Main.java 文件
public class Main {
public static void main(String[] args) {
StringBuffer searchstr = new StringBuffer("hello how are you. ");
int length = searchstr.length();
int count = 0;
for (int i = 0; i < length; i++) {
if (searchstr.charAt(i) != 'h')
continue;
count++;
searchstr.setCharAt(i, 'h');
}
System.out.println("发现 " + count
+ " 个 h 字符");
System.out.println(searchstr);
}
}
以上代码运行输出结果为: