Java input Five floating-point numbers saved to a file and appended to the file.

Import Java.awt.borderlayout;import java.awt.eventqueue;import Javax.swing.jframe;import Javax.swing.JPanel;import Javax.swing.border.emptyborder;import Java.awt.color;import Java.awt.event.actionevent;import Java.awt.event.actionlistener;import Java.io.bufferedreader;import Java.io.datainputstream;import Java.io.dataoutputstream;import Java.io.file;import Java.io.fileinputstream;import java.io.FileNotFoundException; Import Java.io.fileoutputstream;import java.io.filereader;import java.io.filewriter;import java.io.IOException; Import Java.io.printwriter;import java.util.vector;import javax.swing.defaultlistmodel;import Javax.swing.JLabel; Import Javax.swing.joptionpane;import Javax.swing.jscrollpane;import Javax.swing.jtextfield;import Javax.swing.jlist;import Javax.swing.jbutton;import Javax.swing.listmodel;import Java.awt.Font;import Javax.swing.swingconstants;import Javax.swing.jscrollbar;public class Testio extends JFrame implements ActionListener {Private JPanel contentpane;private JTextField number;    private JButton input;    private int num;    Private Defaultlistmodel listmodel,list;    Private Vector<double> V;    Private JList Fudian1;    Private JList fudian2;    Private JButton Anwser;    Private JButton btnsave;       Private double a[]; /** * Launch the application. */public static void Main (string[] args) {Eventqueue.invokelater (new Runnable () {public void run () {try {testio frame = NE W Testio (); frame.setvisible (true);} catch (Exception e) {e.printstacktrace ();}}});} /** * Create the frame. */public Testio () {v=new vector<double> (); Setforeground (Color.green); Settitle ("\u6d6e\u70b9\u6570\u6392\ u5e8f "); Setdefaultcloseoperation (jframe.exit_on_close); SetBounds (+, +), ContentPane = new JPanel (); Contentpane.setborder (New Emptyborder (5, 5, 5, 5)); Setcontentpane (ContentPane); contentpane.setlayout (null); JLabel Lblidhu = new JLabel ("\u6d6e\u70b9\u6570\u4e2a\u6570"); Lblidhu.setbounds (n.; Lblidhu); number = new JTextField (Number.setbounds), Contentpane.add (number), Number.setcolumns (), input = new JButton ("\ Input.setbounds (u8f93\u5165), 201, Input.addactionlistener (this); Contentpane.add (input); Listmodel = new Defaultlistmodel (); list = new Defaultlistmodel (); fudian1 = new JList (Listmodel); fudian1.setvalueisadjusting (true); JScrollPane j = new JScrollPane (fudian1) j.setbounds (155,, 133); Contentpane.add (j); fudian2 = new JList (list); JScrollPane J2 = new JScrollPane (fudian2), j2.setbounds (284,, 133); Contentpane.add (J2); anwser = new JButton ("\ Anwser.setbounds (U6253\U5F00); Anwser.addactionlistener (this); Contentpane.add (anwser); btnsave =-- New JButton ("\u4fdd\u5b58."); Btnsave.setbounds (257, ten, Btnsave.addactionlistener); Contentpane.add (btnsave); JLabel label = new JLabel ("\u6392\u5e8f\u4e4b\u524d"); Label.setbounds (156,, si); contentpane.add (label); JLabel label_1 = new JLabel ("\u6392\u5e8f\u4e4b\u540e"); Label_1.setbounds (2(Contentpane.add); (Label_1); JLabel Lbltip = new JLabel ("Tip\uff1a\u8bf7\u5148\u8f93\u5165\u6d6e\u70b9\u6570\u4e2a\u6570\uff0c\u6216\u8005\ U6253\u5f00\u6587\u4ef6 "), Lbltip.setverticalalignment (Swingconstants.top), Lbltip.setfont (New Font (" Microsoft Ya Black ", Lbltip.setbounds (Font.plain, 234, +); Contentpane.add (Lbltip);} @Overridepublic void actionperformed (ActionEvent e) {//TODO auto-generated method Stubif (E.getsource () ==input) { Listmodel.removeallelements (); string s = Number.gettext (); num = Integer.parseint (s); for (int i=1;i<=num;i++) {String name= "Please enter the number of" +i+ "; String ss= Joptionpane.showinputdialog (name); Listmodel.addelement (double.parsedouble (ss)); V.add ( Double.parsedouble (ss));}} if (E.getsource () ==btnsave) {Save ();} if (E.getsource () ==anwser) {v.removeallelements (); String name= "Please enter the document path ' C:\txt '"; String ss= Joptionpane.showinputdialog (name);        File File = new file (ss);            try {FileReader fr = new FileReader (file); BufferedReader br = new BufferedrEader (FR);                Try {string s, s2 = new String ();                    while ((s = br.readline ()) = null) {s2 + = s + "\ n";                V.add (double.parsedouble (s));                } br.close ();                SYSTEM.OUT.PRINTLN (S2);                System.out.println ("OK");                for (int i=0;i<v.size (); i++) {System.out.println (V.elementat (i)); }} catch (IOException E1) {//TODO auto-generated catch block E1.printstacktrac            E (); }} catch (FileNotFoundException E1) {//TODO auto-generated catch block E1.printstacktrace (        );        } int i,j;                 Double temp;                Num=v.size ();                String g = "" +num;                Number.settext (g);                A=new Double[num];                Listmodel.removeallelements (); for (i=0;i<num;i++) {a[i]=V.elementat (i);                Listmodel.addelement (A[i]);         } for (i=0;i<num-1;i++) for (j=i+1;j<num;j++) if (A[i]>a[j]) {temp=a[i];         A[I]=A[J];         A[j]=temp;        } v.removeallelements ();        for (i=num-1;i>=0;i--) {System.out.println (a[i]);        List.addelement (A[i]);        V.addelement (A[i]);                  } try {FileWriter writer = new FileWriter (ss, True); For (I=0;i<v.size (); i++) {double K=v.elementat (i);            String sss = k + "\ r \ n";             Writer.write (SSS);            System.out.println (k);              } writer.close ();              } catch (IOException E1) {e1.printstacktrace ();          }/* PrintWriter PW = null;              try {pw = new PrintWriter (new FileWriter (ss));            For (I=0;i<v.size (); i++) {double K=v.elementat (i);        Pw.print (k + "\ r \ n");      System.out.println (k);          }} catch (FileNotFoundException E1) {e1.printstacktrace ();          } catch (IOException E1) {e1.printstacktrace ();                  }finally {if (PW = null) {pw.close ();              PW = NULL; }} */}}public void Save () {String name= "Please enter save document path ' C:\txt '"; String ss= Joptionpane.showinputdialog (name);          PrintWriter pw = null;              try {pw = new PrintWriter (new FileWriter (ss));            for (int i=0;i<v.size (); i++) {double K=v.elementat (i);              Pw.print (k + "\ r \ n");            System.out.println (k);          }} catch (FileNotFoundException E1) {e1.printstacktrace ();          } catch (IOException E1) {e1.printstacktrace ();                  }finally {if (PW = null) {pw.close ();              PW = NULL; }          }}}

Java input Five floating-point numbers saved to a file and appended to the file.