class 树 {
//  树的属性
  String object;
  int age;
  int state;
//  构造方法
  树() {}
//引用树的object
  树(String object) {
//this关键字用来表示树这个类.（的）类变量（属性）object
  this.object = object；
  }
//树的引进地
  void position() {
    System.out.println(object + "position");
  }
//树的状态
  void treestate(int state) {
    if (state > 0) {
      System.out.print("," + "健康");
    }
    else {
      System.out.print("," + "需要保养");
    }
  }
//树龄
  void treeage(int age) {
    System.out.println(",树龄" + age);
  }
}
class treewutong
    extends 树 {
  int state = 1;
  int age = 6;
//创建类的构造方法，使之能进行类方法的重载
  treewutong() {}
//重载了类的方法，用来处理类对象的属性变量，这里例如object为参数表
  treewutong(String object) {
    super(object);
  }
  void position() {
    System.out.print(object + "法国引进");
//    state(state);
  }
}
class treebaiyang
    extends 树 {
  int state = 0;
  int age = 5;
  treebaiyang() {}
  treebaiyang(String object) {
    super(object);
  }
  void position() {
    System.out.print(object + "意大利引进");
  }
}
public class tree {
  public static void main(String[] args) {
   //创建类treewutong的实例 a
treewutong a = new treewutong("梧桐树");
    treebaiyang b = new treebaiyang("白杨树");
//    梧桐树的引进位子
    a.position();
//    梧桐树的状态
    a.treestate(a.state);
//    梧桐树的树龄
    a.treeage(a.age);
    b.position();
    b.treestate(b.state);
    b.treeage(b.age);
  }
}

不错。谢谢楼主分享

不错。谢谢楼主分享

谢谢大神分享

大神谢谢你的分享

大神谢谢你的分享