java 数字字符转换成数字

//'56'必须是字符数组：char[] ch = {'5', '6'};String s = String.valueOf(ch);int i = Integer.parseInt(s);System.out.println(i);//字符的话：char ch = '5';String s = String.valueOf(ch);int i = Integer.parseInt(s);System.out.println(i);//字符串的话直接：String s = "56";int i = Integer.parseInt(s);System.out.println(i);