safeimmunity.java

高质量Java程序设计 源代码

package net.betterjava.design.sideeffect.immunity;
import java.util.Date;

public final class SafeImmunity {

	private final long value;
	private final Date madeDate;

	public SafeImmunity(long i, Date d) {
		value = i;
		madeDate = (Date) d.clone(); //use clone to duplicate a new Date object
	}

	public Date nextDate() {
		long l = madeDate.getTime();
		l = l + value * 24 * 60 * 60 * 1000;
		return new Date(l);
	}

	public Date getDate() {
		return madeDate;
	}

	public SafeImmunity plusPlus() {
		long i = value + 1;
		return new SafeImmunity(i, madeDate);
	}

	public SafeImmunity plus(SafeImmunity para) {
		long i = para.getValue() + value;
		return new SafeImmunity(i, madeDate);
	}

	public SafeImmunity mutliply(SafeImmunity para) {
		long i = para.getValue() * value;
		return new SafeImmunity(i, madeDate);
	}

	public long getValue() {
		return value;
	}

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