BuilderPattern.java

public class BuilderPattern {
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    static class Coffee {
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        private Coffee(Builder builder) {
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            this.type = builder.type;
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            this.sugar = builder.sugar;
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            this.milk = builder.milk;
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            this.size = builder.size;
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        }
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        private String type;
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        private boolean sugar;
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        private boolean milk;
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        private String size;
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        public static class Builder {
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            private String type;
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            private boolean sugar;
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            private boolean milk;
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            private String size;
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            public Builder(String type) {
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                this.type = type;
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            }
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            public Builder sugar(boolean value) {
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                this.sugar = value;
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                return this;
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            }
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            public Builder milk(boolean value) {
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                this.milk = value;
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                return this;
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            }
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            public Builder size(String value) {
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                this.size = value;
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                return this;
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            }
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            public Coffee build() {
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                return new Coffee(this);
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            }
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        }
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        @Override
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        public String toString() {
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            return String.format("Coffee [type=%s, sugar=%s, milk=%s, size=%s]", this.type, sugar, milk, size);
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        }
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    }
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    public static void main(String[] args) {
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        Coffee coffee = new BuilderPattern.Coffee.Builder("Mocha").milk(true).sugar(false).size("Large").build();
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        System.out.println(coffee);
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    }
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}