location.java

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package com.j2medev.chapter4;
//Location代表查询的位置
public class Location {
  
    private String[] location = new String[3];
    public static final int CITY = 0;
    public static final int REGION = 1;
    public static final int COUNTRY = 2;

    public Location() {
    }
    
    public String get(int field){
          if(field < 0 || field > 2)
            throw new IllegalArgumentException("The unit field is not defined");
          return location[field];
    }
    
    public void set(int index,String value){
        location[index] = value;
    }
    
    public String toString(){
        return "city : "+location[0]+"\n"
                +"region : "+location[1]+"\n"
                +"country : "+location[2]+"\n";
    }
}