成绩输入查询排序(JAVA).docVIP

public class Student { public String xh; public int cj; public String num; public double score; } import java.awt.*; import java.awt.event.*; import java.util.*; public class Stu extends Frame implements ActionListener { private Button sr=new Button(成绩输入); private Button cx=new Button(成绩查询); private Button px=new Button(成绩排序); private Label xh=new Label(学号); private Label chj=new Label(成绩); private TextField XH=new TextField(); private TextField CHJ=new TextField(); private TextArea xs=new TextArea(); public Vector v=new Vector(); private class WindowCloser extends WindowAdapter { public void windowclosing(WindowEvent we) { System.exit(0); } } private void setup() { Panel buttons=new Panel(); buttons.setLayout(new FlowLayout()); buttons.add(sr);buttons.add(cx);buttons.add(px); Panel input1=new Panel(); input1.setLayout(new BorderLayout()); input1.add(West,xh);input1.add(Center,XH); Panel input2=new Panel(); input2.add(West,chj);input2.add(Center,CHJ); Panel top=new Panel(); top.setLayout(new GridLayout(2,1)); top.add(input1);top.add(input2); setLayout(new BorderLayout()); add(Center,xs);add(North,top);add(South,buttons); } public Stu() { super(成绩事项); setup(); sr.addActionListener(this); cx.addActionListener(this); px.addActionListener(this); addWindowListener(new WindowCloser()); pack(); setVisible(true); } public void actionPerformed(ActionEvent e) { if(e.getSource() == sr) { xs.append(XH.getText()); xs.append(\n + CHJ.getText()); } } public void sr() { Student s=new Student(); s.num=XH.getText(); s.score=Double.parseDouble(CHJ.getText()); v.add(s); } public void cx() { for(int i=0;;i++) { Student s=(Student) v.get(i); if (s == null) { break; } else { CHJ.setText(+s.score); break; } } } public void px() { for(int i=0;;i++) { int k=i; Student s=(Student) v.get(k); for(int j=i+1;;j++) { St