5.3 编写程序,统计出字符串“want you to know one thing”中字母n和字母o的出现字数。
package book;
public class JiOu {
public static void main(String[] args) {
String str = "want you to know one thing";
char a[] = str.toCharArray();
int num1 = 0;
int num2 = 0;
for (int i = 0; i < a.length; i++) {
if (a[i] == 'n') {
num1++;
}
if (a[i] == 'o') {
num2++;
}
}
System.out.println("n的个数:" + num1);
System.out.println("n的个数:" + num2);
}
}
运行结果为:
n的个数:4
n的个数:4