有关this的例子。。

public class Leaf{
 int i=0;
 Leaf(int i){this.i=i;}
 Leaf increament(){
  i++;
  return this;
  }
 void print(){System.out.println("i="+i);}
 public static void main(String[] args){
  Leaf leaf=new Leaf(100);
  Leaf leaf1 = leaf.increament();
   Leaf leaf2 = leaf1.increament();
    leaf2.print();
  }
 }