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字符串转成int 类型的数组
String str ="abcdefg";
int [] arr = str.toCharArray() ;
查看一个字符串每个字符的ASCII编码 codePointAt(index)
String str ="abcdefg";
int [] arr = str.toCharArray() ;
System.out.println(str.codePointAt(0));
直接产看一个字符的ASICC编码 System.out.println((int)'c');