详解一个Java编程题实例
public class Example50 {
public static void main(String[] args) {
stud();
}
public static void stud() {
Scanner ss = new Scanner(System.in);
String[][] a = new String[5][6];
for (int i = 1; i < 6; i++) {
System.out.print("请输入第" + i + "个学生的学号:");
a[i - 1][0] = ss.nextLine();
System.out.print("请输入第" + i + "个学生的姓名:");
a[i - 1][1] = ss.nextLine();
for (int j = 1; j < 4; j++) {
System.out.print("请输入该学生的第" + j + "个成绩:");
a[i - 1][j + 1] = ss.nextLine();
}
System.out.println("\n");
}
// 以下计算平均分
float avg;
int sum;
for (int i = 0; i < 5; i++) {
sum = 0;
for (int j = 2; j < 5; j++) {
sum = sum + Integer.parseInt(a[i][j]);
}
avg = (float) sum / 3;
a[i][5] = String.valueOf(avg);
}
// 以下写磁盘文件
String s1;
try {
File f = new File("E:\\Eclipse Workplace\\Java经典算法\\src\\stud.txt");
if (f.exists()) {
System.out.println("文件存在");
} else {
System.out.println("文件不存在,正在创建文件");
f.createNewFile();// 不存在则创建
}
BufferedWriter output = new BufferedWriter(new FileWriter(f));
for (int i = 0; i < 5; i++) {
for (int j = 0; j < 6; j++) {
s1 = a[i][j] + "\r\n";
output.write(s1);
}
System.out.println();
}
output.close();
System.out.println("数据已写入E盘文件stud中!");
} catch (Exception e) {
e.printStackTrace();
}
}
}
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