流利语法初体验

流利语法，fluent syntax，可以实现方法级联，书写起来比较优雅。

netty中也有类似写法。

public abstract class AbstractBootstrap <B extends AbstractBootstrap<B,C>,C extends Channel>

In this signature, the subclass B is a type parameter to the superclass, so that a refer- ence to the runtime instance can be returned to support method chaining (so-called fluent syntax).

假设有父类A

public class A <B extends A>{

    String name;
    int age;
    
    public String getName() {
        return name;
    }
    
    public B setName(String name) {
        this.name = name;
        return (B) this;
    }
    public int getAge() {
        return age;
    }
    public B setAge(int age) {
        this.age = age;
        return (B) this;
    }
    
    
}

假设有子类B

public class B extends A{


    public static void main(String[] args) {
        B b = new B();
        b.setAge(111).
          setName("222");//方法级联
    }
    
}