String的常用操作

1、String可以和char数组、byte数组互换

//字符串转换为字符数组或者字节数组
String s = "abc";
char[] charArr = s.toCharArray();
byte[] byteArr = s.getBytes();

//字符数组或者字节数组转换成字符串
String s1 = new String(charArr);
String s3 = String.valueOf(charArr);
String s2 = new String(byteArr);

2、字符串倒序

String s = "abc";
StringBuilder sb = new StringBuilder(s);
sb = sb.reverse();
System.out.println(sb);
//将StringBuilder转换成String
String s4= sb.toString();
String s5 = String.valueOf(sb);