连缀用法，即是在实例化对象时，同时为对象的属性设值。
如示例所示，在创建对象时，同时调用属性的设值函数，为属性赋值
Apple apple = new Apple() .setColor("Green") .setWeight(12.3f);
实现方法是，每个设值函数都返回this
public class Apple { private String color; public Apple setColor(String color) { this.color = color; return this; } public String getColor() {return color;} private float weight; public Apple setWeight(float weight) { this.weight = weight; return this; } public float getWeight() {return weight;} }