public class StringTest
{
    public static void main(String args[])
    {   
      System.out.println("abc");
      String cde = "cde";
      System.out.println("abc" + cde);
      String c = "abc";
      c = c.substring(2,3);
      System.out.println("c = " + c);
      String d = cde.substring(1, 2);
      System.out.println("d = " + d);
    }
}
程序运行显示结果如下：
abc
abccde
c = c
d = d

public class StringTest
{
    public static void main(String args[])
    {   
      System.out.println("abc");
      String cde = "cde";
      System.out.println("abc" + cde);
      String c = "abc";
      c = c.substring(2,3);
      System.out.println("c = " + c);
      String d = cde.substring(1, 2);
      System.out.println("d = " + d);
    }
}
程序运行显示结果如下：
abc
abccde
c = c
d = d