设计模式之-【Builder模式】

public class Main5{

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{

private final int servingSize;

private final int servings;

private int calories = 0;

private int fat = 0;

private int sodium = 0;

private int carbohydrate = 0;

public Builder(int servingSize,int servings){
this.servingSize = servingSize;
this.servings = servings;
}

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

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

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

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

public Main5 build(){
return new Main5(this);
}
}

private Main5(Builder builder){
servingSize = builder.servingSize;
servings = builder.servings;
calories = builder.calories;
fat = builder.fat;
sodium = builder.sodium;
carbohydrate = builder.carbohydrate;
}
}