1.测试你活了多少天
public class hiredate {
public static void main(String[] args) throws ParseException {
System.out.println("请输入生日：");
Scanner scanner = new Scanner(System.in);
String myhiredate = scanner.nextLine();
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");
Date date = simpleDateFormat.parse(myhiredate);
long mytime = date.getTime();
System.out.println(mytime);
Date date1 = new Date();
long nowtime = date1.getTime();
System.out.println(nowtime);
long timecha = nowtime-mytime;
System.out.println(timecha/1000/60/60/24);
}
}
2.学生成绩表(主类)
public class ScoreSort {
public static void main(String[] args) throws IOException {
List<StudentInfo> studentInfoList = new ArrayList<>();
FileReader fileReader = new FileReader("e:/student_info.txt");
BufferedReader bufferedReader = new BufferedReader(fileReader);
String header = bufferedReader.readLine();
String string = bufferedReader.readLine();
while (string != null)
{
String[] strArrays = string.split(" ");
List<String> stringList = new ArrayList<>();
for(int i = 0; i < strArrays.length;i++)
{
if(!strArrays[i].equals(""))
{
stringList.add(strArrays[i].replace("\t",""));
}
}
StudentInfo studentInfo = new StudentInfo();
studentInfo.setNo(Integer.parseInt(stringList.get(0)));
studentInfo.setName(stringList.get(1));
studentInfo.setChinese_score(Integer.parseInt(stringList.get(2)));
studentInfo.setMath_score(Integer.parseInt(stringList.get(3)));
studentInfo.setEng_score(Integer.parseInt(stringList.get(4)));
studentInfoList.add(studentInfo);
// System.out.println(stringList);
string = bufferedReader.readLine();
}
// System.out.println(studentInfoList);
for(StudentInfo studentInfo : studentInfoList)
{
studentInfo.setTotal_score(studentInfo.getChinese_score()+studentInfo.getEng_score()+studentInfo.getMath_score());
studentInfo.setAvg_score(studentInfo.getTotal_score() / 3);
}
List<StudentInfo> studentInfoListSort = new ArrayList<>();
for(StudentInfo studentInfo : studentInfoList)
{
studentInfoListSort.add(studentInfo);
}
Collections.sort(studentInfoListSort);
Map<Integer,Integer> map = new HashMap<>();//key学号，值是名次
int index = 1;
for(StudentInfo studentInfo : studentInfoListSort)
{
map.put(studentInfo.getNo(),index);
index++;
}
for(StudentInfo studentInfo : studentInfoList)
{
int order = map.get(studentInfo.getNo());
studentInfo.setSort(order);
}
// System.out.println(studentInfoList);
FileWriter fileWriter = new FileWriter("e:/student_sort.txt");
BufferedWriter bufferedWriter = new BufferedWriter(fileWriter);
bufferedWriter.write(header);
bufferedWriter.newLine();
for(StudentInfo studentInfo : studentInfoList)
{
bufferedWriter.write(studentInfo.toString());
bufferedWriter.newLine();
}
bufferedWriter.flush();
}
}
学生成绩表（学生类）
public class StudentInfo implements Comparable {
int no;
String name;
int chinese_score;
int eng_score;
int math_score;
double avg_score;
int total_score;
int sort;
@Override
public String toString() {
// return "StudentInfo{" +
// "no=" + no +
// ", name='" + name + '\'' +
// ", chinese_score=" + chinese_score +
// ", eng_score=" + eng_score +
// ", math_score=" + math_score +
// ", avg_score=" + avg_score +
// ", total_score=" + total_score +
// ", sort=" + sort +
// '}';
return no + "\t" + name + "\t" + chinese_score + "\t"
+ eng_score + "\t" + math_score + "\t" + avg_score + "\t" + total_score + "\t" + sort;
}
public int getNo() {
return no;
}
public void setNo(int no) {
this.no = no;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getChinese_score() {
return chinese_score;
}
public void setChinese_score(int chinese_score) {
this.chinese_score = chinese_score;
}
public int getEng_score() {
return eng_score;
}
public void setEng_score(int eng_score) {
this.eng_score = eng_score;
}
public int getMath_score() {
return math_score;
}
public void setMath_score(int math_score) {
this.math_score = math_score;
}
public double getAvg_score() {
return avg_score;
}
public void setAvg_score(double avg_score) {
this.avg_score = avg_score;
}
public int getTotal_score() {
return total_score;
}
public void setTotal_score(int total_score) {
this.total_score = total_score;
}
public int getSort() {
return sort;
}
public void setSort(int sort) {
this.sort = sort;
}
@Override
public int compareTo(Object o) {
StudentInfo studentInfo = (StudentInfo)o;
// if(this.total_score == studentInfo.total_score)
// {
// return this.total_score - studentInfo.total_score;
// }
// else if(this.total_score > studentInfo.total_score)
// {
// return this.total_score - studentInfo.total_score;
// }
// else if(this.total_score < studentInfo.total_score)
// {
// return this.total_score - studentInfo.total_score;
// }
return studentInfo.total_score - this.total_score;
}
}
3.日历
public class CalendarDemo {
public static void main(String[] args) throws ParseException {
Scanner scanner = new Scanner(System.in);
System.out.println("输入日期:格式为：yyyy-MM-dd");
String strDate = scanner.nextLine();
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");
Date date = simpleDateFormat.parse(strDate);
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
int day_counts = calendar.getActualMaximum(Calendar.DATE);
int day = calendar.get(Calendar.DATE);
calendar.set(calendar.get(Calendar.YEAR),calendar.get(Calendar.MONTH),1);
int first_day_of_month = calendar.get(Calendar.DAY_OF_WEEK);//6
int[] array = new int[42];
int index = 1;
for(int i = first_day_of_month - 1; i < first_day_of_month - 1 + day_counts; i++)
{
array[i] = index;
index++;
}
System.out.println("日\t一\t二\t三\t四\t五\t六");
for(int i = 0; i < array.length; i++)
{
if(i % 7 == 0 && i != 0)
{
System.out.println();
}
if(array[i] != 0)
{
if(array[i] == day)
{
System.out.print("*");
}
System.out.print(array[i]+ "\t");
}
else
{
System.out.print(""+ "\t");
}
}
// System.out.println(Arrays.toString(array));
// calendar.add(Calendar.MONTH,1);
// int n = calendar.getActualMaximum(Calendar.DATE);
// System.out.println(n);
// calendar.set(calendar.get(Calendar.YEAR),calendar.get(Calendar.MONTH),1);
// System.out.println(calendar.get(Calendar.DAY_OF_WEEK));
}
}
