Java基础String类-字符串反转
public class HomeworkTest03 {
public static void main(String[] args) {
Scanner s = new Scanner(System.in);
System.out.print("请输入你要反转的字符串：");
String s1 = s.next();
System.out.println(reverse(s1));
}
/**
* 调用String对象的charAt方法，将字符串从后往前依次取出来
* 然后添加到StringBuffer当中去，在转换成String对象
*
* @param str
* @return
*/
public static String reserve(String str) {
StringBuffer sb = new StringBuffer();
for (int i = str.length() - 1; i >= 0; i--) {
sb.append(str.charAt(i));
}
return sb.toString();
}
public static String reverse(String str) {
StringBuffer s = new StringBuffer(str);
s.reverse();
return s.toString();
}
public static String reverse01(String s) {
String s1 = "";
for (int i = s.length(); i>=0;i++) {
char c = s.charAt(i);
s1 += c;
}
return s1;
}
//字符串翻转方法
public static String reverse02(String str,int start,int end){
if(!(str != null && str.length() > 0 && start < end && end < str.length())){
throw new RuntimeException("参数不正确！");
}
char[] chars = str.toCharArray();
//临时变量
char temp = ' ';
for(int i = start,j = end;i < j; i++,j--){
temp = chars[i];
chars[i] = chars[j];
chars[j] = temp;
}
return new String(chars);
}
}