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package cn.wang.day10;
//import java.util.Arrays;
import java.util.Scanner;
/**
* @author WangShiwu
*
*2.分析以下需求,并用代码实现: (1)从键盘循环录入录入一个字符串,输入"end"表示结束
*(2)将字符串中大写字母变成小写字母,小写字母变成大写字母,其它字符用"*"代替,并统计字母的个数 举例:
*键盘录入:Hello12345World 输出结果:hELLO*****wORLD 总共10个字母
*/
public class Demo02_HomeWork {
public static void main(String[] args) {/*Scanner sc = new Scanner(System.in);
System.out.println("请输入字符串,(end表示结束):");
String result = "";
while (true) {
String str = sc.nextLine();
if(str.endsWith("end")) {
result = str.substring(0, str.length() - 3);
break;
}
}
String num = "";
int count = 0;
char[] ch = result.toCharArray();
for (int index = 0;
index < ch.length;
index++) {
if (ch[index] >= 65 && ch[index] <=90) {//可以ch[index] >= 'A' && ch[index] <= 'Z'
num = num + (ch[index] + "").toLowerCase();
count++;
} else if (ch[index] >= 97 && ch[index] <= 122){//可以ch[index] >= 'A' && ch[index] <= 'z'
num = num + (ch[index] + "").toUpperCase();
count++;
} else {
num = num + "*";
}
}
System.out.println("转换后的字符串为:" + num);
System.out.println("总共" + count +
"个字母");
sc.close();
*///法二
Scanner sc = new Scanner(System.in);
System.out.println("请输入字符串,(end表示结束):");
while (true) {
String str = sc.nextLine();
if ("end".equals(str)) {
break;
}
int count = 0;
char[] ch = str.toCharArray();
for (int index = 0;
index < ch.length;
index++) {
if (ch[index] >= 'A' && ch[index] <= 'Z') {
ch[index] += 32;
count++;
} else if (ch[index] >= 'a' && ch[index] <= 'z') {
ch[index] -= 32;
count++;
} else {
ch[index] = '*';
}
}
System.out.println("转换后的字符串为:" + new String(ch));
System.out.println("总共" + count + "个字母");
}
sc.close();
}
}
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