重写package shiyan4_3; import java.awt.; import java.awt.event.; import java.util.; import javax.swing.; public class StudentFrame extends JFrame implements ActionListener { JTextArea showArea; JTextField inputName,inputScore; JButton button; TreeSet<Student> treeSet; StudentFrame() { treeSet = new TreeSet<Student>(); showArea=new JTextArea(); showArea.setFont(new Font("",Font.BOLD,20)); inputName=new JTextField(5); inputScore=new JTextField(5); button=new JButton("确定"); button.addActionListener(this); JPanel pNorth=new JPanel(); pNorth.add(new JLabel("Name:")); pNorth.add(inputName); pNorth.add(new JLabel("Score:")); pNorth.add(inputScore); pNorth.add(button); add(pNorth,BorderLayout.NORTH); add(showArea,BorderLayout.CENTER); setSize(300,320); setVisible(true); validate(); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } public void actionPerformed(ActionEvent e) { String name=inputName.getText(); int score=0; try{ score=Integer.parseInt(inputScore.getText().trim()); if(name.length()>0) { Student stu=new Student(name,score); treeSet.add(stu); // treeSet添加stu show(treeSet); } } catch(NumberFormatException exp) { inputScore.setText("请输入数字字符"); } } public void show(TreeSet tree) { showArea.setText(null); Iterator<Student> te = tree.iterator(); //获得Iterator对象te while(te.hasNext()) { Student stu=te.next(); // te返回其中的下一个元素 showArea.append("Name:"+stu.getName()+" Score: "+stu.getScore()+"\n"); } } public static void main(String args[]) { new StudentFrame(); } }

package shiyan4_3;

import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;

public class StudentFrame extends JFrame implements ActionListener {
private JTextArea showArea;
private JTextField inputName, inputScore;
private JButton button;
private TreeSet<Student> treeSet;

public StudentFrame() {
treeSet = new TreeSet<Student>();
showArea = new JTextArea();
showArea.setFont(new Font("", Font.BOLD, 20));
inputName = new JTextField(5);
inputScore = new JTextField(5);
button = new JButton("确定");
button.addActionListener(this);

JPanel pNorth = new JPanel();
pNorth.add(new JLabel("Name:"));
pNorth.add(inputName);
pNorth.add(new JLabel("Score:"));
pNorth.add(inputScore);
pNorth.add(button);

add(pNorth, BorderLayout.NORTH);
add(showArea, BorderLayout.CENTER);

setSize(300, 320);
setVisible(true);
validate();
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}

public void actionPerformed(ActionEvent e) {
String name = inputName.getText();
int score = 0;

try {
score = Integer.parseInt(inputScore.getText().trim());
if (name.length() > 0) {
Student stu = new Student(name, score);
treeSet.add(stu);
show(treeSet);
}
} catch (NumberFormatException exp) {
inputScore.setText("请输入数字字符");
}
}

public void show(TreeSet<Student> tree) {
showArea.setText(null);
Iterator<Student> te = tree.iterator();
while (te.hasNext()) {
Student stu = te.next();
showArea.append("Name:" + stu.getName() + " Score: " + stu.getScore() + "\n");
}
}

public static void main(String args[]) {
new StudentFrame();
}
}