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我最近开始阅读Joshua Bloch撰写的Effective Java.我发现Builder模式的概念[书中的第2项]非常有趣.我试图在我的项目中实现它,但有编译错误.以下是我试图做的事情:

具有多个属性及其构建器类的类:

public class NutritionalFacts {
    private int sodium;
    private int fat;
    private int carbo;

    public class Builder {
        private int sodium;
        private int fat;
        private int carbo;

        public Builder(int s) {
            this.sodium = s;
        }

        public Builder fat(int f) {
            this.fat = f;
            return this;
        }

        public Builder carbo(int c) {
            this.carbo = c;
            return this;
        }

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

    private NutritionalFacts(Builder b) {
        this.sodium = b.sodium;
        this.fat = b.fat;
        this.carbo …