计算全班学员的平均分
方法一
int[] a = {60, 70, 80, 90};
int b = 0;
int s = 0;
for (int i = 0; i < a.length; i++) {
b = a[i];
s += a[i];
System.out.println(b);
}
System.out.println("平均成绩是：" + s / a.length);
方法二
Scanner scanner = new Scanner(System.in);
double[] a = new double[5];
double d=0;
for (int i = 0;i<a.length;i++){
System.out.println("输入成绩");
double g=scanner .nextInt();
a[i]=g;
d+=a[i];
}
System.out.println("平均分是"+d/a.length);
有一个数列：8，4，2，1，23，344，12 循环输出数列的值,求数列中所有数值的和猜数游戏：从键盘中任意输入一个数据，判断数列中是否包含此数
Scanner scanner = new Scanner(System.in);
int[] a = {8, 4, 2, 1, 23, 344, 12};
int b = 0;
System.out.println("输入一个数");
int c = scanner.nextInt();
int i;
for (i = 0; i < a.length; i++) {
b += a[i];
if (c == a[i]) {
System.out.println("包含");
break;
}
}
if (i == a.length) {
System.out.println("不包含");
}
System.out.println(b);
从键盘输入本次Java考试五位学生的成绩，求考试成绩最高分
Scanner scanner = new Scanner(System.in);
int[] a = new int[5];
int max = 0;
int i;
for (i = 0; i < a.length; i++) {
System.out.println("输入成绩");
int g = scanner.nextInt();
a[i] = g;
if (max <= a[i]) {
max = a[i];
}
}
System.out.println("最大成绩是" + max);
有一组学员的成绩{50，90，70，80}，将它们按升序排列。要增加一个学员的成绩，将它插入成绩序列，并保持升序。
int[] a = {50, 90, 70, 80};
Arrays.sort(a);
System.out.println("数");
int b = scanner.nextInt();
int c = 0;
for (int i = 0; i < a.length; i++) {
if (b <= a[i]) {
c = i;
break;
}
}
int[] d = new int[5];
//插入第一步 for (int i = 0; i < c; i++) {
d[i] = a[i];
}
//第二部 d[c] = b;
//第三部 for (int i = c + 1; i < d.length; i++) {
d[i] = a[i - 1];
}
//遍历 for (int i = 0; i < d.length; i++) {
System.out.println(d[i]);
}
将 一组乱序的字符进行排序 进行升序和逆序输出
char[] a={'s','d','b','h'};
Arrays.sort(a);
for (int i = 0;i<a.length;i++){
System.out.println(a[i]);
}
for (int i = a.length-1;i>=0;i--){
System.out.print(a[i]);
}
定义一个字符串数组，查找某个字符串在数组中出现的次数
Scanner scanner = new Scanner(System.in);
String[] a = {"ww", "dd", "ww", "aa", "dd", "ww"};
int c = 0;
System.out.println("输入字符串");
String b = scanner.next();
for (int i = 0; i < a.length; i++) {
if (b.equals(a[i])) {
c++;
}
}
System.out.println(b + "出现" + c + "次");
