内部类

1.内部类定义

public class innerClazz {
    private String name ;
    private int age;
    /**
     * 每个内部类独立继承实现impl
     * 具有外部类访问权
     */
    class InnerClass{
        public InnerClass(){
            name = "cxuan";
            age = 25;
        }
    }
}

2.静态Builder模式

// 静态工厂和构造函数都可以创建对象，局限性：参数过多可读性不好
public class BuilderTest {
    private String name;

    private Double num;

    public BuilderTest(Builder builder){

    }
    public static class Builder{
        private String name;

        private Double num;

        public BuilderTest build() {
            return new BuilderTest(this);
        }
    }

    public static void main(String[] args) {
        BuilderTest builderTest = new BuilderTest.Builder()
                .build();
    }
}