java,Substring简单用法

public class Test_1 {public   static void   main(String[] args){String str="ab.cde.fg.";int a=str.indexOf(".");////从0开始，2int b=str.lastIndexOf(".");/////从0开始，9int len=str.length();////10System.out.println(a);System.out.println(b);System.out.println(len);String str1 = str.substring(a, b);////  2~9-1    .cde.fgSystem.out.println(str1);String str2=str.substring(a);////  .cde.fg.System.out.println(str2);String str3 = str.substring(a, str.length());////2~10-1     .cde.fg.}}