运行程序,结果为以下哪个值? class Tester{ int var; Tester(double var){ this.var=(int)var; } Tester(int var){ this("hello"); } Tester(String s){ this(); System.out.println(s); } Tester(){ System.out.println("Good-bye"); } public static void main(String args[]){ Tester t = new Tester(5); } }