Java Basic(42)-ToString

1首先創建新class稱為potpie

public class potpie {

private int month;

private int day;

private int year;

public potpie(int m, int d, int y){

month = m;

day = d;

year = y;

System.out.printf("The constructor for this is %s\n", this); →使用當前對象

}

public String toString(){

return String.format("%d/%d/%d", month,day,year);

}

}

In apples.jave:

class apples{

public static void main(String args[]){

potpie potObject = new potpie(4,5,6);

}

}

這是運行時的結果：

The construtor for this is 4/5/6