tree.java

Java与面向对象程序设计实验教学讲义.复数类的实现,复数类的复杂运算,身份证号码的分析,图形界面设计

import java.util.*;
class Tree
{ int height;
  Tree()   { prt("Planting a seedling"); height = 0;  }
  Tree(int i)
  { prt("Creating new Tree that is "+ i + " feet tall");
    height = i;
  }
  void info()   { prt("Tree is " + height + " feet tall");  }
  void info(String s)
  { prt(s + ": Tree is " + height + " feet tall"); }
  static void prt(String s)  { System.out.println(s);   }
}