? tells the computer to use the value if the condition is true.
public String toString() {
String result = "Student [name=" + getName() + ",mark=" + getMark() +",universities=[";
if(this.universityOne !=null)
result += this.universityOne + ":" + (this.universityOneAccept ? "accepted" : "rejected");
if(this.universityTwo !=null)
result += this.universityTwo + ":" + (this.universityTwoAccept ? "accepted" : "rejected");
if(this.universityThree !=null)
result += this.universityThree + ":" + (this.universityThreeAccept ? "accepted" : "rejected");
result += "]]";
return result;
}
}
HTML代码：
<html>
<applet CODE="ApplicationCentre.class" width=700 height=500>
</applet>
</html>
我知道错误发生在第7行，但我不知道如何修复它。