JAVA代碼模組集合

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• 構造器模板

package org.effectivejava.examples.chapter02.item02.builder;public class NutritionFacts {private final int servingSize;private final int servings;private final int calories;private final int fat;private final int sodium;private final int carbohydrate;public static class Builder {// Required parametersprivate final int servingSize;private final int servings;// Optional parameters - initialized to default valuesprivate int calories = 0;private int fat = 0;private int carbohydrate = 0;private int sodium = 0;public Builder(int servingSize, int servings) {this.servingSize = servingSize;this.servings = servings;}public Builder calories(int val) {calories = val;return this;}public Builder fat(int val) {fat = val;return this;}public Builder carbohydrate(int val) {carbohydrate = val;return this;}public Builder sodium(int val) {sodium = val;return this;}public NutritionFacts build() {return new NutritionFacts(this);}}private NutritionFacts(Builder builder) {servingSize = builder.servingSize;servings = builder.servings;calories = builder.calories;fat = builder.fat;sodium = builder.sodium;carbohydrate = builder.carbohydrate;}public static void main(String[] args) {NutritionFacts cocaCola = new NutritionFacts.Builder(240, 8).calories(100).sodium(35).carbohydrate(27).build();}}

 

JAVA代碼模組集合