字符串转换成相应形式问题

Question

大咖们好，请问如何将 String str = "aababc";转换成[a,a,b,a,b,c] 和{a,a,b,a,b,c}呢，先谢谢了！

Answer 1

 String s = "aababc";
String s1 = "[";
for (int i = 0; i < s.length(); i++) {
if (i > 0) s1 += ",";
s1 += s.subString(i, 1);
}
s1 += "]";