编写一个程序,提示用户输入学生个数,学生学号和他们的课程成绩,然后按照学生成绩的降序打印学生的学号.
import java.util.Arrays;
import java.util.Scanner;
public class Test {
public static void main(String[] args) {
Scanner reader = new Scanner(System.in);
System.out.println("请输入学生个数");
String strStuNum = reader.nextLine();
int stuNum = Integer.parseInt(strStuNum);
String[] sNames = new String[stuNum];
int[] sScore = new int[stuNum];
for(int i = 0;i < stuNum; i++){
System.out.println("请输入第"+(i+1)+"个学生的姓名");
sNames[i] = reader.nextLine();
System.out.println("请输入"+sNames[i]+"的分数");
sScore[i] = Integer.parseInt(reader.nextLine());
}
int tempScore;
String tempName;
for (int i = stuNum - 1; i > 0; --i) {
boolean isSort=false;
for (int j = 0; j < i; ++j) {
if (sScore[j + 1] < sScore[j]) {
tempScore = sScore[j];
tempName = sNames[j];
sScore[j] = sScore[j + 1];
sNames[j] = sNames[j + 1];
sScore[j + 1] = tempScore;
sNames[j + 1] = tempName;
isSort=true;
}
}
if(!isSort)break;
}
for(int i = stuNum - 1; i >= 0;i--){
System.out.println("第"+(stuNum - i)+"名"+sNames[i]+""+sScore[i]);
}
}
}
import java.util.Scanner;
public class StudentInAndOut {
private String name;
private long grade;
public long getGrade() {
return grade;
}
public void setGrade(long grade) {
this.grade = grade;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String toString(){
return this.name;
}
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.println("请输入学生数");
int stuNumT = sc.nextInt();
StudentInAndOut objArr[] = new StudentInAndOut[stuNumT];
for(int i = 0; i < objArr.length; i++){
objArr[i] = new StudentInAndOut();
System.out.println("请输入第" + (i+1) + "个学生的姓名");
String name = sc.next();
objArr[i].setName(name);
System.out.println("请输入第" + (i+1) + "个学生的成绩");
long grade = sc.nextLong();
objArr[i].setGrade(grade);
}
System.out.println("打印开始:");
for(int i = 0; i < objArr.length; i++){
for(int j = i+1; j < objArr.length; j++){
if(objArr[i].getGrade() < objArr[j].getGrade()){
StudentInAndOut s = new StudentInAndOut();
s = objArr[i];
objArr[i] = objArr[j];
objArr[j] = s;
}
}
}
for(int i=0; i < objArr.length; i++){
System.out.println(objArr[i].getName()+"的成绩是："+objArr[i].getGrade());
}
}
}
import java.util.Scanner;
class StudentInfo {
private String stuno;
private int score;
public String getStuno() {
return stuno;
}
public void setStuno(String stuno) {
this.stuno = stuno;
}
public int getScore() {
return score;
}
public void setScore(int score) {
this.score = score;
}
}
public class Test205 {
public static void main(String[] args) {
StudentInfo[] stu = new StudentInfo[20];
Scanner scan = new Scanner(System.in);
int nCount = 0;
System.out.println("请输入输入的学生个数：");
nCount = scan.nextInt();
System.out.println("请输入输入的学生学号和分数(以空格隔开)：");
int nCurrent = 0;
while (nCurrent < nCount) {
Scanner sca = new Scanner(System.in);
String strLine = sca.nextLine();
String[] strLineArr = strLine.split(" ");
StudentInfo st = new StudentInfo();
st.setStuno(strLineArr[0]);
st.setScore(Integer.parseInt(strLineArr[1]));
stu[nCurrent] = st;
nCurrent++;
}
// 排序
for (int i = 0; i < nCount; i++) {
for (int j = 0; j < nCount - i - 1; j++) {
if (stu[j].getScore() > stu[j + 1].getScore()) {
StudentInfo tmp = new StudentInfo();
tmp.setStuno(stu[j].getStuno());
tmp.setScore(stu[j].getScore());
stu[j].setStuno(stu[j + 1].getStuno());
stu[j].setScore(stu[j + 1].getScore());
stu[j + 1].setStuno(tmp.getStuno());
stu[j + 1].setScore(tmp.getScore());
}
}
}
// 输出学生信息
System.out.println("学号 分数");
for (int i = 0; i < nCount; i++) {
System.out.println(stu[i].getStuno() + " " + stu[i].getScore());
}
}
}
运行结果如下：
建一个学生类啊，有学号和成绩两个属性
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