Java String substring（）方法示例。

import java.lang.*;

public class StringDemo {

   public static void main(String[] args) {

      String str = "This is tutorials point";

      String substr = "";



      // prints the substring after index 7 till index 17

      substr = str.substring(7, 17);

      System.out.println("substring = " + substr);



      // prints the substring after index 0 till index 7

      substr = str.substring(0, 7);

      System.out.println("substring = " + substr);

   }

}