《有些模式》- Builder

原创于 2010-10-26 09:51:55 发布 · 132 阅读

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本文介绍了一种使用Java实现的Builder模式，通过一个具体的例子展示了如何构造具有必填和可选属性的对象。这种方式不仅提高了代码的可读性，还使得创建复杂对象的过程更加清晰。

或许你已经看惯了javabean和层叠构造.

/**
 * Builder模式
 * @author Macrotea
 *
 */
public class ManFacts {
	private String name;
	private int age;
	private double height;
	private double weight;

	public static class Builder {
		// 必须
		private String name;
		private int age;
		// 可选
		private double height;
		private double weight;

		public Builder(String name, int age) {
			super();
			this.name = name;
			this.age = age;
		}

		public Builder height(double height) {
			this.height = height;
			return this;
		}

		public Builder weight(double weight) {
			this.weight = weight;
			return this;
		}

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

	private ManFacts(Builder builder) {
		this.age = builder.age;
		this.name = builder.name;
		this.height = builder.height;
		this.weight = builder.weight;
	}

}




public static void main(String[] args) {
	ManFacts manFacts=new ManFacts.Builder("macrotea", 22).height(180).weight(140).build();
}