java字符串的截取方法substring()代码解析

public class StringTest {
  public static void main(String[] args) {
    String name="jason";
    System.out.println(name.substring(0,1)); //结果为j
    System.out.println(name.substring(1,2));//结果为a
    System.out.println(name.substring(0,3));
    //总结，java中String字符串下标从0开始，substring（begin，end）为[)左闭右开区间
  }
}