Java字符串练习
题目要求
代码实现
public class toArray {
public static void main(String[] args) {
int[] arr = {1, 2, 3, 4, 5};
String res = fromArrayToString(arr);
System.out.println(res);
}
public static String fromArrayToString(int[] arr) {
String str = "[";
for (int i = 0; i < arr.length; i++) {
if (i != arr.length - 1) {
str += "world" + arr[i] + "#";
} else {
str += "world" + arr[i] + "]";
}
}
return str;
}
}
题目要求
代码实现
import java.util.Scanner;
public class Count {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
String str = sc.next();
int countUpper = 0;
int countNumber = 0;
int countLower = 0;
int countOther = 0;
char[] chars = str.toCharArray();
for (int i = 0; i < chars.length; i++) {
if (chars[i] >= 'A' && chars[i] <= 'Z') {
countUpper++;
} else if (chars[i] >= 'a' && chars[i] <= 'z') {
countLower++;
} else if (chars[i] >= '0' && chars[i] <= '9') {
countNumber++;
} else {
countOther++;
}
}
System.out.println("大写字母:" + countUpper);
System.out.println("小写字母:" + countLower);
System.out.println("数字:" + countNumber);
System.out.println("其他字符:" + countOther);
}
}