import java.util.Scanner;
public class CreatArray {
public static void main(String[] args) {
/* 初始化
int book[][] = new int[3][4];
int[][] book1 =new int[3][1];
int[] book2[] =new int[1][2];
int[][] book3 = new int[][] {{1,2,3},{7,8,9}};
System.out.println(book3[0][2]);*/
/*多维数组存储多年成绩*/
//声明六个变量，分别代表6门科目;
int yuWenIndex = 0;
int shuXueIndex = 1;
int waiYuIndex = 2;
int wuLiIndex = 3;
int huaXueIndex = 4;
int shengWuIndex = 5;
//每门课的成绩
String names[] = new String[6];
names[yuWenIndex] = “语文”;
names[shuXueIndex] = “数学”;
names[waiYuIndex] = “外语”;
names[wuLiIndex] = “物理”;
names[huaXueIndex] = “化学”;
names[shengWuIndex] = “生物”;
Scanner in = new Scanner(System.in);
System.out.println(“请问要保存几年的成绩?”);
int yearStore = in.nextInt();
double scores[][] = new double[yearStore][names.length];
for (int i = 0; i < yearStore; i++) {
for (int j = 0; j < names.length; j++) {
scores[i][j] = 80 + java.lang.Math.random() * 20;
System.out.println(“第” + (i + 1) + “年” + “的” + names[j] + “的成绩是:” + scores[i][j]);
}
}
boolean conti=true;
while (conti) {
System.out.println(“请输入要进行的操作编号！”);
System.out.println(“1:求某年最好的成绩\n” + “2:求某年的平均成绩\n”
+ “3:求所有年份最好的成绩\n” + “4:求某门课历年最好的成绩”);
int oprId = in.nextInt();
switch (oprId) {
case 1:
System.out.println(“请输入要求哪一年的最好成绩”);
int year = in.nextInt() – 1;
if (year < 0 || year >= yearStore) {
System.out.println(“非法的年份”);
break;
}
int bestYearofScocre = 0;
for (int i = 0; i < scores[year].length; i++) {
if (scores[year][bestYearofScocre] < scores[year][i]) {
bestYearofScocre = i;
}
}
System.out.println(“第” + (year + 1) + “年最好的成绩是：” + names[bestYearofScocre] + “:” + scores[year][bestYearofScocre]);
break;
case 2:
System.out.println(“请输入要求哪一年的平均成绩”);
year = in.nextInt() – 1;
if (year < 0 || year >= yearStore) {
System.out.println(“非法的年份”);
break;
}
double totalScore = 0;
for (int i = 0; i < scores[year].length; i++) {
totalScore += scores[year][i];
}
System.out.println(“第” + (year + 1) + “年的平均成绩是:” + (totalScore / names.length));
break;
case 3:
int bestofScoreyearId = 0;
year = 0;
for (int i = 0; i < scores.length; i++) {
//System.out.println(“scores.length is ” + scores.length);
for (int j = 0; j < scores[i].length; j++) {
// System.out.println(“scores[i].length is ” + scores[i].length);
if (scores[year][bestofScoreyearId] < scores[i][j]) {
year = i;
bestofScoreyearId = j;
}
}
}
System.out.println(“历年最好成绩为第:” + (year + 1) + “年的” + names[bestofScoreyearId] + “成绩:” + scores[year][bestofScoreyearId]);
break;
case 4:
System.out.println(“请问要查询哪门课历年最好的成绩！”);
int scoreId = in.nextInt()-1;
year=0;
for (int i = 1; i < scores.length; i++) {
if (scores[year][scoreId]<scores[i][scoreId]){
year=i;
}
}
System.out.println(names[scoreId]+”的历年最好成绩是：”+”第”+(year+1)+”年,成绩为:”+scores[year][scoreId]);
break;
default:
System.out.println(“程序结束！”);
conti =false;
}
}
}
}
