字符串反转//统计字符串中字符类型及频次
字符串反转
1定义一个需要反转的字符串 2把字符串转换成字符数组 3定义一个空字符串来接收反转字符串 4从后往前遍历字符串
package sy.com; public class zffanzhuan { public static void main(String[] args) { //1定义一个需要反转的字符串 String t = "HelloWorid"; //2把字符串转换成字符数组 char[] chars = t.toCharArray(); //3定义一个空字符串来接收反转字符串 String tt = ""; //4从后往前遍历字符串 for (int i = chars.length-1;i>=0;i--) { tt += chars[i]; } System.out.println("原数组是"+t); System.out.println("反转之后是"+tt); } }统计字符串中字符类型及频次
1定义一个需要反转的字符串 2把字符串转换成字符数组 3定义一个空字符串来接收反转字符串 4从后往前遍历字符串
package sy.com; public class zffanzhuan { public static void main(String[] args) { //1定义一个需要反转的字符串 String t = "HelloWorid"; //2把字符串转换成字符数组 char[] chars = t.toCharArray(); //3定义一个空字符串来接收反转字符串 String tt = ""; //4从后往前遍历字符串 for (int i = chars.length-1;i>=0;i--) { tt += chars[i]; } System.out.println("原数组是"+t); System.out.println("反转之后是"+tt); } }