Java Basic(43)-Composition

public class tuna {

private String name;

private potpie birthday;

public tuna(String theName, potpie theDate){

name=theName;

birthday=theDate; →這個字符串是在potpie.java

}

public String toString(){

return String.format("My name is %s, my birthday is %s", name, birthday);

}

}

class apples{

public static void main(String args[]){

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

tuna tunaObject = new tuna("Greg",potObject);

System.out.println(tunaObject);

}

}

這是運行時的結果：

The construtor for this is 4/5/6

My name is Greg, my birthday is 4/5/6