this关键字

package test;
class Leaf{
	int i = 0;
	//this是指向自身的引用，所以this.i是成员变量，i是形参。
	Leaf(int i){this.i = i;}
	Leaf increament(){
		i++;
		return this;
	}
	void print(){System.out.println("i="+i);}
}
public class Test {
	public static void main(String args[]){
		Leaf leaf = new Leaf(100);
		leaf.increament().increament().print();
	}
}