帮我解决几个问题，谢谢

唉～～，没有代码，只有思路：1.Map的话可以采用HashMap<String,Integer>类型，可以使用
Set<Integer> set = new TreeSet(map.values());
就可以了，TreeSet会自动排序，不需要人工干预。
这个问题也是有bug的，TreeSet中不能存放两个相同的值，如果有两个学生的成绩一样就只会存一个！2.代码：
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;public class Test {
    public static void main(String[] args) throws IOException {
        Runtime run = Runtime.getRuntime();
        Process process = run.exec("cmd /cdir");
        InputStream is = process.getInputStream();
        BufferedReader br = new BufferedReader(new InputStreamReader(is));
        String str = "";
        while((str=br.readLine())!=null) {
            System.out.println(str);
        }
        br.close();
    }
}3.做日历比较烦，可以使用Calendar类，自己去看看API吧。

我不是呀，我是自学java的买了这本书课后的习题有的不会，所以就请教大家，我不是学软件的我是学网络的。不过还有那么多好心人帮助我很高兴，谢谢大家了。

package calendar;import java.awt.*;
import java.awt.event.*;
import java.text.DateFormat;
import java.util.Calendar;
import java.util.Date;
import javax.swing.*;
public class MyCalendar extends JFrame implements MouseListener{ int year, month, day;
JTextField showDay[];
JLabel title[];
Calendar calendar;
int weekDay;
Month chargeMonth;
Year chargeYear;
String[] week = {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };
JPanel leftPanel, rightPanel;

public MyCalendar(int year, int month, int day) {
super("Calendar" + "                     "
  + "by unique.wu" + "               "
  + "May you success!");
leftPanel = new JPanel();
JPanel leftCenter = new JPanel();
leftCenter.setLayout(new GridLayout(7,7));

rightPanel = new JPanel();
this.year = year;
this.month = month;
this.day = day;
chargeYear = new Year(this);
chargeYear.setYear(year);
chargeMonth = new Month(this);
chargeMonth.setMonth(month);

title = new JLabel[7];
showDay = new JTextField[42];
for(int j=0; j<7; j++) {
title[j] = new JLabel();
title[j].setText(week[j]);
title[j].setBorder(BorderFactory.createRaisedBevelBorder());
leftCenter.add(title[j]);
}
title[0].setForeground(Color.red);
title[6].setForeground(Color.pink);

for(int i=0; i<42; i++) {
showDay[i] = new JTextField();
showDay[i].addMouseListener(this);
showDay[i].setEditable(false);
leftCenter.add(showDay[i]);
}
calendar = Calendar.getInstance();
Box box = Box.createHorizontalBox();
box.add(chargeYear);
box.add(chargeMonth);
leftCenter.add(box);
leftPanel.setLayout(new BorderLayout());
leftPanel.add(leftCenter.add(box), BorderLayout.NORTH);
leftPanel.add(leftCenter, BorderLayout.CENTER);
String myString1 = DateFormat.getDateInstance().format(new Date());
String myString2 = DateFormat.getTimeInstance().format(new Date());
leftPanel.add(new Label(myString1 + "    " + myString2), BorderLayout.SOUTH);
leftPanel.validate();
Container con = getContentPane();
con.add(leftPanel, BorderLayout.CENTER);
con.validate();
setCalendar(year, month);
addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
setVisible(true);
setBounds(50, 25, 450, 240);
validate();
}
public void setCalendar(int year, int month) {
calendar.set(year, month-1, 1);

weekDay = calendar.get(Calendar.DAY_OF_WEEK) - 1;
if(month ==1 || month == 2 || month == 3 || month == 5 || month == 7||
month == 8 || month == 10 ||month == 10|| month == 12) {
arrangeNumber(weekDay, 31);
} else if (month ==4 || month ==6 || month == 9 || month ==11) {
arrangeNumber(weekDay, 30);
} else if (month ==2) {
if((year%4 == 0 && year %100 !=0) || (year % 400 == 0)) {
arrangeNumber(weekDay, 29);
} else {
arrangeNumber(weekDay, 28);
}
}
}

public void arrangeNumber(int weekDay, int monthDays) {
for(int i = weekDay, n=1; i<weekDay + monthDays; i++) {
showDay[i].setText(" " + n);
if (n == day) {
showDay[i].setForeground(Color.green);
showDay[i].setFont(new Font("TimesRoman", Font.BOLD, 20));
} else {
showDay[i].setFont(new Font("TimesRoman", Font.BOLD, 12));
showDay[i].setForeground(Color.blue);
}
if ((i%7 == 6) && (n != day)) {
showDay[i].setForeground(Color.pink);
}
if((i%7 == 0) && (n != day)){
showDay[i].setForeground(Color.red);
}
n++;
}
for (int i=0; i<weekDay; i++) {
showDay[i].setText(" ");
}
for (int i = weekDay + monthDays; i<42;i++) {
showDay[i].setText(" ");
}

