immunity.java

高质量Java程序设计 源代码

package net.betterjava.design.sideeffect;

public final class Immunity {

	private final int value;

	public Immunity(int i) {
		value = i;
	}

	public Immunity plusPlus() {
		int i = value + 1;
		return new Immunity(i);
	}

	public Immunity plus(Immunity para) {
		int i = para.getValue() + value;
		return new Immunity(i);
	}

	public Immunity mutliply(Immunity para) {
		int i = para.getValue() * value;
		return new Immunity(i);
	}

	public int getValue() {
		return value;
	}

	public String toString() {
		return String.valueOf(value);
	}

	public static void main(String[] args) {
		Immunity i = new Immunity(0);
		Immunity j = new Immunity(0);
		Immunity factor = new Immunity(2);
		System.out.println(i.plusPlus().mutliply(factor));
		System.out.println(j.plusPlus().plus(j.plusPlus()));
	}
}