[java]——String

初始化

//1.
String str = "hahaha";
//2.
char[] helloArray = {
    
    'h', 'e', 'l', 'l', 'o'};
String str = new String(helloArray);

获取长度

int len = str.length();

连接字符串

String s = s1 + s1;
String s = s1.concat(s2); 

子串

String sub_string = s.substring(start, end);

获取某一个位置的字符

char ss = s.charAt(idx);

其它方法:
https://www.runoob.com/java/java-string.html