}
public int getYear() {
return year;
}
public void setYear(int y) {
year = y; }
public int getMonth() {
return month;
}
public void setMonth(int m) {
month = m;
}
public int getDay() {
return day;
}
public void setDay(int d) {
day = d;
}
public void mousePressed(MouseEvent e) {
JTextField source = (JTextField)e.getSource();
try {
day = Integer.parseInt(source.getText());
} catch (Exception ee) {
}
}

public void mouseClicked(MouseEvent e) {

} public void mouseEntered(MouseEvent e) {

} public void mouseExited(MouseEvent e) {

}
public void mouseReleased(MouseEvent e) {

}
public static void main(String[] args) {
Calendar calendar = Calendar.getInstance();
int y = calendar.get(Calendar.YEAR);
int m = calendar.get(Calendar.MONTH) + 1;
int d = calendar.get(Calendar.DAY_OF_MONTH);
new MyCalendar(y, m , d);
}
}
---------------------------------------------------

package calendar;import java.awt.Color;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JTextField;public class Year extends Box implements ActionListener{

int year = 0;
JTextField showYear = null;
JButton nextYear,lastYear;
MyCalendar calendar;
public Year(MyCalendar calendar) {
super(BoxLayout.X_AXIS);
showYear = new JTextField(4);
showYear.setForeground(Color.blue);
showYear.setFont(new Font("TimesRomn", Font.BOLD, 14));
this.calendar = calendar;

year = calendar.getYear();
nextYear = new JButton(" nextYear");
lastYear = new JButton(" lastYear");
add(lastYear);
add(showYear);
add(nextYear);
showYear.addActionListener(this);
lastYear.addActionListener(this);
nextYear.addActionListener(this);
}
public void setYear(int year) {
this.year =year;
showYear.setText(" " + year);
}
public int getYear() {
return year;
}
public void actionPerformed(ActionEvent e) {
if(e.getSource() == lastYear) {
year = year - 1;
showYear.setText(" " + year);
calendar.setYear(year);
calendar.setCalendar(year, calendar.getMonth());
} else if (e.getSource() == nextYear) {
year = year + 1;
showYear.setText(" " + year);
calendar.setYear(year);
calendar.setCalendar(year, calendar.getMonth());
} else if(e.getSource() == showYear) {
try {
year = Integer.parseInt(showYear.getText());
showYear.setText(" " + year);
calendar.setYear(year);
calendar.setCalendar(year, calendar.getMonth());
} catch (NumberFormatException ee) {
showYear.setText(" " + year);
calendar.setYear(year);
calendar.setCalendar(year, calendar.getMonth());
}

}
}}-----------------------------------------------------------package calendar;import javax.swing.*;
import java.util.*;
import java.awt.*;
import java.awt.event.*;public class Month extends Box implements ActionListener {
int month;
JTextField showMonth = null;
JButton nextMonth,lastMonth;
MyCalendar calendar;
public Month(MyCalendar calendar) {
super(BoxLayout.X_AXIS);
this.calendar = calendar;
showMonth = new JTextField(2);
month = calendar.getMonth();
showMonth.setEditable(false);
showMonth.setForeground(Color.blue);
showMonth.setFont(new Font("TimesRoman", Font.BOLD, 16));
nextMonth = new JButton("nextMonth");
lastMonth = new JButton("lastMonth");
add(lastMonth);
add(showMonth);
add(nextMonth);
lastMonth.addActionListener(this);
nextMonth.addActionListener(this);
showMonth.setText(" " + month);
}
public void setMonth(int month) {
if(month<=12 && month>=1) {
this.month = month;
} else {
this.month = 1;
}
showMonth.setText(" " + month);
}
public int getMonth() {
return month;
}
public void actionPerformed(ActionEvent e) {
if(e.getSource() == lastMonth) {
if(month >= 2) {
month = month - 1;
calendar.setMonth(month);
calendar.setCalendar(calendar.getYear(), month);
} else if(month == 1) {
month = 12;
calendar.setMonth(month);
calendar.setCalendar(calendar.getYear(), month);
}
showMonth.setText(" " + month);
} else if(e.getSource() == nextMonth) {
if(month < 12) {
month = month + 1;
calendar.setMonth(month);
calendar.setCalendar(calendar.getYear(), month);
} else if( month == 12) {
month = 1;
calendar.setMonth(month);
calendar.setCalendar(calendar.getYear(), month);
}
showMonth.setText(" " + month);
}

}}晕，fireFox 不支持那个脚本的插件。。
以前写的日历的程序

调试易

帮我解决几个问题，谢谢

解决方案 »