字符串中截取后几位，或从后面数第几位到第几位！
public class demo4 {public static void main(String[] args) {String str = "(P)UA000110222(S)4123222200005";//截取后四位String substring = str.substring(str.length() - 4);System.out.println("substring = " + substring);//截取后七位到后四位的字符串String substring1 = str.substring(str.length() - 7, str.length() - 4);System.out.println("substring1 = " + substring1);}
}
打印结果：
