第一题:
输入:
第一行:学生人数
接下来每一行:姓名 语文分 数学分 英语分
输出:(分数全相同排名一样,按姓名字典序排序)
rank1 :name: total: chinese: math: english:
rank2:…
rank2:…
rank4:…
import java.util.*;
public class msBank01 {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
//获取第一行(学生数)
String s = sc.nextLine();
//创建一个排序Set 传进一个排序规则匿名内部类
TreeSet<Student> studentTreeSet = new TreeSet<>((o1, o2) -> {
//根据总分--语文--数学--英语--姓名(字典序)进行排序
if (o1.getTotal() != o2.getTotal()) {
return o2.getTotal() - o1.getTotal();
} else if (o1.getChinese() != o2.getChinese()) {
return o2.getChinese() - o1.getChinese();
} else if (o1.getMath() != o2.getMath()) {
return o2.getMath() - o1.getMath();
} else if (o1.getEnglish() != o2.getEnglish()) {
return o2.getEnglish() - o1.getEnglish();
} else {
return o1.getName().compareTo(o2.getName());
}
});
//按行遍历 创建student塞入TreeSet
for (int i = 0; i < Integer.parseInt(s); i++) {
Student student = new Student();
String help = sc.nextLine();
String[] s1 = help.split(" ");
student.setName(s1[0]);
student.setChinese(Integer.parseInt(s1[1]));
student.setMath(Integer.parseInt(s1[2]));
student.setEnglish(Integer.parseInt(s1[3]));
student.setTotal(Integer.parseInt(s1[1])+Integer.parseInt(s1[2])+Integer.parseInt(s1[3]));
studentTreeSet.add(student);
}
//遍历TreeSet index代表rank(排名)
//plus意义,排名相同时,plus代替index++
int index = 0;
int plus = 1;
Student pre = new Student();
for (Student student : studentTreeSet) {
if (index!=0&&pre.getTotal()==student.getTotal()&&pre.getChinese()== student.getChinese()&&pre.getMath()==student.getMath()&&pre.getEnglish()== student.getEnglish()){
print(student,index);
plus++;
}else {
index = index+plus;
plus=1;
print(student,index);
}
//pre记录上一个学生,比较是否两人排名一样
pre = student;
}
}
//提取出的print方法
public static void print(Student student,int rank){
System.out.println("rank:"+rank+" name:"+student.getName()+" total:"+student.getTotal()+" chinese:"+student.getChinese()+" math:"+student.getMath()+" english:"+student.getEnglish());
}
//学生类
static class Student{
String name;
int Chinese;
int Math;
int English;
int Total;
//...getter and setter...
}
第二题:
第一行输入"1" 判断有几行非空
输入"Q"打印“Quit”
输入其他:打印
Wrong input, Please re-choose
Menu Function Test
1: Count Lines
Q: Quit
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
String s = sc.nextLine();
if ("1".equals(s)){
//1
int res = 0;
while (sc.hasNext()){
String str = sc.nextLine();
if (str!=null&&str.length()!=0){
res++;
}
}
System.out.println(res);
}else if ("Q".equals(s)){
//Quit
System.out.println("Quit");
}else {
System.out.println("Wrong input, Please re-choose\n" +
"Menu Function Test\n" +
"1: Count Lines\n" +
"Q: Quit");
}
}
}