unit.java

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package com.j2medev.chapter4;
//Unit作为单位使用
public class Unit {
    
    private String[] units = new String[4];
    public static final int TEMPERATRUE = 0;
    public static final int DISTANCE = 1;
    public static final int PRESSURE = 2;
    public static final int SPEED = 3;

    public Unit() {
    }
    
    public String get(int field){
        if(field < 0 || field > 3)
            throw new IllegalArgumentException("The unit field is not defined");
        return units[field];
    }
    
    public void set(int index,String value){
        units[index] = value;
    }
    //这里调试用
    public String toString(){
        return "temperature : "+units[0]+"\n"
                +"distance : "+units[1]+"\n"
                +"pressure : "+units[2]+"\n"
                +"speed : "+units[3]+"\n";
    }
}