如何在java中关联类？

Question

我写了时间转换程序(即秒到分钟和分钟等),但后来我发现这些类执行类似的操作.有没有办法将这些类联系起来,如果有的话请给出一些解决方案和建议.这是我的代码....

Second.java

import java.util.concurrent.*;

public class Second {

    private long secondsValue;

    public Second() {
        secondsValue = 0L;
    }

    public Second(String from, String to, long unitValue) {
        unitSelection(from, to, unitValue);
    }

    private void convertSecondToMinute(long unitValue) {
        unitValue = TimeUnit.MINUTES.convert(unitValue, TimeUnit.SECONDS);
        secondsValue = unitValue;
    }

    private void convertSecondToHour(long unitValue) {
        unitValue = TimeUnit.HOURS.convert(unitValue, TimeUnit.SECONDS);
        secondsValue = unitValue;
    }

    private void convertSecondToDay(long unitValue) {
        unitValue = TimeUnit.DAYS.convert(unitValue, TimeUnit.SECONDS);
        secondsValue = unitValue;
    }

    private void convertSecondToWeek(long unitValue) {
        unitValue = unitValue/60/60/24/7;
        secondsValue = unitValue;
    }

    public long getSeconds() {
        return secondsValue;
    }

    private void unitSelection(String from, String to,
            long unitValue) {
        if( from.equalsIgnoreCase("second")) {
            if(to.equalsIgnoreCase("minute")) {
                convertSecondToMinute(unitValue);
            }
            else if(to.equalsIgnoreCase("hour")) {
                convertSecondToHour(unitValue);             
            }
            else if(to.equalsIgnoreCase("day")) {
                convertSecondToDay(unitValue);
            }
            else if(to.equalsIgnoreCase("week") ) {
                convertSecondToWeek(unitValue);
            }
            else {
                System.out.println("Invalid argument...!");
            }
        }
    }
}

Minute.java

import java.util.concurrent.TimeUnit;

public class Minute {
    private long unitMinute;

    public Minute() {
        unitMinute = 0L;
    }
    public Minute(String from, String to,
            long unitValue) {
        unitSelection(from, to, unitValue);
    }

    private void convertMinuteToSecond(long unitValue) {
        unitValue = TimeUnit.SECONDS.convert(unitValue, TimeUnit.MINUTES);
        unitMinute = unitValue;
    }
    private void convertMinuteToHour(long unitValue) {
        unitValue = TimeUnit.HOURS.convert(unitValue, TimeUnit.MINUTES);
        unitMinute = unitValue;
    }
    private void convertMinuteToDay(long unitValue) {
        unitValue = TimeUnit.DAYS.convert(unitValue, TimeUnit.MINUTES);
        unitMinute = unitValue;
    }
    private void convertMinuteToWeek(long unitValue) {
        long value = unitValue /60/24/7;
        unitMinute = value;
    }
    public long getUnitMinute() {
        return unitMinute;
    }
    private void unitSelection(String from, String to,
            long unitValue) {
        if( from.equalsIgnoreCase("minute")) {
            if(to.equalsIgnoreCase("second")) {
                convertMinuteToSecond(unitValue);
            }
            else if(to.equalsIgnoreCase("hour")) {
                convertMinuteToHour(unitValue);             
            }
            else if(to.equalsIgnoreCase("day")) {
                convertMinuteToDay(unitValue);
            }
            else if(to.equalsIgnoreCase("week") ) {
                convertMinuteToWeek(unitValue);
            }
            else {
                System.out.println("Invalid argument...!");
            }
        }   
    }
}

Answer 1

改进代码的最佳方法是删除所有类并TimeUnit改为使用.

TimeUnit具有所有这些功能(以及更多)并随JDK一起提供.
不要重新发明轮子.