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| import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class Student{
String all;
String onescore;
void getone(){
for(int i=0;i<all.length();i++){
if(all.charAt(i)==' '){
onescore=all.substring(i, all.length());
break;
}
}
}
}
class wln extends JFrame implements ActionListener{
JLabel jlb1=new JLabel("请输入文件名及路径：");
JTextField jtf=new JTextField(20);
JButton jbt1=new JButton("打开文件"),
jbt2=new JButton("保存文件"),
jbt3=new JButton("第一个成绩按升序排序");
JTextArea jta1=new JTextArea(),
jta2=new JTextArea();
JScrollPane jsp1=new JScrollPane(jta1),
jsp2=new JScrollPane(jta2);
JPanel jpl=new JPanel(),
jpl1=new JPanel(),
jpl2=new JPanel(),
jpl3=new JPanel(),
jpl4=new JPanel();
public wln() {
jpl1.add(jlb1);
jpl1.add(jtf);
jpl2.setLayout(new GridLayout(1, 3,0,0));
jpl2.add(jbt1);
jbt1.addActionListener(this);
jpl2.add(jbt2);
jbt2.addActionListener(this);
jpl2.add(jbt3);
jbt3.addActionListener(this);
jpl3.setLayout(new GridLayout(2, 1));
jpl3.add(jpl1);
jpl3.add(jpl2);
add(jpl3,BorderLayout.NORTH);
jpl4.setLayout(new GridLayout(1, 2));
jpl4.add(jsp1);
jpl4.add(jsp2);
add(jpl4, BorderLayout.CENTER);
setTitle("学生信息");
setBounds(0,0,666,666);
setVisible(true);
setDefaultCloseOperation(EXIT_ON_CLOSE);
}
public void actionPerformed(ActionEvent e) {
Object obj=e.getSource();
if(obj==jbt1){
try{
String p=jtf.getText();
FileReader fr=new FileReader(p);
BufferedReader bfr=new BufferedReader(fr);
String s=bfr.readLine();
if(!jta1.getText().equals("")){
jta1.append("\n");
}
while(s!=null){
jta1.append(s+"\n");
s=bfr.readLine();
}
bfr.close();
fr.close();
}catch (IOException e1) {
System.out.println("文件打开失败");
}
}else if(obj==jbt2){
try{
String p=jtf.getText();
FileWriter fw=new FileWriter(p);
BufferedWriter bfw=new BufferedWriter(fw);
bfw.write(jta1.getText());
jta2.setText("保存成功");
bfw.flush();
bfw.close();
fw.close();
}catch (IOException e1) {
System.out.println("文件保存失败");
}
}else if(obj==jbt3){
try{
String p=jtf.getText();
FileReader fr=new FileReader(p);
BufferedReader bfr=new BufferedReader(fr);
String s=bfr.readLine();
Student []stu=new Student[100];
int n=0;
while(s!=null){
stu[n]=new Student();
stu[n].all=new String();
stu[n].onescore=new String();
stu[n].all=s;
stu[n++].getone();
s=bfr.readLine();
}
for(int i=0;i<n-1;i++){
for(int j=i+1;j<n;j++){
if(stu[i].onescore.compareTo(stu[j].onescore)>0){
Student temp=stu[i];
stu[i]=stu[j];
stu[j]=temp;
}
}
}
if(!jta2.getText().equals("")){
jta2.append("\n");
}
for(int i=0;i<n;i++){
jta2.append(stu[i].all+"\n");
}
bfr.close();
fr.close();
}catch (IOException e1) {
System.out.println("文件打开失败");
}
}
}
}
public class main {
public static void main(String []args){
new wln();
}
}
|
